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  Subjects -> ENGINEERING (Total: 2358 journals)
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ENGINEERING (1240 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Hybrid Journal   (Followers: 8)
AASRI Procedia     Open Access   (Followers: 14)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 265)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 6)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 3)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 7)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 9)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 18)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 6)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 12)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 30)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 43)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 43)
Advances in Science and Research (ASR)     Open Access   (Followers: 4)
Aerobiologia     Hybrid Journal   (Followers: 2)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 35)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access   (Followers: 1)
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 26)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 10)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Antarctic Science     Hybrid Journal   (Followers: 1)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 18)
Applied Clay Science     Hybrid Journal   (Followers: 5)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 4)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 6)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 26)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Motor Trade Survey     Full-text available via subscription  
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 10)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 19)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 35)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 15)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 14)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 31)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 42)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 5)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal  
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 2)
CienciaUAT     Open Access   (Followers: 1)
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 13)
City, Culture and Society     Hybrid Journal   (Followers: 20)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 5)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 2)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 28)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Composite Structures     Hybrid Journal   (Followers: 271)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 207)
Composites Part B : Engineering     Hybrid Journal   (Followers: 246)
Composites Science and Technology     Hybrid Journal   (Followers: 182)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 15)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
Computer Science and Engineering     Open Access   (Followers: 19)
Computers & Geosciences     Hybrid Journal   (Followers: 30)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 8)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 5)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 33)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 9)
Control Engineering Practice     Hybrid Journal   (Followers: 43)
Control Theory and Informatics     Open Access   (Followers: 8)
Corrosion Science     Hybrid Journal   (Followers: 25)

        1 2 3 4 5 6 7 | Last

Journal Cover Computers and Geotechnics
  [SJR: 2.033]   [H-I: 58]   [11 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0266-352X
   Published by Elsevier Homepage  [3176 journals]
  • Parametric study of smooth joint parameters on the mechanical behavior of
           transversely isotropic rocks and research on calibration method
    • Authors: Lei Xia; Yawu Zeng
      Pages: 1 - 7
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Lei Xia, Yawu Zeng
      This paper aims to study the relationships between microscopic parameters of bedding planes and macroscopic characteristic of transversely isotropic rock using the bonded-particle discrete element models. The bedding planes were simulated by embedding smooth joint models within an area of certain thickness. A macro-microscopic parameters calibration method for transversely isotropic rocks was designed, which was able to adequately capture the essential anisotropic features of transversely isotropic rocks. Verification was conducted by taking Boryeong shale as an example to build the discrete element model and calibrate the parameters. The results were compared, demonstrating the accuracy and superiority of the calibration method.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.01.012
      Issue No: Vol. 98 (2018)
  • Short soil–binder columns in railway track reinforcement:
           three–dimensional numerical studies considering the train–track
    • Authors: André Francisco; André Paixão; José Nuno Varandas; Eduardo Fortunato
      Pages: 8 - 16
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): André Francisco, André Paixão, José Nuno Varandas, Eduardo Fortunato
      The authors present a numerical study on railway track subgrade reinforcement using short soil-binder columns through injection, below the ballast layer. A 3D FEM program developed in MATLAB that considers the dynamic train–track interaction and the non-linear elastic behaviour of the ballast is used to study the response of the train–track–substructure system and assess stresses in the subgrade. Results suggest that reinforcements have limited impact on the train–track interaction and reduce deviatoric stresses between columns, at the top of the foundation. This method may be particularly relevant in the rehabilitation of old single railway tracks.
      Graphical abstract image

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.02.001
      Issue No: Vol. 98 (2018)
  • Simulating the behaviour of reactive soils and slab foundations using
           hydro-mechanical finite element modelling incorporating soil suction and
           moisture changes
    • Authors: Mohamed A. Shams; Mohamed A. Shahin; Mostafa A. Ismail
      Pages: 17 - 34
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Mohamed A. Shams, Mohamed A. Shahin, Mostafa A. Ismail
      The main objective of this paper is to enhance the current design practice of stiffened slab foundations on reactive soils through an advanced numerical modelling study. The paper presents sophisticated three-dimensional (3D) hydro-mechanical finite element (FE) numerical models using coupled flow-deformation and stress analyses capable of simulating the complex behaviour of reactive soils and slab foundations. The decisive parameters of the developed FE models are described in detail and the modelling efficacy is verified through three case studies. The ability of the FE models to simulate the moisture diffusion and suction variations in relation to climate changes is validated through two case studies involving field observations. A third case study involving a hypothetical stiffened slab foundation on reactive soil is used for comparison with one of the traditional design methods. The developed FE models are found to perform well and overcome some of the most significant limitations of available traditional methods, leading to more reliable design outputs.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.01.013
      Issue No: Vol. 98 (2018)
  • Dynamic analysis with flat-top partition of unity-based discontinuous
           deformation analysis
    • Authors: Xiaoying Liu; Zhiye Zhao
      Pages: 35 - 47
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Xiaoying Liu, Zhiye Zhao
      The flat-top partition of unity method can obtain a stiffness matrix with a small condition number and avoid the linear dependence problem. We aimed to extend the flat-top partition of unity method to rock dynamic analyses to simulate the influence of discontinuity and dynamic loading. Therefore, the flat-top partition of unity method was coupled with the discontinuous deformation analysis. In this paper, after the presentation of the mesh construction, the inertia force and contact algorithm for flat-top partition of unity-based discontinuous deformation analysis, several numerical examples are presented to verify the accuracy and efficiency of the method.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.01.019
      Issue No: Vol. 98 (2018)
  • A numerical homogenization study of the elastic property of a soil-rock
           mixture using random mesostructure generation
    • Authors: Q.X. Meng; H.L. Wang; W.Y. Xu; M. Cai
      Pages: 48 - 57
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Q.X. Meng, H.L. Wang, W.Y. Xu, M. Cai
      A random generation method of periodic mesostructures of soil-rock mixtures based on random polygon is proposed and used in the generation of an RVE model. A code for generating a periodic mesh and periodic boundary is developed for the numerical simulation. Macroscopic elastic parameters of the SRMs are calculated based on the simulation using numerical homogenization. The elastic modulus shows a size effect, namely, the modulus deceases gradually with an increase in the model size. The border effect is related to the model size and is large in small-sized models. Rock aggregates arranged in a certain direction induce property anisotropy.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.01.015
      Issue No: Vol. 98 (2018)
  • Simulation of wormhole propagation in fractured carbonate rocks with
           unified pipe-network method
    • Authors: Yun Chen; Guowei Ma; Tuo Li; Yang Wang; Feng Ren
      Pages: 58 - 68
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Yun Chen, Guowei Ma, Tuo Li, Yang Wang, Feng Ren
      The 3D Unified Pipe-Network Method (UPM) is applied to simulate the acidizing process in fractured carbonate rock. Fractures and porous media are represented by their equivalent connected fracture pipes and matrix pipes, respectively. The UPM combined with a two-scale continuum model is a numerical approach to wormhole development. Benchmark tests are attempted against commercial software and a sensitivity analysis is carried out with respect to the rock porosity heterogeneity magnitude and injection rates. The influences of the geometric properties and permeability of a fracture on wormhole propagation and the amount of reaction fluid per pore volume required to reach a breakthrough (PVBT) are analysed.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2017.11.009
      Issue No: Vol. 98 (2018)
  • A coupled hydro-mechanical constitutive model for unsaturated frictional
           and cohesive soil
    • Authors: Esmaeel Gholizadeh; Manoucher Latifi
      Pages: 69 - 81
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Esmaeel Gholizadeh, Manoucher Latifi
      The present study has developed a constitutive model for both saturated and unsaturated soils. The model considers the effect of mechanical and hydraulic loading on the soil behavior in critical state framework. The mechanical part has separate mechanisms, deviatoric mechanism taking advantage of multi-yield surface plasticity, and isotropic mechanism with classical plasticity formulation. The water retention part is based on the bounding surface concept. Comparison of experimental data and model predictions for saturated and unsaturated states in frictional and cohesive soils, validates the model performance considering soil behavior under different drainage and loading conditions by using one set parameters.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2017.11.010
      Issue No: Vol. 98 (2018)
  • 3D numerical investigation of the effect of wall penetration depth on
           excavations behavior in sand
    • Authors: Mohammad Bahrami; Mohammad Iman Khodakarami; Abdolhosein Haddad
      Pages: 82 - 92
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Mohammad Bahrami, Mohammad Iman Khodakarami, Abdolhosein Haddad
      The present paper evaluates the effect of penetration depth of a diaphragm wall on the behavior of excavations in sandy soils using the finite difference method. A three-dimensional (3D) modeling is performed for excavation depths of 10 to 20 m. The analysis reveals the safe values of penetration depth for designing a diaphragm wall. Furthermore, the evaluations undertaken in the present paper indicate that the two-dimensional (2D) modeling to depths of 10 m is associated with large errors. In addition, the evaluation of the validity of the traditional method for the design of a steel strut has been discussed.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.02.009
      Issue No: Vol. 98 (2018)
  • Analysis of an axially loaded pile in saturated multi-layered soils with
           anisotropic permeability and elastic superstrata
    • Authors: Zhi Yong Ai; Pan Cong Li; Xiaoyu Song; Ben Kai Shi
      Pages: 93 - 101
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Zhi Yong Ai, Pan Cong Li, Xiaoyu Song, Ben Kai Shi
      This paper proposes a coupling method to study the effect of overlying single-phase soils and the time-dependent response of an axially-loaded pile in saturated multi-layered soils. The analytical layer-element theory is employed to obtain the flexibility matrices of soils, and then 1D FEM is used to derive the stiffness matrix equation of a single pile. The solutions for pile-soil interaction are achieved by incorporating the compatibility condition between the pile and soil media. Several examples are presented to examine the impact of the stratification, pile-soil stiffness ratio, interfacial permeability and consolidation time on the behaviour of a single pile foundation.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.02.004
      Issue No: Vol. 98 (2018)
  • A novel constitutive model for geomaterials in hyperplasticity
    • Authors: Zhenguo Zhang; Yongqiang Chen; Zhuping Huang
      Pages: 102 - 113
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Zhenguo Zhang, Yongqiang Chen, Zhuping Huang
      This paper proposes a new constitutive model for geotechnical materials that consists two basic constitutive functions, the free energy function and the dissipation rate function, within the framework of hyperplastic theory. This free energy function is capable of describing the pressure-dependent elastic behavior of soils. The new constructed dissipation rate function accounts for the frictional mechanism of energy dissipation. Based on this dissipation rate function, the non-associated flow rule can be obtained. Furthermore, the convexity of the yield surface that is derived from the dissipation rate function is proved. Predictions of the behavior of a soil sample using this new constitutive model agree well with triaxial test data under drained and undrained conditions.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.01.017
      Issue No: Vol. 98 (2018)
  • Particle mechanics modeling of the effect of aggregate shape on creep of
           durable rockfills
    • Authors: Yunjia Wang; Er-xiang Song; Zhihong Zhao
      Pages: 114 - 131
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Yunjia Wang, Er-xiang Song, Zhihong Zhao
      The role of aggregate shapes in creep of durable rockfills is investigated using particle mechanics method. Both one-dimensional compressional creep and direct shear creep tests are performed on numerical rockfills consisting of rounded or irregular aggregates. Under one-dimensional compression, the creep displacements of irregular samples were greater than rounded samples. Under direct shear, the creep displacements of rounded samples could be the same magnitudes of or even larger than irregular samples. A concept of key aggregates is proposed to explain the evolution of force chains in rockfills. The different creep behavior of wet rounded and irregular aggregates is briefly discussed.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.02.013
      Issue No: Vol. 98 (2018)
  • Implementation of a model of elastoviscoplastic consolidation behavior in
           Flac 3D
    • Authors: Verónica M. Giraldo Zapata; Eduardo Botero Jaramillo; Alexandra Ossa Lopez
      Pages: 132 - 143
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Verónica M. Giraldo Zapata, Eduardo Botero Jaramillo, Alexandra Ossa Lopez
      The implementation of an elastoviscoplastic three-dimensional model (EVP3D) with the finite difference method is presented using the Flac3D analysis platform. This numerical model allows the time-dependent stress-strain behavior of soil to be studied while incorporating its viscous characteristics. An algorithm for solving the constitutive equations is developed and programmed using the centered finite difference method varying in time. The historical case of the construction of Tarsuit Island in the Beaufort Sea in the Arctic Ocean is studied to calibrate and validate the model. A finite difference model that represents the construction stages is developed, and the short- and long-term behaviors are obtained. The model was calibrated and validated with the data record from an electric piezometer that was installed in the foundation of the artificial island, and the results of the algorithm are compared with the recorded data. The results are satisfactory and comparable to the measurements that were recorded for a year on the island, which demonstrates the applicability and validity of the model and its constitutive hypotheses.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2017.11.011
      Issue No: Vol. 98 (2018)
  • Reliability analysis of tunnels using an adaptive RBF and a first-order
           reliability method
    • Authors: Qian Wang; Hongbing Fang
      Pages: 144 - 152
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Qian Wang, Hongbing Fang
      A new reliability analysis method for tunnels was developed by integrating an adaptive Radial Basis Function (RBF) metamodeling technique with a First-Order Reliability Method (FORM). In each iteration of the adaptive RBF (A-RBF) technique, an explicit metamodel of the performance function was constructed using an augmented RBF, before an alternate FORM was applied. Additional sample points were then added in the neighborhood of the design point in order to improve the accuracy of the metamodel. Three examples were solved and the proposed approach worked well. This work provides an efficient and effective reliability analysis method for practical tunnel engineering problems.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.02.011
      Issue No: Vol. 98 (2018)
  • Classification and characteristics of soil arching structures in
           pile-supported embankments
    • Authors: Han-Jiang Lai; Jun-Jie Zheng; Rong-Jun Zhang; Ming-Juan Cui
      Pages: 153 - 171
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Han-Jiang Lai, Jun-Jie Zheng, Rong-Jun Zhang, Ming-Juan Cui
      Soil arching effect is a key load-transfer component in pile-supported embankments. However, previous models that account for soil arching effect consider various assumptions and simplifications due to insufficient understanding of soil arching structures developed in pile-supported embankments. Consequently, the use of previous models in practice would potentially result in substantially different designs. This study aims to develop a reasonable classification system for the soil arching structures under different conditions, and to identify the characteristics and applicability of each structure. Firstly, a series of Discrete Element Method simulations were performed to investigate the evolution of soil arching structures under different conditions with emphasis on the embankment deformation behaviour. The simulation results show that soil arching structures under different conditions can be divided into three groups: (a) “shear plane arching”; (b) “partial arching”; and (c) “full arching”. This was followed by detailed analysis of the macro- and microscopic characteristics of each soil arching structure. Finally, the load-transfer mechanisms of the three soil arching structures are compared, and the influence of design parameters on the soil arching structure is discussed. It is concluded that contact force rotation induced by the pile-subsoil relative displacement causes the changes in load-transfer path, and thus the stress distribution is altered. However, the interaction and location of the rotated contact forces are considerably different under different conditions, which results in the development of various soil arching structures and significant differences in the deformation and the load-transfer mechanism of the pile-supported embankments. Two critical heights that govern the interaction and location of the rotated contact forces were identified: the critical arching height, h ca (i.e., 0.8(s-a)), and the critical overlying filling height, h co (i.e., 3.0a), where s is the pile spacing and a is the pile (or pile cap) width. It was shown that, for the design of the pile-supported embankments, both (s-a) and a should be considered.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.02.007
      Issue No: Vol. 98 (2018)
  • Effective stress-based upper bound limit analysis of unsaturated soils
           using the weak form quadrature element method
    • Authors: Shuai Yuan; Jingna Du
      Pages: 172 - 180
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Shuai Yuan, Jingna Du
      Limit analysis methods can be used to directly calculate the bearing capacities of earth structures. Currently, there are very few studies on the limit analysis of unsaturated soils, which are widely distributed in geotechnical engineering. In the present paper, a kinematic theorem of unsaturated soils is established with a unified effective stress employed to represent the matric suction relied shear strength. Numerical solutions of the formulation are obtained by the weak form quadrature element method in combination with the second-order cone programming. Some tests are described, and the effect of suction stress is discussed in detail.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.02.008
      Issue No: Vol. 98 (2018)
  • Micro mechanics of the critical state line at high stresses
    • Authors: John P. de Bono; Glenn R. McDowell
      Pages: 181 - 188
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): John P. de Bono, Glenn R. McDowell
      A critical state line is presented for a crushable numerical soil, which is parallel to the isotropic normal compression line. A previous theory for the normal compression line, which correctly predicts the slope as a function of the size-effect on particle strength is extended to justify the slope of the critical state line. The micro mechanics behind critical states are examined, leading to a theory for a relationship between the volume of smallest particles and mean effective stress. A unique relationship exists for crushed states, leading to a two-dimensional interpretation of the state boundary surface for soils looser than critical.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.02.016
      Issue No: Vol. 98 (2018)
  • Upper bound solutions for face stability of circular tunnels in
           non-homogeneous and anisotropic clays
    • Authors: Maosong Huang; Zhen Tang; Weixiang Zhou; Juyun Yuan
      Pages: 189 - 196
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Maosong Huang, Zhen Tang, Weixiang Zhou, Juyun Yuan
      This paper presents a three-dimensional stability analysis of a circular tunnel face in non-homogeneous and anisotropic undrained clay using the kinematic approach (upper bound) of limit analysis. The proposed failure mechanism consists of a cylindrical rigid block and a toroidal shear zone with variable radius, and the closed-form analytical expressions of velocity field are derived within the framework of an orthogonal curvilinear coordinate system. The critical collapse-supporting pressure and stability ratio are obtained through optimization with respect to the geometrical parameters of the mechanism. Two types of non-homogeneous undrained strength, linearly changing with depth, and two-layer clays with constant undrained strength are investigated. Meanwhile, the 3-D finite element analysis is employed to validate the proposed failure mechanism. The upper bound solutions of the stability ratio of the proposed mechanism compare reasonably well with the upper bound solutions from the finite element analysis and show significant improvements over the existing upper bound solutions in single layer clays with homogeneous and isotropic undrained strength. The results show that the critical collapse pressure decreases with the increase in the non-homogeneous ratio and the anisotropic ratio and increases with the ratio between the undrained strength of the top layer and of the bottom layer.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.02.015
      Issue No: Vol. 98 (2018)
  • Minimum time-step size in transient finite element analysis of coupled
           poromechanical problems
    • Authors: Wentao Li; Changfu Wei
      Pages: 197 - 204
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Wentao Li, Changfu Wei
      Finite element solution of poromechanical problems often exhibits oscillating pore pressures, if the time step is small relative to the spatial grid size. Here the nonphysical oscillations in the pore pressure are investigated and a novel analytical approach is presented, which satisfies the non-oscillatory criteria for compressible porous medium modeling. With the consistent and the lumped finite element schemes considered, the time-step constraints for three different types of one-dimensional elements are derived in terms of the mesh size and the material properties of both mechanics and seepage. Numerical examples are simulated to illustrate the obtained theoretical results.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.02.012
      Issue No: Vol. 98 (2018)
  • A fast method for fracture intersection detection in discrete fracture
    • Authors: Shaoqun Dong; Lianbo Zeng; Peter Dowd; Chaoshui Xu; Han Cao
      Pages: 205 - 216
      Abstract: Publication date: June 2018
      Source:Computers and Geotechnics, Volume 98
      Author(s): Shaoqun Dong, Lianbo Zeng, Peter Dowd, Chaoshui Xu, Han Cao
      The detection of fracture intersections is an important topic in discrete fracture network modelling for assessments such as connectivity analysis and subsequent fluid flow evaluations. However, the standard method for such detection is very time-consuming especially for large fracture networks as the detection time often increases exponentially with the number of fractures in the network. In this paper, we introduce the bounding box and sweeping line (BBSL) method as a new fast algorithm to solve the problem. BBSL comprises two consecutive steps: filtering and refining. In the filtering step, an axis-aligned minimum bounding box (AABB) and an improved sweeping line method (SLR – sweeping line for rectangles in 2D or SLC – sweeping line for cuboids in 3D) are introduced to filter out pairs of fractures that have no possibility of intersection. The proposed refining in BBSL consists of coarse refining and fine refining. Coarse refining combines the inner and outer products of vectors to filter out non-intersecting pairs of fractures. Fine refining is then used to further assess fracture intersections and to determine the intersection coordinates. To demonstrate the application of the proposed method a series of comparison experiments were conducted using 2D and 3D discrete fracture networks with different fracture densities. For filtering, the results show that the proposed method is significantly more efficient than the commonly used methods such as brute force (BF) and sweeping and pruning (SAP). For refining, the proposed method significantly outperforms the commonly used refining method.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.02.005
      Issue No: Vol. 98 (2018)
  • Buckling of tapered friction piles in inhomogeneous soil
    • Authors: Joon Kyu Lee; Sangseom Jeong; Youngho Kim
      Pages: 1 - 6
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Joon Kyu Lee, Sangseom Jeong, Youngho Kim
      In this paper, an analytical model is developed to estimate the buckling behavior of tapered friction piles fully embedded in inhomogeneous soil. The governing differential equation of the problem is derived with associated boundary conditions and is solved by using the Runge-Kutta method in combination with the Regula-Falsi method. Numerical examples for calculated buckling loads and buckled shapes are given to highlight the introduction of dimensionless variables related to the tapering and shaft friction of the pile, soil inhomogeneity and pile-soil stiffness as well as the degrees of freedom at the both ends of the pile.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2017.12.012
      Issue No: Vol. 97 (2018)
  • Uplift Resistance of Buried Pipelines in Partially Saturated Sands
    • Authors: D.J. Robert; N.I. Thusyanthan
      Pages: 7 - 19
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): D.J. Robert, N.I. Thusyanthan
      High Pressure and High Temperature (HPHT) oil and gas pipelines are commonly buried subsurface and the depth of burial is determined by upheaval buckling mitigation requirement or legislation requirement. The upheaval buckling mitigation design requires evaluation of uplift resistance of soil in which pipeline is buried. Conventional design guidelines and current analytical models for predicting the soil uplift resistance are based on either dry soil or fully saturated soil. However, onshore pipeline are buried in soils which are often partially saturated. Therefore, current analytical models do not capture the effects of soil saturation on the uplift resistance of buried pipeline. In partially saturated soils, the uplift resistance is greater than that under fully saturated conditions. This is because the water meniscus between soil particles creates an additional normal force due to suction, which in turn makes the soil behaviour stiffer and stronger. This paper presents full scale pipe-soil tests results and finite-element parametric studies conducted to investigate the effects of soil moisture content, dimensionless cover heights (soil cover height to diameter ratio) and soil relative density on the peak uplift resistance of pipes. The results demonstrate that the current available analytical models under-predict the soil peak uplift resistance in partially saturated conditions. Further, the analyzed results are presented as dimensionless design charts and non-linear regression models which can be used to quantify the partial saturation effect on uplift resistance of buried pipes.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2017.12.010
      Issue No: Vol. 97 (2018)
  • Impact of fluid compressibility for plane strain hydraulic fractures
    • Authors: Di Wang; Mian Chen; Yan Jin; Andrew P. Bunger
      Pages: 20 - 26
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Di Wang, Mian Chen, Yan Jin, Andrew P. Bunger
      Growing interest in hydraulic fracturing (HF) using super-critical CO2 (SC-CO2) calls into question the typical HF modeling assumption whereby the fluid compressibility is neglected. This paper models a plane strain HF driven by compressible fracturing fluid including the influence of viscous fluid flow, crack propagation through the host rock, and fluid leakoff into the host rock. The results show that, contrary to a reasonable initial hypothesis that compressibility would be important, in expected real world conditions the fluid compressibility has little impact on fracture propagation.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2017.12.009
      Issue No: Vol. 97 (2018)
  • Dependence of ultimate bearing capacity and failure behavior of T-shaped
           deep cement mixing piles on enlarged cap shape and pile strength
    • Authors: Chana Phutthananon; Pornkasem Jongpradist; Phatharaphong Yensri; Pitthaya Jamsawang
      Pages: 27 - 41
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Chana Phutthananon, Pornkasem Jongpradist, Phatharaphong Yensri, Pitthaya Jamsawang
      A numerical investigation of the ultimate pile capacity ( Q ult ) and failure behavior of T-shape deep cement mixing (TDM) piles is conducted under equivalent volume. Physical model tests are conducted to verify the numerical findings. The results reveal that both the shape of the enlarged pile cap and pile strength play key roles. Sensitivity analyses indicate that the effects of cap shape and pile strength on the complex load carrying behavior of TDM piles are attributable to changes in failure mode, which depend on the mobilized skin friction and bearing of both the cap and pile body.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2017.12.013
      Issue No: Vol. 97 (2018)
  • Reliability-based design of tunnelling problems and insights for Eurocode
    • Authors: Huaxin Liu; Bak Kong Low
      Pages: 42 - 51
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Huaxin Liu, Bak Kong Low
      The partial factor design approach has been suggested to replace the factor of safety design in geotechnical practice, such as the Eurocode 7 (EC7) for European countries and the load and resistance factor design (LRFD) for the North America. However, these design codes cover little about rock engineering principles and rock engineers struggle with the application of the partial factor design to rock engineering problems. This paper presents how reliability-based design (RBD) can provide insights to and help the evolution of the partial factor design approach for tunnelling problems. Compared with other reliability methods, the first-order reliability method (FORM) is consistent for different but mathematically equivalent limit state functions. The intuitive expanding ellipsoid perspective and the constrained optimization method for FORM help overcome the conceptual and computational barriers for practitioners. Three case studies are presented to show that RBD via FORM can determine the role (resistance or load factor) of input parameters on a case-by-case basis in ways that prescribed partial factors cannot, including a symmetrical roof wedge above a tunnel, a lined circular tunnel under non-hydrostatic in situ stresses and a circular tunnel reinforced by rockbolts considering multiple failure modes.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2017.12.005
      Issue No: Vol. 97 (2018)
  • FOSM-based shear reliability analysis of CSGR dams using strength theory
    • Authors: Jinsheng Jia; Sha Wang; Cuiying Zheng; Zuping Chen; Yang Wang
      Pages: 52 - 61
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Jinsheng Jia, Sha Wang, Cuiying Zheng, Zuping Chen, Yang Wang
      The cemented sand, gravel and rock (CGSR) dam is a new type of dam that combines the characteristics of a rigid dam and an embankment dam. Mechanical tests show that the shear strength of CSGR is much lower than that of concrete and present significant discreteness; shear failure of a CSGR dam is more similar to a failure in material than a failure along the contact between two materials and is quite different from the failure of a rigid dam. The rigid equilibrium method (REM), which adopts the parameters φ and C, could cause great calculation error when applied to the stability evaluation of a CSGR dam. Because of the uncertainty of the shearing parameters, reliability theory should be used to analyze the shearing stability of CSGR dams. In this study, shear criteria based on the theories of Mohr Coulomb and double-shear strength failure and the corresponding limit state equations using uniaxial compressive and tensile strength as random variables are proposed to evaluate the shearing stability of CSGR dams; then, the reliability index of above limit state equations is solved using the reliability method of first-order second moment (FOSM) combined with the finite element method; the failure probability can thus be evaluated on a local scale. The FOSM-based method proposed in this study is applied to the case study of Shou Koubao Dam. The conclusions drawn from the results will contribute to the risk analysis of CSGR dams in the future.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2018.01.003
      Issue No: Vol. 97 (2018)
  • Development of new prediction model for capacity of combined pile-raft
    • Authors: Ashutosh Kumar; Deepankar Choudhury
      Pages: 62 - 68
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Ashutosh Kumar, Deepankar Choudhury
      The complex soil-structure interaction factors to estimate load bearing capacity of a combined pile-raft foundation (CPRF) is scarce. A new prediction method is proposed to estimate both Ultimate Limit State (ULS) and Serviceability Limit State (SLS) bearing capacity of CPRF by evaluating the pile-raft and raft-pile interaction factors. The developed model is validated with available experimental results. The simplified expressions for the evaluation of load-sharing ratio and a mobilized factor of safety of CPRF considering the serviceability requirement of the structure are also proposed. It provides a simple design solution for CPRF subjected to vertical loading condition.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2017.12.008
      Issue No: Vol. 97 (2018)
  • A design scheme for geocell-reinforced foundations based on the lower
           bound limit analysis method
    • Authors: Mohammad Reza Arvin; Zahra Beigi
      Pages: 69 - 77
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Mohammad Reza Arvin, Zahra Beigi
      Results of laboratory tests on geocell-reinforced soils indicate negligible change in the internal friction angle and development of an apparent cohesion. If sufficient apparent cohesion to withstand applied loads on foundations can be determined, then a suitable kind of soil-geocell composite may be selected among pretested ones by laboratory means. In the present study, using numerical methods of lower bound limit analysis, the required apparent cohesion in the geocell layer to bear the applied load on strip foundations has been determined by back analysis. Effects of contributing factors were evaluated on the results for single and double layer reinforcements.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2018.01.001
      Issue No: Vol. 97 (2018)
  • Influence of model type, bias and input parameter variability on
           reliability analysis for simple limit states with two load terms
    • Authors: Sina Javankhoshdel; Richard J. Bathurst; Brigid Cami
      Pages: 78 - 89
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Sina Javankhoshdel, Richard J. Bathurst, Brigid Cami
      A general closed-form solution to compute the reliability index of a simple limit state function with two load terms and one resistance term is derived. The formulation considers contributions to margins of safety expressed in probabilistic terms due to the choice of load and resistance models, bias values, dependencies between nominal values and bias, uncertainty in estimates of nominal values for uncorrelated load and resistance terms at time of design, and average margin of safety expressed as the operational factor of safety. A sensitivity analysis and example application demonstrate the quantitative influence of the contributing random variables on reliability index.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2018.01.002
      Issue No: Vol. 97 (2018)
  • Three-dimensional discrete element analysis of triaxial tests and wetting
           tests on unsaturated compacted silt
    • Authors: Tao Li; Mingjing Jiang; Colin Thornton
      Pages: 90 - 102
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Tao Li, Mingjing Jiang, Colin Thornton
      Three-dimensional DEM (discrete element method) simulations of triaxial tests and wetting tests on unsaturated silt were carried out in order to analyse the macro and microscopic behaviour under triaxial stress conditions. Interparticle adhesive forces were incorporated into a rolling and twisting resistance model to represent the van der Waals and capillary forces. A loose DEM sample was first produced considering rolling and twisting resistance and van der Waals forces to sustain an open structure. A series of pseudo-constant water content triaxial tests were simulated by controlling adhesive forces at contacts using the matric suction and a group of representative soil-water characteristic curves. The wetting tests were performed by quickly and gradually wetting (QW and GW) the unsaturated sample at different deviator stress levels. By introducing adhesive forces at contacts, the simulation reproduces the main mechanical behaviour. In the triaxial tests, Z m (mechanical coordination number) for the unsaturated sample increases rapidly during shear until becoming approximately constant. The induced structural anisotropy (under deviatoric loading) reduces with decrease in water content due to the higher interparticle adhesive forces. In the gradual wetting tests, the deviatoric fabric increases gradually during wetting. The deviator strains induced by QW and GW (loading-wetting sequence) are much larger than for the saturated sample at the same stress state in triaxial tests (wetting-loading sequence).

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2017.12.011
      Issue No: Vol. 97 (2018)
  • Upper-bound stability analysis of dual unlined horseshoe-shaped tunnels
           subjected to gravity
    • Authors: Jian Zhang; Tugen Feng; Junsheng Yang; Feng Yang; Yufeng Gao
      Pages: 103 - 110
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Jian Zhang, Tugen Feng, Junsheng Yang, Feng Yang, Yufeng Gao
      This study investigates the stability of dual horseshoe-shaped tunnels in cohesive-frictional soils subjected to gravity using an upper-bound finite element method combined with a plastic-dissipation-based mesh adaptive strategy. The results are presented in the form of dimensionless stability numbers, which decrease with C/D and increase with ϕ. The results indicate that the interaction between dual horseshoe-shaped tunnels disappears when their dimensionless center-to-center distance S/D lies approximately in any of the following ranges for C/D: (i) 3.5–4.5 for C/D = 1, (ii) 3.5–6.5 for C/D = 2, (iii) 3.5–9 for C/D = 3, (iv) 4–11 for C/D = 4, and (v) 4–13.5 for C/D = 5.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2018.01.006
      Issue No: Vol. 97 (2018)
  • A high-order local artificial boundary condition for seepage and heat
    • Authors: Shuang Luo; Erxiang Song
      Pages: 111 - 123
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Shuang Luo, Erxiang Song
      A high-order local artificial boundary condition (ABC) with a new approximation scheme is proposed for numerical analyses of seepage and heat transfer in unbounded domains. The proposed ABCs are first derived for a one-dimensional case and then extended to high-dimensional cases and transversely isotropic media. In the derivation, the irrational function in Laplace space with respect to time is approximated through numerical integration. The calculations show that the proposed ABCs provide more satisfactory results than those obtained by using existing approximation methods, especially for long-duration simulations. Moreover, the relation among the calculation accuracy, approximation order, and diffusivity is also investigated.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2018.01.008
      Issue No: Vol. 97 (2018)
  • Undrained stability of strip footing above voids in two-layered clays by
           finite element limit analysis
    • Authors: Yao Xiao; Minghua Zhao; Heng Zhao
      Pages: 124 - 133
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Yao Xiao, Minghua Zhao, Heng Zhao
      Finite element limit analysis (FELA) is used to study the undrained bearing capacity of strip footing above voids in two-layered clays. Based on the FELA results, design charts and equations are provided to calculate the undrained bearing capacity factor Ns . The impact of parameters on Ns also has been investigated, including undrained shear stress ratio of the soil, thickness of the top layer, location, size, width, height and spacing of the voids. The failure mechanisms for a single void maybe classified into three categories: roof failure, combined roof and wall failure, bearing failure without void failure.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2018.01.005
      Issue No: Vol. 97 (2018)
  • A simplified approach to transient flow effects induced by rigid cylinder
           rotation in a porous medium
    • Authors: G. Dienstmann; F.S. de Almeida; A. Fayolle; F. Schnaid; S. Maghous
      Pages: 134 - 154
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): G. Dienstmann, F.S. de Almeida, A. Fayolle, F. Schnaid, S. Maghous
      Drainage conditions associated with loading rate effects during rotation of elements embedded in intermediate permeability soils are fundamental factors in the assessment and analysis of in situ measured properties and foundation design systems. In that context, a simplified model for poromechanical analysis of consolidation induced by rotation of a rigid cylinder embedded within a porous medium is formulated. The approach is closely connected with the concept of deformation plasticity and relies upon the equivalence between the local behavior of a poroplastic material under monotonic loading process and that of an appropriate non-linear fictitious poroelastic behavior. The non-linear poroelastic model is conceived to capture the transient flow effects on the poromechanical response of the soil surrounding the rotating cylinder. Semi-analytical solutions are derived for pore-fluid pressure, displacement and stress distributions, allowing for the evaluation of rate effects in silty soils, with specific application to purely cohesive and frictional materials. The accuracy of the approach is assessed by comparison of model predictions with poroplastic finite element solutions. The results correlating the degree of drainage to normalized rotation velocity derived from proposed model may be a useful support for a wide range of geotechnical applications, such as laterally loaded rigid piles with rotationally pile connections, offshore wind turbines shafts subjected to torque or torsional vibration, rotation of shaft drilling tools and in situ tests subjected to shear.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2017.11.014
      Issue No: Vol. 97 (2018)
  • An Efficient FE model for SSI: Theoretical background and assessment by
           predicting the response of large diameter monopiles supporting OWECs
    • Authors: Lalahoum Otsmane; Djillali Amar Bouzid
      Pages: 155 - 166
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Lalahoum Otsmane, Djillali Amar Bouzid
      An efficient technique called NVSM (Nonlinear Vertical Slices Model) for analyzing soil/structure interaction (SSI) problems is presented. This procedure approximates a full 3D problem into a series of 2D vertical interacting panels which can be solved using a standard 2D FE discretization, while allowing the slices interaction to be accounted for using the finite difference method. Duncan-Chang basic soil model is described first since it is simple to implement in a computer code, then, the extension of the VS Model to deal with nonlinear problems is detailed and supported by a flowchart giving the necessary steps of stress computations. The written Fortran computer code for predicting the response of large diameter monopiles supporting OWTs under combined loading is assessed against three case studies in which the authors used independently powerful commercial packages to study this kind of foundations embedded in offshore subsoils formed mostly of dense sand. An excellent agreement between the present predictions and those of the other numerical codes has been obtained.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2017.12.001
      Issue No: Vol. 97 (2018)
  • On the micro mechanics of yielding and hardening of crushable granular
    • Authors: John P. de Bono; Glenn R. McDowell
      Pages: 167 - 188
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): John P. de Bono, Glenn R. McDowell
      Stress path tests are used to investigate the yield surface of a crushable numerical soil. Triaxial samples with isotropic and anisotropic stress histories are examined to determine the nature of the yield surface and to establish what governs yield. Two separate yield surfaces are exposed: a shear yield surface at low p′ and high η which is governed by minor breakage of fine particles, and a compressive yield surface at high p′ and low η, governed by bulk breakage across all particle sizes. The shear yield surface is dependent on stress history, whilst the compressive yield surface is isotropic.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2018.01.010
      Issue No: Vol. 97 (2018)
  • A machine learning approach to energy pile design
    • Authors: Nikolas Makasis; Guillermo A. Narsilio; Asal Bidarmaghz
      Pages: 189 - 203
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Nikolas Makasis, Guillermo A. Narsilio, Asal Bidarmaghz
      Incorporating ground heat exchangers (GHEs) into building foundations allows them to also provide thermal energy for space heating and cooling. However, this introduces certain constraints to ground-source heat pump (GSHP) design, such as on the geometry, and thus a different design approach is required. One such approach, introduced in this article, uses machine learning techniques to very quickly and accurately determine the maximum amount of thermal energy that can reasonably be provided. A comprehensive validation of this methodology for energy piles is presented, using different geometries and thermal load distributions, drawing conclusions about how the approach can best be utilised.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2018.01.011
      Issue No: Vol. 97 (2018)
  • Three-dimensional discrete element modeling of direct shear test for
           granular rubber–sand
    • Authors: Can Wang; An Deng; Abbas Taheri
      Pages: 204 - 216
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Can Wang, An Deng, Abbas Taheri
      Three-dimensional discrete element modeling of direct shear test conducted on granular rubber–sand is presented. Excellent agreement was attained between the simulation and test results, verifying the model’s capacity of examining mixtures shear behavior. Important particulate-scale observations were attained, including the inter-particle contacts force, particles displacement and rotation, porosity and their variation with rubber particle contents. The observations demonstrate that the rubber particles inclusion amends the mixture stiffness, grading and packing at the particulate level, leading to a corresponding variation in the material shear behavior. Some interesting particulate-level simulations were examined to gain further insight into micro-mechanic characteristics of the mixtures.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2018.01.014
      Issue No: Vol. 97 (2018)
  • Behavior of a multilayered transversely isotropic half space due to
           horizontal transient loadings
    • Authors: Zhi Yong Ai; Yang Li; Chun Lin Liu
      Pages: 217 - 221
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Zhi Yong Ai, Yang Li, Chun Lin Liu
      Soils and the related structures are deeply influenced by horizontal transient loadings, such as the wind loads and the seismic forces on tall buildings, and the wave forces on offshore structures. So the stresses and displacements caused by horizontal transient loadings are worthy of study. This paper investigates the behavior of a multilayered transversely isotropic half space due to horizontal transient loadings over a circular area by using the analytical layer-element method. Numerical examples are given to make comparisons with ABAQUS and to expound the effect of transient loading characteristic, material anisotropy and loading depth on the behavior of media.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2018.01.004
      Issue No: Vol. 97 (2018)
  • Long-term settlements of a ship lock: Measurements vs. FE-prediction using
           a high cycle accumulation model
    • Authors: J. Machaček; T. Wichtmann; H. Zachert; Th. Triantafyllidis
      Pages: 222 - 232
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): J. Machaček, T. Wichtmann, H. Zachert, Th. Triantafyllidis
      During their lifetime many geotechnical structures are subject to a high number of repetitive loading cycles with small strain amplitudes, a so-called high-cyclic loading. Well-known examples are foundations for offshore wind turbines exposed to a cyclic loading caused by wind and water waves. In the case of ship locks, being the subject of the present paper, the high-cyclic loading results from the repeated filling and emptying of the lock chamber which leads to a cyclic change of the water pressures acting on the walls and the bottom of the chamber. Generally, a high-cyclic loading may lead to progressive settlements and a tilting of foundations. Up to now, the availability of validated and standardized analysis procedures for the proof of the serviceability limit state for foundations subject to high-cyclic loading is still limited. One procedure which proved good results for that purpose in recent years is a numerical approach based on finite element (FE) calculations using a high-cycle accumulation (HCA) model to predict the long-term behavior of the subsoil. Subject of this contribution is the application of the HCA model in FE simulations of the ship lock Uelzen I, aiming on a further validation of the proposed procedure. This ship is a well documented structure with long-term monitoring, significantly differing from foundations for offshore wind turbines, which were studied for the validation of the HCA-model so far. Simplifications of the subsoil and the determination of the input parameters for the FE simulations are presented. The long-term settlements predicted by the HCA model are compared to field measurements over two decades. Furthermore, a sensitivity study regarding the influence of various parameters on the predicted settlements is shown.

      PubDate: 2018-02-05T06:12:06Z
      DOI: 10.1016/j.compgeo.2018.01.009
      Issue No: Vol. 97 (2018)
  • Stochastic seismic performance assessment of high CFRDs based on
           generalized probability density evolution method
    • Authors: Rui Pang; Bin Xu; Degao Zou; Xianjing Kong
      Pages: 233 - 245
      Abstract: Publication date: May 2018
      Source:Computers and Geotechnics, Volume 97
      Author(s): Rui Pang, Bin Xu, Degao Zou, Xianjing Kong
      Determining the failure probabilities of high concrete-faced rockfill dams (CFRDs) is an important component of seismic performance assessment, considering the randomness of earthquake ground motions. In this paper, a new efficient methodology that couples the recently developed generalized probability density evolution method (GPDEM) with the spectral representation-random function method is proposed to evaluate the seismic performance of high CFRDs from a stochastic perspective. A set of representative acceleration time histories of non-stationary earthquake ground motions with complete probability are generated based on an evolutionary power spectral density model through an iterative correction to produce a good fit between the average response spectrum and the code spectrum in China’s hydraulic structure seismic code. Then, a series of deterministic dynamic calculations for a 200-m CFRD based on a generalized plasticity model modified for rockfills and a generalized plasticity interface model are performed to solve the GPDEM equation. A new face-slab damage index that considers double physical parameters (demand capacity ratio and cumulative overstress duration based on stress) is presented and its probabilityinformation is determined by constructing a virtual random process. Finally, probability density functions and cumulative distribution functions are obtained under two seismic levels by considering three performance indices corresponding to deformation, stability of dam slope and safety of face-slabs. The failure probability of different failure grades demonstrates that this new method has a good applicability to seismic performance assessment of high CFRDs.

      PubDate: 2018-02-25T22:45:53Z
      DOI: 10.1016/j.compgeo.2018.01.016
      Issue No: Vol. 97 (2018)
  • Hydraulic fracturing simulation for heterogeneous granite by discrete
           element method
    • Authors: Wei Chen; Heinz Konietzky; Chao Liu; Xin Tan
      Pages: 1 - 15
      Abstract: Publication date: March 2018
      Source:Computers and Geotechnics, Volume 95
      Author(s): Wei Chen, Heinz Konietzky, Chao Liu, Xin Tan
      In this study, a heterogeneous discrete element model of granite was built considering different mineral contacts, different mineral grains, and the percentages of minerals which were obtained from analysis of the gray-scale values of the rock picture. First, the contacts and grains parameters were fixed by simulating triaxial compression and fracture toughness tests. Then, the permeability of the numerical model was calibrated on constant head tests. Finally, a coupled hydro-mechanical code was used to investigate the hydraulic fracturing under different conditions, considering the influences of permeability, fluid viscosity, fluid injection rate, boundary stress, pre-existing cracks, heterogeneity and weak layer.

      PubDate: 2017-12-12T14:33:04Z
      DOI: 10.1016/j.compgeo.2017.11.016
      Issue No: Vol. 95 (2017)
  • Effects of vertical spatial variability on supported excavations in sands
           considering multiple geotechnical and structural failure modes
    • Authors: Zhe Luo; Yixiang Li; Shunhua Zhou; Honggui Di
      Pages: 16 - 29
      Abstract: Publication date: March 2018
      Source:Computers and Geotechnics, Volume 95
      Author(s): Zhe Luo, Yixiang Li, Shunhua Zhou, Honggui Di
      In this paper, a probabilistic assessment of supported excavations in spatially varied sands is presented. Random finite element modelling (RFEM) is performed to simulate excavation-induced responses. A procedure for automating the Monte Carlo simulation is developed to facilitate the RFEM. The effects of soil vertical spatial variability on several major geotechnical and structural failure modes, including geotechnical ultimate failure, geotechnical serviceability failure, wall bending failure, wall shear failure, and strut buckling failure, are explicitly investigated. This study demonstrates the importance of addressing the spatial variation of soil properties by considering multiple failure modes for complicated soil-structural interaction problems.

      PubDate: 2017-12-12T14:33:04Z
      DOI: 10.1016/j.compgeo.2017.11.017
      Issue No: Vol. 95 (2017)
  • A discrete numerical model involving partial fluid-solid coupling to
           describe suffusion effects in soils
    • Authors: R. Aboul Hosn; L. Sibille; N. Benahmed; B. Chareyre
      Pages: 30 - 39
      Abstract: Publication date: March 2018
      Source:Computers and Geotechnics, Volume 95
      Author(s): R. Aboul Hosn, L. Sibille, N. Benahmed, B. Chareyre
      Suffusion is a particular case of internal erosion in soils. It is a particle-scale mechanism involving the selective erosion of fine particles within the matrix of coarse particles under the effect of water seepage. Modifications in the microstructure as a consequence of the loss of a fine fraction may affect both the hydraulic and the mechanical properties of the soil. Thus leading, in some cases, to drastic consequences. In this study, a methodology based on a discrete numerical model is introduced to investigate the initiation and development of suffusion as well as to analyze its effects on the soil mechanical properties. For that purpose, an original numerical extraction procedure was developed allowing us to mimic the suffusion process by taking into account both the microstructure of the granular packing and the hydraulic loading in the suffusion development. Such a procedure is based on a one-way fluid-solid coupling where the interstitial flow is solved with a finite volume approach defined at the pore scale. Numerical soil samples subjected to different hydraulic gradients show that depending on the amount and the role of eroded particles in the granular assembly two distinct responses can be expected. The eroded medium either shows negligible deformations during erosion but then collapses suddenly once sheared or it deforms significantly during erosion and shows more reduced strength once subjected to shear forces. A non-linear relation between the eroded mass and the mechanical properties of the soil was found.

      PubDate: 2017-12-12T14:33:04Z
      DOI: 10.1016/j.compgeo.2017.11.006
      Issue No: Vol. 95 (2017)
  • Response to the discussion on “A simple critical state interface model
           and its application in prediction of shaft resistance of non-displacement
           piles in sand” by R.-F. Feng, Q.-Q. Zhang, S.-W. Liu, X.-M. Li
    • Authors: Ali Lashkari
      Pages: 40 - 43
      Abstract: Publication date: March 2018
      Source:Computers and Geotechnics, Volume 95
      Author(s): Ali Lashkari

      PubDate: 2017-12-27T01:12:25Z
      DOI: 10.1016/j.compgeo.2017.09.004
      Issue No: Vol. 95 (2017)
  • Discussion on “A simple critical state interface model and its
           application in prediction of shaft resistance of non-displacement piles in
    • Authors: Ruo-feng Feng; Qian-qing Zhang; Shan-wei Liu; Xiao-mi Li
      Pages: 44 - 45
      Abstract: Publication date: March 2018
      Source:Computers and Geotechnics, Volume 95
      Author(s): Ruo-feng Feng, Qian-qing Zhang, Shan-wei Liu, Xiao-mi Li
      In a recent paper (Lashkari, 2017), the author proposed a simple constitutive model for predicting the behaviour of a sand-structure interface under the framework of critical state soil mechanics. However, there are some issues, such as the parameters for the proposed interface model and the algorithm used for the pile segment analysis, that should be discussed in detail.

      PubDate: 2017-12-27T01:12:25Z
      DOI: 10.1016/j.compgeo.2017.09.005
      Issue No: Vol. 95 (2017)
  • A constitutive model for soil-rockfill mixtures
    • Authors: Andrea Brito; João Ribas Maranha; Laura Maria Mello Saraiva Caldeira
      Pages: 46 - 56
      Abstract: Publication date: March 2018
      Source:Computers and Geotechnics, Volume 95
      Author(s): Andrea Brito, João Ribas Maranha, Laura Maria Mello Saraiva Caldeira
      Soil-rockfill mixtures (SRMs) are economical and environmentally friendly materials. Due to the absence in the literature of constitutive models specifically developed and tested for SRMs, a new constitutive model, the Subloading Surface Rockfill Model, is presented. This model allows the occurrence of plastic strains inside the yield surface, inducing a smooth elastic/plastic transition. The results of experimental tests for different coarse fractions (CF) of several SRMs performed on samples from Odelouca Dam are compared with those obtained with this model. The model was able to reproduce reasonably well the response of SRMs considering the intrinsic variability of the tested specimens.

      PubDate: 2017-12-27T01:12:25Z
      DOI: 10.1016/j.compgeo.2017.09.009
      Issue No: Vol. 95 (2017)
  • Strength reduction method in Barodesy
    • Authors: Barbara Schneider-Muntau; Gertraud Medicus; Wolfgang Fellin
      Pages: 57 - 67
      Abstract: Publication date: March 2018
      Source:Computers and Geotechnics, Volume 95
      Author(s): Barbara Schneider-Muntau, Gertraud Medicus, Wolfgang Fellin
      Strength reduction analysis are very common in geotechnical engineering to define a factor of safety of structures, e.g. slopes. Usually, the Mohr-Coulomb strength parameters friction angle φ ′ and cohesion c ′ are reduced until limit equilibrium is reached. This method is only applicable to material models which utilize a Mohr-Coulomb or similar (e.g. Drucker-Prager) failure criterion. In this article a strength reduction method for the barodetic material model is introduced and the results of slope stability calculations compared with the results with an elasto-plastic material model (Mohr-Coulomb) and with the results of an analytical analysis according to Bishop are presented. The strength reduction method for barodesy has been implemented in the Finite Element code Abaqus.

      PubDate: 2017-12-27T01:12:25Z
      DOI: 10.1016/j.compgeo.2017.09.010
      Issue No: Vol. 95 (2017)
  • Underground excavation behaviour in Bangkok using three-dimensional finite
           element method
    • Authors: Chhunla Chheng; Suched Likitlersuang
      Pages: 68 - 81
      Abstract: Publication date: March 2018
      Source:Computers and Geotechnics, Volume 95
      Author(s): Chhunla Chheng, Suched Likitlersuang
      This study provides evidence that three-dimensional finite element modelling can be effectively applied for deep excavation analysis in Bangkok. The Bangkok subsoils were modelled using the hardening soil model and their parameters were calibrated against the results of laboratory and field tests. A study of a MRT station excavation was initially used to validate the model. The predicted wall movements and surface settlements were compared with the instrument data and two-dimensional analysis from a previous study. Another deep excavation project was selected asan independent study. The result shows that the model can be confidently used for deep excavation analysis.

      PubDate: 2017-12-27T01:12:25Z
      DOI: 10.1016/j.compgeo.2017.09.016
      Issue No: Vol. 95 (2017)
  • Including degree of capillary saturation into constitutive modelling of
           unsaturated soils
    • Authors: Annan Zhou; Shengshen Wu; Jie Li; Daichao Sheng
      Pages: 82 - 98
      Abstract: Publication date: March 2018
      Source:Computers and Geotechnics, Volume 95
      Author(s): Annan Zhou, Shengshen Wu, Jie Li, Daichao Sheng
      The degree of saturation ( S ) of soil can be separated into two components: the degree of capillary saturation ( S ′ ) that is based on the capillary water and the degree of adsorptive saturation ( S ″ ) that is based on the adsorbed water. This paper discusses the role of the degree of capillary saturation ( S ′ ) in modelling the coupled hydro-mechanical behaviour of unsaturated soils and proposes a new constitutive model for unsaturated soils by using the degree of capillary saturation ( S ′ ) and the effective inter-particle stress ( σ ij ′ ). An enhanced hydraulic model is introduced to describe the hydraulic hysteresis and hydro-mechanical interaction in terms of the degree of capillary saturation ( S ′ ). In the proposed constitutive model, the shear strength, yield stress and deformation behaviour of unsaturated soils are governed directly by the above two constitutive variables, namely σ ij ′ and S ′ . To be in line with the existing finite element frameworks for unsaturated soils, the proposed model is eventually generalised to constitutive functions consisting of only primary variables such as the net stress ( σ ij ), suction ( s ) and degree of saturation ( S ). The typical performance of the model for simulating the characteristic trends of unsaturated soil behaviour is discussed in several different scenarios. The model is then validated against a variety of experimental data in the literature, and the results show that a reasonable agreement can be obtained using this new constitutive model.

      PubDate: 2017-12-27T01:12:25Z
      DOI: 10.1016/j.compgeo.2017.09.017
      Issue No: Vol. 95 (2017)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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Fax: +00 44 (0)131 4513327
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