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  Subjects -> ENGINEERING (Total: 2417 journals)
    - CHEMICAL ENGINEERING (207 journals)
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    - ELECTRICAL ENGINEERING (111 journals)
    - ENGINEERING (1267 journals)
    - ENGINEERING MECHANICS AND MATERIALS (400 journals)
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ENGINEERING (1267 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: 21)
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: 273)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
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 Journal of Graduate Research     Open Access  
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 10)
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: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 17)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 13)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 6)
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: 44)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 3)
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: 24)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
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: 6)
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: 5)
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: 28)
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: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Beyond : Undergraduate Research Journal     Open Access  
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Bilge International Journal of Science and Technology Research     Open Access  
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 11)
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: 21)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 37)
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   (Followers: 1)
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Bitlis Eren University Journal of Science and Technology     Open Access  
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: 12)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 13)
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   (Followers: 2)
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  
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: 3)
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: 21)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Clinical Science     Full-text available via subscription   (Followers: 9)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 6)
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: 14)
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: 277)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 208)
Composites Part B : Engineering     Hybrid Journal   (Followers: 249)
Composites Science and Technology     Hybrid Journal   (Followers: 193)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access   (Followers: 1)
Computational Geosciences     Hybrid Journal   (Followers: 16)
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: 31)
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: 7)
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)

        1 2 3 4 5 6 7 | Last

Journal Cover
Computers and Geotechnics
Journal Prestige (SJR): 1.979
Citation Impact (citeScore): 3
Number of Followers: 11  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0266-352X
Published by Elsevier Homepage  [3163 journals]
  • Internal stress distribution and cracking around flaws and openings of
           rock block under uniaxial compression: A particle mechanics approach
    • Abstract: Publication date: October 2018
      Source:Computers and Geotechnics, Volume 102
      Author(s): Xiang Fan, Kaihui Li, Hongpeng Lai, Yongli Xie, Rihong Cao, Jun Zheng
      Based on experimental results, bonded particle models containing flaws or/and openings were created to investigate the peak stress, crack-initiation stress, number of micro-cracks, local stress distribution and cracking behavior under uniaxial compression. It is found that flaws and openings are distinctly related to the peak stress, the crack-initiation stress and the number of micro-cracks. As the flaw inclination angle increases, the distributions of principal stresses surrounding a flaw vary, while those surrounding an opening present a similar shape with magnitude differences. The distribution of local stress well accounts for the cracking behavior.

      PubDate: 2018-06-18T14:22:39Z
       
  • Three-dimensional modeling of geocell-reinforced straight and curved
           ballast embankments
    • Abstract: Publication date: October 2018
      Source:Computers and Geotechnics, Volume 102
      Author(s): Yang Liu, An Deng, Mark Jaksa
      This paper outlines a three-dimensional modeling study conducted on straight and curved geocell-reinforced embankments. The study uses the discrete element method to represent varying angularities of ballast infill and models their mechanical response under monotonic and cyclic loading conditions. The simulation results show good agreement with test results and the case studies indicate that the geocell enhances embankment stiffness under monotonic loading and improves its resilience when subjected to cyclic loading. The geocell more evenly distributes stresses within the ballast embankments. The reinforced ballast embankments also exhibit less vertical displacement and lateral spreading than the unreinforced ballast embankments do.

      PubDate: 2018-06-18T14:22:39Z
       
  • Probabilistic HM failure envelopes of strip foundations on spatially
           variable soil
    • Abstract: Publication date: October 2018
      Source:Computers and Geotechnics, Volume 102
      Author(s): Amal Hentati, Mbarka Selmi, Tarek Kormi, Nizar Bel Hadj Ali
      The bearing capacity of offshore foundations, subject to combinations of vertical, horizontal and moment loading, is generally defined through failure envelopes. These envelopes are commonly determined assuming a spatially homogeneous soil which is an unrealistic hypothesis. In this paper, probabilistic failure envelopes of strip foundations are determined taking into account the spatial variability of soil shear strength through a random finite element method (RFEM). The proposed approach combines finite element analysis, random field theory and Monte Carlo simulations. Through a strip foundation case-study, this paper shows the influence of soil spatial variation on ultimate capacities, failure mechanism and failure envelopes.

      PubDate: 2018-06-18T14:22:39Z
       
  • A practical approach for reliability analysis of unsaturated slope by
           conditional random finite element method
    • Abstract: Publication date: October 2018
      Source:Computers and Geotechnics, Volume 102
      Author(s): A. Johari, A. Gholampour
      The paper presents a method for reliability analysis of slopes in unsaturated soils. Conditional random fields are simulated by consideration possible fluctuations of the measured soil properties. To predict the unsaturated soil behaviour, suctions are estimated and implemented in a finite element analysis. Numerical results of a case study demonstrate that the use of conditional random fields, affects not only the standard deviation of the safety factor distribution, but can also cause considerable variation in the mean value. It is concluded that unsaturated conditions can result in higher slope reliability, but with potentially more extensive failure zones.

      PubDate: 2018-06-18T14:22:39Z
       
  • Analytical model for vapour-phase VOCs transport in four-layered landfill
           composite cover systems
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Haijian Xie, Qiao Wang, Abdelmalek Bouazza, Shijin Feng
      An analytical model for vapour-phase volatile organic compound (VOC) diffusion through four-layered landfill cover system consisting of a soil protective layer, a drainage layer, a geomembrane, and a compacted clay liner (CCL) or geosynthetic clay liner (GCL) is presented. VOCs transport in the cover system is sensitive to the changes of Sr in the protective layer and CCL rather than that of the drainage layer. When Sr 1 = Sr 2 = Sr 4 = 0.5, in order to meet the EPA standard on benzene concentration, the thickness of CCL should be greater than 200 cm or it should be modified with 2% biochar.

      PubDate: 2018-06-06T14:05:15Z
       
  • Numerical model to predict the displacement of piles under cyclic lateral
           loading using a new hypoplastic spring element
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): A. Carstensen, T. Pucker, J. Grabe
      A numerical model to predict the displacement of piles under cyclic lateral loading using a new type of spring element is demonstrated. The formulation of the numerical model is based on the subgrade reaction method and allows for modelling of a limited number of cycles. To accurately represent the soil behaviour, the spring elements are established on a hypoplastic formulation. Thereby, important soil properties like barotropy, pycnotropy and directionality are captured. Input parameters are determined by laboratory tests and correlations from literature. Performance of the new approach is demonstrated and the results are compared to Finite-Element-Analyses and current standards.

      PubDate: 2018-06-06T14:05:15Z
       
  • A vehicle-track-tunnel-soil model for evaluating the dynamic response of a
           double-line metro tunnel in a poroelastic half-space
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Honggui Di, Shunhua Zhou, Zhe Luo, Chao He, Junhua Xiao, Xue Li
      In this study, a three-dimensional vehicle-track-tunnel-soil model for evaluating the dynamic response of a double-line metro tunnel in a poroelastic half-space is developed. The model development consists of two steps. In the first step, the vehicle-track-tunnel-soil model in a full-space is developed. In the second step, based on the full-space model, the dynamic response of the poroelastic half-space is solved by using the 2.5-dimensional boundary integral equation and the Green’s function. The developed vehicle-track-tunnel-soil model is validated against existing tunnel models and is demonstrated through a case study of the dynamic response induced by one-way and two-way train loads.

      PubDate: 2018-06-06T14:05:15Z
       
  • Physical and numerical evaluation of rock strength in Split Hopkinson
           Pressure Bar testing
    • Abstract: Publication date: October 2018
      Source:Computers and Geotechnics, Volume 102
      Author(s): A. Fakhimi, P. Azhdari, J. Kimberley
      Split Hopkinson Pressure Bar (SHPB) testing was used to evaluate the strength characteristics of sandstone under uniaxial compressive loading. The physical results suggest that rock strength increases under dynamic loading. A hybrid bonded particle-finite element model was used for numerical simulation of SHPB tests. A parameter called rock strength enhancement coefficient was introduced which is multiplied by the relative velocity of particles at the contact points to increase the bond strength between the particles. It is shown that a much better match between the physical and numerical results is realized if this enhancement coefficient is applied in the numerical simulation.

      PubDate: 2018-06-03T13:53:09Z
       
  • Modeling of brittle rock failure considering inter- and intra-grain
           contact failures
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Xin Wang, Ming Cai
      Based on a two-scale tessellation technique in Neper, a 3DEC-GBM modeling approach considering inter- and intra-grain contact failures is proposed to study brittle rock failure. Plane strain problems are solved using 3DEC to reduce computation time. A parametric study of inter- and intra-grain contact properties is conducted and a calibration procedure is suggested for determining micro-mechanical properties of granular materials. The modeling results indicate that inter- and intra-grain contact strength heterogeneity affects not only the peak strength of rock but also the microcrack spatial location and hence the fracture development path and fracture pattern.

      PubDate: 2018-05-31T13:44:59Z
       
  • Deformational behaviour of steel sheet piles during jacking
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): David Osthoff, Jürgen Grabe
      In geotechnical engineering the simulation of penetration processes is an important tool for the prediction of the bearing capacity of structures and of the soil behaviour in the near field. Generally the numerical analysis of penetration processes is limited to penetrating bodies, which experience no deformation during simulation. The reason for this limitation is determined by the enormous computational costs. This paper presents a novel method to simulate the penetration process considering the deformation behaviour of slender profiles with relatively low bending and torsional stiffness such as sheet piles. The numerical analyses are carried out using the Coupled Eulerian-Lagrangian (CEL) approach. The modelling method is validated by 1g-model tests. Applying this method to the jacking simulation of sheet piles, in particular U- and Z-sections, it can be shown, that the stress state between the surfaces of web and flange increases due to soil plugging. Hence, higher shaft resistance in the corner regions forces the profile to deform. The influence of the profile’s deformation on the reaction forces is significant and must be considered.

      PubDate: 2018-05-28T13:42:23Z
       
  • Crushing and oedometer compression of rockfill using DEM
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): João Manso, João Marcelino, Laura Caldeira
      A new methodology was developed to perform computer simulations of crushable rockfill particles using the discrete element method. Rockfill was modelled using a clump logic, responsible for providing a statistical and spatial variability in the strength and shape of the particles. Clumps have a major advantage of severely decreasing the number of contact equations to be solved in the model, resulting in less computer time. A series of single-particle crushing tests and an oedometer test were simulated using crushable particles and were in agreement with experimental data. A comprehensive study of the brittle failure of single-particle crushing tests is presented.

      PubDate: 2018-05-28T13:42:23Z
       
  • Application of CFD-DEM to investigate seepage characteristics of landslide
           dam materials
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Zhen-Ming Shi, Hong-Chao Zheng, Song-Bo Yu, Ming Peng, Tao Jiang
      A coupled computational fluid dynamics and discrete element method was presented to quantitatively investigate the seepage characteristics of fine and coarse materials relevant to landslide dam. The numerical model was verified by comparing the calculated seepage parameters, critical hydraulic gradient and failure mode with the corresponding tests. The microcosmic mechanisms of the seepage failure were studied by considering seepage field, force chain, and particle trajectory. The failure mode of fine-grained soils was flowing soil because the effective stress was close to zero. However, for coarse-grained soils, the failure mode was piping that resulted from the presence of some effective stress.

      PubDate: 2018-05-28T13:42:23Z
       
  • Probabilistic stability analysis of an earth dam by Stochastic Finite
           Element Method based on field data
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): A. Mouyeaux, C. Carvajal, P. Bressolette, L. Peyras, P. Breul, C. Bacconnet
      This paper performs a probabilistic stability analysis for an existing earthfill dam using a Stochastic Finite Element Method (SFEM) and considering the spatial variability of soil properties based on field data. Previous works on probabilistic slope stability analysis are generally based on hypothetical data while using data from existing earth structures is not widespread. A probabilistic procedure based on field data is here implemented to analyze the stability of an existing embankment dam. The spatial variability of several soil properties is modeled from the geostatistical analysis of the available dataset of the dam studied. Random variables and random fields representing the variability of dam materials are integrated into an FE model by performing Monte Carlo simulations (MCS). This probabilistic analysis based on field data allowed to characterize the variability of the sliding safety factor for the case study of an existing dam.

      PubDate: 2018-05-28T13:42:23Z
       
  • Lateral behaviour of a pile group due to side-by-side twin tunnelling in
           dry sand: 3D centrifuge tests and numerical modelling
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): M.A. Soomro, C.W.W. Ng, N.A. Memon, R. Bhanbhro
      This paper presents lateral responses of an existing 2 × 2 pile group to advancement of side-by-side twin tunnels (with 1% volume loss) at various depths in dry sand using 3D centrifuge and numerical modelling. The tunnels were located near mid-depth of the pile shaft (test SS), next to (test TT) and below the toe (test BB) of the pile group. The largest and the smallest lateral movement of the pile cap was induced after first tunnelling in test TT and test SS, respectively. The shearing force was induced in piles as a reaction of pile deflection in tests TT and BB.

      PubDate: 2018-05-28T13:42:23Z
       
  • A hybrid plastic flow rule for cyclically loaded clay
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Zhenhao Shi, Richard J. Finno, Giuseppe Buscarnera
      The strength loss of clays subjected to seismic loading is a crucial factor promoting slope instability. This paper proposes a constitutive modeling strategy to simulate accurately the development of pore pressure in cyclically loaded clays, i.e. one major factor responsible for strength deterioration during earthquakes. For this purpose, an enhanced plastic flow rule is proposed within the bounding surface framework to represent the cyclic behavior of reconstituted and/or weakly structured clays. The verification of the model against experimental evidence shows that the proposed flow rule improves the accuracy with which sign and magnitude of the pore pressure increments are computed.

      PubDate: 2018-05-28T13:42:23Z
       
  • A new model for capturing void ratio-dependent unfrozen water
           characteristics curves
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Q.Y. Mu, C.W.W. Ng, C. Zhou, G.G.D. Zhou, H.J. Liao
      A new unfrozen water characteristics curve (UWCC) model is proposed with explicit considerations of both capillarity and adsorption. Capillarity is considered to be dominant when the freezing of soil pore water occurs at higher temperatures, whereas the effects of adsorption are pronounced at lower temperatures. The proposed model is applied to predict UWCCs of silt at different initial void ratios and clay over a wide range of temperatures. It was found that the new model can capture the effects of void ratio on the UWCC. Moreover, the new model can better predict the UWCC over a wide range of temperatures.

      PubDate: 2018-05-28T13:42:23Z
       
  • Semi-analytical solutions to two-dimensional plane strain consolidation
           for unsaturated soil
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Lei Wang, Yongfu Xu, Xiaohe Xia, De'an Sun
      This paper presents semi-analytical solutions to two-dimensional plane strain consolidation of unsaturated soils under different initial and boundary conditions. By applying the finite sine and Laplace transforms, the partial differential equations are converted to the ordinary differential equations. The semi-analytical solutions are obtained by using the finite sine inversion transform. Crump’s method is adopted to perform the inverse Laplace transform to obtain analytical solutions in time domain. The present solutions are more general and can be degenerated into conventional solutions to one-dimensional consolidation of unsaturated soils. Several examples are provided to investigate two-dimensional plane strain consolidation behavior of unsaturated soils.

      PubDate: 2018-05-28T13:42:23Z
       
  • Coupled effective stress analysis of insertion problems in geotechnics
           with the Particle Finite Element Method
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Lluís Monforte, Marcos Arroyo, Josep Maria Carbonell, Antonio Gens
      This paper describes a computational framework for the numerical analysis of quasi-static soil-structure insertion problems in water saturated media. The Particle Finite Element Method is used to solve the linear momentum and mass balance equations at large strains. Solid-fluid interaction is described by a simplified Biot formulation using pore pressure and skeleton displacements as basic field variables. The robustness and accuracy of the proposal is numerically demonstrated presenting results from two benchmark examples. The first one addresses the consolidation of a circular footing on a poroelastic soil. The second one is a parametric analysis of the cone penetration test (CPTu) in a material described by a Cam-clay hyperelastic model, in which the influence of permeability and contact roughness on test results is assessed.

      PubDate: 2018-05-28T13:42:23Z
       
  • A hybrid algorithm of partitioned finite element and interface element for
           dynamic contact problems with discontinuous deformation
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Shujie Fan, Tongchun Li, Xiaoqing Liu, Lanhao Zhao, Zhiwei Niu, Huijun Qi
      This work introduces the interactive method of partitioned finite element and interface element (PFE/IE) to analyse the dynamic behaviours of structures with discontinuous deformations. The dynamic IE equations can be derived by combining the nonlinear equation based on the Newmark method and the dynamic equilibrium equation. The nodal displacement can be solved via PFE by combining the contact force into the total force vector; consequently, the failure state can be procured. PFE/IE improves the computational efficiency as nonlinear iteration is limited to the possible contact region. Dynamic results obtained with other techniques or experiments are introduced and compared to validate the accuracy and robustness of PFE/IE.

      PubDate: 2018-05-28T13:42:23Z
       
  • Life-cycle reliability-based assessment of internal stability for
           mechanically stabilized earth walls in a heavy haul railway
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Biao Hu, Zhe Luo
      This paper presents an efficient system reliability approach for the internal instability of mechanically stabilized earth walls in a heavy haul railway. The first-order reliability method is adopted to assess the wall failures due to rupture and pullout. The effects of uncertainties in the backfill unit weight, the friction angle of backfill and the friction along the soil-reinforcement interface, as well as the width, thickness and tensile strength of steel strips are explicitly explored. Moreover, the system reliability analysis clearly demonstrates the impact of steel corrosion on the life-cycle retaining wall stability.

      PubDate: 2018-05-28T13:42:23Z
       
  • Large scale parallelisation of the material point method with multiple
           GPUs
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Youkou Dong, Jürgen Grabe
      The material point method (MPM), which is a combination of the finite element and meshfree methods, suffers from significant computational workload due to the fine mesh required in spite of its advantages in simulating large deformations. This paper presents a parallel computing strategy for the MPM with multiple Graphics Processing Units (GPUs) to boost the method’s computational efficiency in large scale problems. Domain decomposition method is used to split the workload over subdomains onto a number of GPUs. Communication between the subdomains is implemented by the data transfer between GPUs and random access memory. On each GPU the MPM algorithm is parallelised over nodes or particles. Benchmark problems of slurry runout and surface pipe penetration are analysed to quantify the speedup of the multiple-GPU parallel simulations over the sequential counterparts on the central processing unit. The maximum speedup with 1 GPU is 84 and increases to ∼1280 using 16 GPUs.

      PubDate: 2018-05-28T13:42:23Z
       
  • Elastoplastic axisymmetric Cosserat continua and modelling of strain
           localization
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Hongxiang Tang, Fabing Sun, Yipeng Zhang, Yan Dong
      The theory and finite-element formula of the axisymmetric Cosserat continuum are presented by introducing an independent rotational degree of freedom into the axisymmetric continuum. A pressure-dependent elastic-plastic model and the corresponding consistent algorithm for the constitution integration of the model are presented in the framework of the axisymmetric Cosserat continuum theory. The numerical examples illustrate that the developed model can maintain the well-posedness of the boundary value problems; overcome the problems of mesh-dependency, which commonly occur in the classical continuum when the strain softening behaviour is incorporated; and capture the entire progressive failure process.

      PubDate: 2018-05-28T13:42:23Z
       
  • Numerical solution of Richards’ equation of water flow by
           generalized finite differences
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): C. Chávez-Negrete, F.J. Domínguez-Mota, D. Santana-Quinteros
      Richards equation is a degenerate elliptic parabolic nonlinear expression which models flow in unsaturated porous media. Due to its importance in engineering, a number of linearization schemes for approximating its solution have been proposed. Among the more efficient are combinations of Newtonian iterations for the spatial discretization using finite elements, and an implicit θ -method for the time integration. However, when the finite element formulation is used, numerical oscillations near the infiltration front are presented. To overcome this problem, this paper presents a novel generalized finite differences scheme and an adaptive step size Crank-Nicolson method, which can be applied for solving Richards’ equation on nonrectangular structured grids. The proposed method is tested on an illustrative numerical example on a road embankment and the results are compared with a finite element method solution.

      PubDate: 2018-05-28T13:42:23Z
       
  • Random bearing capacity evaluation of shallow foundations for asymmetrical
           failure mechanisms with spatial averaging and inclusion of soil
           self-weight
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Wojciech Puła, Marcin Chwała
      In this study, multi-block failure mechanisms in conjunction with Vanmarcke’s spatial averaging approach are used to evaluate random bearing capacity. This new approach examines the impact of the asymmetrical mechanism in spatially variable soil and the effect of anisotropy. The soil strength parameters were modelled by random fields that were discretized by spatial averaging along slip surfaces. Reliability indices were evaluated for symmetrical and asymmetrical cases. The results show that for higher values of horizontal fluctuation scales, the difference between symmetrical and asymmetrical approaches becomes negligible; however, for smaller values, it can be significant.

      PubDate: 2018-05-28T13:42:23Z
       
  • Advanced 3-D Boundary Element analysis of underground excavations
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Gernot Beer, Christian Duenser
      In this work a novel approach is presented for the Boundary Element analysis of underground excavation problems. Firstly, Non-Uniform Rational B-Spines (NURBS) are used for the description of the geometry and for the approximation of the unknowns. This results in a significant decrease in the number of parameters used for an accurate description of the geometry as well as a decrease in the number of degrees of freedom required for good quality results. Secondly, NURBS are also used for the description of the geometry of geological inclusions, which can have properties different to the rock mass and can experience inelastic behavior.

      PubDate: 2018-05-28T13:42:23Z
       
  • Scaled boundary point interpolation method for seismic soil-tunnel
           interaction analysis
    • Abstract: Publication date: September 2018
      Source:Computers and Geotechnics, Volume 101
      Author(s): Mehran Hassanzadeh, Hamid Reza Tohidvand, Masoud Hajialilue-Bonab, Akbar A. Javadi
      The scaled boundary method (SBM) is an effective numerical approach for analyzing elasto-statics of bounded and unbounded media. To enhance abilities of the scaled boundary approach, this method can be coupled with mesh free technology. In this paper a point interpolation based SBM is proposed to analyze seismic soil-tunnel interaction problems. In the proposed approach, boundary of the domain is modelled with the scaled boundary point interpolation method while the interior domain is modelled by the conventional finite element method (FEM). This is the first time that a mesh-free scaled boundary method is used to analyze seismic problems. The presented method has some advantages over previously presented mesh-free SBMs. In the scaled boundary point interpolation method, the shape functions have the Kronecker delta function property and do not require radial basis functions to discretize the boundary of 2D problems. A shaking table test is designed and used to verify the proposed method. It is shown that the proposed numerical approach leads to results that are in a good agreement with those of the designed shaking table tests.

      PubDate: 2018-05-28T13:42:23Z
       
  • Numerical simulation of the blast response of cemented paste backfilled
           stopes
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Gonzalo Suazo, Gabriel Villavicencio
      The effects of underground blasting on stress wave propagation, blast response and generation of pore water pressures in cemented paste backfilled (CPB) stopes is researched in this study. Through LS-DYNA the effects of sequencing of detonation and number and blasthole proximity on the total and residual pore pressures exerted in the fill was explored. Results show that liquefaction risk decreases as explosives are detonated in rows located perpendicular to stope’s exposed face with delay times in excess of two milliseconds. Cementation of CPB was not observed to affect blast induced pressures in fully saturated backfills but decreases liquefaction risk.

      PubDate: 2018-05-28T13:42:23Z
       
  • Numerical simulation of two-tier geosynthetic-reinforced-soil walls using
           two-phase approach
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Ehsan Seyedi Hosseininia, Ahoo Ashjaee
      In this study, the mechanical behavior of two-tier Geosynthetic-Reinforced Soil walls is investigated numerically by using the concept of two-phase systems. Comparison of the results of this approach with those of discrete numerical models and centrifuge tests indicates that the approach has the ability to consider the interaction between tiers, predict the reinforcement load and wall-face displacement. Furthermore, it is more cost-effective. The limitations of this approach pertain to the prediction of the failure surface and the wall deformation regime. Totally, the two-phase approach can be properly applied in a fast, effective and safe manner.

      PubDate: 2018-05-28T13:42:23Z
       
  • A semi-resolved CFD-DEM model for seepage-induced fine particle migration
           in gap-graded soils
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Kuang Cheng, Yin Wang, Qing Yang
      A semi-resolved CFD-DEM model is proposed to model the seepage-induced fine particle migration within the gap-graded soils consisting of fine and coarse particles. In this model, a resolved method, i.e., Fictitious Domain (FD) method is used to resolve the fluid flow around the coarse particles and the un-resolved approach based on the locally averaging theory is adopted to describe the interactions between the fine particles and the fluid flow for the computational efficiency. The semi-resolved CFD-DEM model is validated using several simple examples and is further used to analyze the fine particle migration and associated piping erosion in gap-graded soils.

      PubDate: 2018-05-28T13:42:23Z
       
  • Packing of discrete and irregular particles
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Pejman Tahmasebi
      A new conditional modeling along with a level-set method that can produce high quality and large packs of irregular particles is proposed. First, an initial pack of particles is generated statistically using the particles provided through an X-ray image. Then, the mismatch locations, wherein an error map identifies the particles manifest unrealistic shapes, are detected. Next, a level-set algorithm is applied to refine the defected particles using the statistical distributions extracted from the actual particles. The generated packs are statistically and physically (i.e. flow modeling) compared with the original particles and they all represent an excellent agreement.

      PubDate: 2018-05-28T13:42:23Z
       
  • Lattice simulation of laboratory hydraulic fracture containment in layered
           reservoirs
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Pengju Xing, Keita Yoshioka, Jose Adachi, Amr El-Fayoumi, Branko Damjanac, Andrew P. Bunger
      Hydraulic fracture containment in layered reservoirs is simulated using a numerical model that couples fluid flow with a lattice representation of the solid with quasi-random distributed nodes connected by springs. We consider the influence of horizontal stress contrasts between layers, vertical stress, material fracture toughness, and the presence of horizontal weak interfaces. Observed results define distinct regions in a parametric space characterized by height growth, containment, and growth along the horizontal weak interface (T-shape growth). These numerical results match well to laboratory experimental benchmarks, and they extend the parametric study beyond what can be considered in the laboratory.

      PubDate: 2018-05-28T13:42:23Z
       
  • 3D FEM approach for laterally loaded monopile design
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Gerry Murphy, David Igoe, P. Doherty, K. Gavin
      Over the past 5 years, a substantial research effort aimed at optimising the design of offshore wind turbines has led to significant reductions in the projected cost of developing offshore wind. Optimising the geotechnical design of these structures, through modern analysis techniques such as 3D Finite Element Modelling (FEM), has played a key role in helping to reduce costs. This paper presents a methodology for accurately modelling monopile behaviour using Cone Penetration Test (CPT) data to calibrate the non-linear stress dependent Hardening Soil (HS) model. The methodology is validated by comparing the modelled behaviour to field tests on a range of pile geometries. The paper also demonstrates how the soil-pile reaction response curves can be extracted from the FE model by isolating the stresses on each element of the pile. The contribution of each component to the overall lateral resistance is shown to vary with the pile geometry and is examined using the extracted soil reaction curves.

      PubDate: 2018-05-28T13:42:23Z
       
  • Acceleration of a 2D/3D finite-discrete element code for geomechanical
           simulations using General Purpose GPU computing
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): A. Lisjak, O.K. Mahabadi, L. He, B.S.A. Tatone, P. Kaifosh, S.A. Haque, G. Grasselli
      This paper presents a novel implementation of a hydro-mechanically coupled, finite-discrete element method (FDEM) optimized to exploit the computing parallelism of graphics processing units (GPUs). A co-processing approach is adopted with the control loop of FDEM executed serially on the CPU and compute-intensive tasks off-loaded to the GPU. A benchmarking study indicates speedups of up to 100 × compared to sequential CPU execution. The implementation is validated by comparing 3D laboratory-scale rock fracturing simulations with experimental results. The effectiveness of the approach for practical rock engineering applications is demonstrated through the back analysis of a slope in a fractured rock mass.

      PubDate: 2018-05-28T13:42:23Z
       
  • Ground-source heat pump systems: The effect of variable pipe separation in
           ground heat exchangers
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Nikolas Makasis, Guillermo A. Narsilio, Asal Bidarmaghz, Ian W. Johnston
      Closed loop ground-source heat pump (GSHP) systems use ground heat exchangers (GHEs) to transfer heat to and from the ground and efficiently provide clean and renewable energy for heating and cooling purposes. Vertical GHEs contain pipes with circulating fluid (loops), which transfer thermal energy between the ground and the fluid. One very common assumption made in designing GSHP systems is that, when installed, these loops remain evenly separated along the length of the GHE, something that due to the nature of construction is rarely true. This can result in thermal interference not accounted for in the design, leading to a potential negative impact on the performance of the system. This paper investigates the effect of this interference, using detailed numerical simulations to compare different geometries, modelling fixed and variable pipe separations. A comprehensive parametric analysis is conducted to identify some of the most influential design parameters and the potential consequences on running and capital costs. Amongst the key findings of this study is the importance of the borehole filling material, as a highly thermally conductive material can minimise these negative effects from the thermal interference by up to 60%. Moreover, potential increases in drilling (capital) costs of up to 24% are shown, while the potential increases in running costs due to the reduced efficiency were found to be relatively minor.

      PubDate: 2018-05-28T13:42:23Z
       
  • Design procedure for the modelling of jet-grout column slabs supporting
           deep excavations
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Emilios M. Comodromos, Mello C. Papadopoulou, Konstantinos Georgiadis
      Overlapping jet-grout columns are often used to form a grout slab at the bottom of deep excavations to support the retaining structures. Columnar geometrical imperfections, spatially varying strength and stiffness and the post-peak behaviour of the grout, render the simulation of the jet-grout column slab a very complex issue. In practice, these aspects are not taken into account and simplified models are commonly used, in conjunction with the application of a strength reduction factor. With the aim to improve the existing design process and extend its applicability to serviceability limit state analysis, a consistent design procedure is presented.

      PubDate: 2018-05-28T13:42:23Z
       
  • Vertical vibrations of rigid foundations of arbitrary shape in a
           multi-layered poroelastic medium
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Teerapong Senjuntichai, Suraparb Keawsawasvong, Rawiphas Plangmal
      This paper presents dynamic response of rigid foundations of arbitrary shape embedded in a multi-layered poroelastic medium subjected to time-harmonic vertical loading. The contact surface between foundation and poroelastic medium is smooth, and either permeable or impermeable. This dynamic interaction problem is investigated by employing a discretization technique and an exact stiffness matrix scheme. Selected numerical results are shown to portray the influence of various parameters such as foundation shape, embedded depth, and poroelastic effects on vertical compliances of various rigid foundations in multi-layered poroelastic media. In addition, vertical vibrations of mudmat foundations on water-saturated layered soils are also presented.

      PubDate: 2018-05-28T13:42:23Z
       
  • Model updating and uncertainty analysis for creep behavior of soft soil
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Wan-Huan Zhou, Fang Tan, Ka-Veng Yuen
      Of late, various constitutive models have been proposed in the literature for the purpose of capturing the various complex physical mechanisms governing the creep behavior of soft soil. However, the more complex the model, the greater the number of associated uncertain parameters it has, and the less robustness it is. In this study, the Bayesian model class selection approach is applied to select the most plausible/suitable model describing the creep behavior of soft soil using laboratory measurements. In total, one elastic plastic (EP) model and eight elastic viscoplastic (EVP) models are investigated. To assess the performance of the different models in the prediction of creep behavior of soft soils, Bayesian model class selection is respectively performed using the oedometer test data from the intact samples of Vanttila clay and reconstituted samples of Hong Kong Marine Clay collected from the literature. All unknown model parameters are identified simultaneously by adopting the transitional Markov Chain Monte Carlo (TMCMC) method, and their uncertainty is quantified through the obtained posterior probability density functions (PDFs). The result shows that the proposed method is an excellent candidate for identifying the most plausible model and its associated parameters for different kinds of soft soils. The approach also provides uncertainty evaluation of the model prediction based on the given data.

      PubDate: 2018-05-28T13:42:23Z
       
  • Dynamic response and pile-soil interaction of a heavy-haul railway
           embankment slope reinforced by micro-piles
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Jie Dong, Zhi-Hui Wu, Xin Li, Hong-Yun Chen
      We investigated the dynamic characteristics and pile-soil interaction of a heavy-haul embankment reinforced by micro-piles. First, the vibration of a heavy-haul railway under a C80 train was tested. Based on the acceleration test, the dynamic response characteristics were further studied using a model test and 3D numerical simulation, which were verified via comparison with the field test. Finally, by integrating the model test and numerical simulation results, the influence of the pile length, pile diameter and pile spacing on the dynamic behavior of the embankment was analyzed, and the vibration-attenuation characteristics and dynamic soil-arching effect were discussed.

      PubDate: 2018-05-28T13:42:23Z
       
  • A Petrov-Galerkin finite element method for 2D transient and steady state
           highly advective flows in porous media
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): W. Cui, K.A. Gawecka, D.M. Potts, D.M.G. Taborda, L. Zdravković
      A new Petrov-Galerkin finite element method for two-dimensional (2D) highly advective flows in porous media, which removes numerical oscillations and retains its precision compared to the conventional Galerkin finite element method, is presented. A new continuous weighting function for quadratic elements is proposed. Moreover, a numerical scheme is developed to ensure the weighting factors are accurately determined for 2D non-uniform flows and 2D distorted elements. Finally, a series of numerical examples are performed to demonstrate the capability of the approach. Comparison against existing methods in the simulation of a benchmark problem further verifies the robustness of the proposed method.

      PubDate: 2018-05-28T13:42:23Z
       
  • Stochastic analysis of three-dimensional hydraulic conductivity upscaling
           in a heterogeneous tropical soil
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Vanessa A. Godoy, Lázaro Valentin Zuquette, J. Jaime Gómez-Hernández
      Hydraulic conductivity (K) heterogeneity is seldom considered in geotechnical practice for the impossibility of sampling the entire area of interest and for the difficulty of accounting for scale effects. Stochastic three-dimensional K upscaling can tackle these two problems, and a workflow is described with an application in a tropical soil. The application shows that K heterogeneity can be incorporated in the daily practice of the geotechnical modeler while discussing the aspects to consider when performing the upscaling so that the upscaled models reproduce the average fluxes at the fine scale.

      PubDate: 2018-05-28T13:42:23Z
       
  • Adaptive meshing scheme for prediction of high-speed moving loads induced
           ground vibrations
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Reda Mezeh, Marwan Sadek, Fadi Hage Chehade, Hussein Mroueh
      This article proposes an advanced modeling of the vibrations induced by high speed time-variant moving loads. The model considers the complex mutual dynamic coupling between the track components and the subgrade layer, thus a high realistic simulation of force transmission from rail interface to soil is involved. An adaptive meshing scheme is proposed to simulate the moving loads effect. The spatiotemporal mesh parameters are investigated within the frame of adaptive meshing. Numerical experiments carried out in the sub-Rayleigh and super-Rayleigh velocity ranges show an important capacity of the proposed scheme to model the impact of moving loads on ground response.

      PubDate: 2018-05-28T13:42:23Z
       
  • Evaluating random set technique for reliability analysis of deep urban
           excavation using Monte Carlo simulation
    • Abstract: Publication date: August 2018
      Source:Computers and Geotechnics, Volume 100
      Author(s): Ehsan Momeni, Mehdi Poormoosavian, Amir Mahdiyar, Ali Fakher
      Over the last few years, the importance of non-deterministic techniques in Geotechnical engineering is highlighted in literature. Random set (RS) theory is recently being utilized for reliability analysis of geotechnical problems, however, its application in deep urban excavation is not yet investigated for a real case study. Hence, in this paper, an attempt is made to investigate the feasibility of the RS method in determining the reliability of deep excavations. For this reason, a 27-meter-deep urban excavation in Tehran, Iran is considered as a case study. The excavation is numerically modelled. Subsequently the reliability analysis is performed. Findings indicate that the probability of collapse of excavation is as low as 10−7 which suggests that the project is safe against collapse. The aforementioned conclusion is confirmed when RS results were compared with site observation. Additionally, RS results were evaluated using Monte Carlo (MC) technique. Although further studies for more real case studies are recommended, good agreement between the results of MC and RS methods suggests the feasibility of RS technique for estimating the reliability of deep urban excavations.

      PubDate: 2018-05-28T13:42:23Z
       
  • Numerical study of frost heave behavior in U-elbow of ground heat
           exchanger
    • Abstract: Publication date: July 2018
      Source:Computers and Geotechnics, Volume 99
      Author(s): Youtang Wang, Yongqi Liu, Kun Yang, Peng Sun
      In cold regions, the soil frost heave around the U-elbow can become a key factor in its structural stability. The aim of this study is to develop a numerical model to investigate the frost heave behavior of U-elbow under low temperature (below 0 °C). The numerical model is verified with experimental date. In this study, the frost heave behavior of soil and U-elbow pipe are analyzed. It can be found that the ice content and soil stress show nonuniform distribution around the U-elbow in freezing area. Affected by the unbalanced frost heave action, the U-elbow shows continuous displacement and elliptical deformation.

      PubDate: 2018-05-28T13:42:23Z
       
  • A new and reusable foundation solution for onshore windmills
    • Abstract: Publication date: July 2018
      Source:Computers and Geotechnics, Volume 99
      Author(s): Wael Mohamed, Per-Erik Austrell, Ola Dahlblom
      A new foundation solution using a cellular raft with an active stabilisation system is proposed in this work. A comparative study of the new foundation and a traditional raft is performed. This study focuses on comparing the load capacity of the mentioned foundation solutions. The results illustrate that a cellular raft with an active stabilisation system gives a substantial enhancement of the load capacity compared to a traditional circular raft. Also, reusing the new foundation solution will provide a significant reduction of the carbon dioxide emissions comparing to the complete dismantling of the existing foundation and building a new one.

      PubDate: 2018-05-28T13:42:23Z
       
  • Extended Rigid Body Spring Network method for the simulation of brittle
           rocks
    • Abstract: Publication date: July 2018
      Source:Computers and Geotechnics, Volume 99
      Author(s): Leandro L. Rasmussen, Márcio M. de Farias, André P. de Assis
      In this paper, the Rigid Body Spring Network method is extended in order to provide for a realistic representation of the fracturing processes of brittle rocks. To achieve this objective, three new contributions are given to the method: a Cohesive Zone Model; a representation of rock heterogeneity; and the consideration of preexisting natural microcracks. In order to verify the competence of the contributions proposed, a case study is presented based on a granite rock. Conventional laboratory tests are numerically performed and the results are compared to those obtained in laboratory in order to show the performance of the proposed model.

      PubDate: 2018-05-28T13:42:23Z
       
  • Performance of micropiled rafts in clay: Numerical investigation
    • Abstract: Publication date: July 2018
      Source:Computers and Geotechnics, Volume 99
      Author(s): A.M. Alnuaim, M.H. El Naggar, H. El Naggar
      The micropiled raft (MPR) offers an efficient foundation system that combines the advantages of micropiles and piled rafts that can be used as primary foundation system or to enhance an existing raft foundation. In this paper, a finite element model (FEM) calibrated and verified with centrifuge tests was used to carry out a numerical investigation on the performance of MPR in clay. A total of 26 different cases were analyzed in this study to assess the behaviour of MPR in clay taking into account a number of factors that may influence its behaviour such as: the number of micropiles (MPs), the spacing to micropile diameter (S/Dmp), the raft thickness, and type of loading. The outcomes of this investigation should help in understanding the effect of these factors on the MPR axial stiffness, including; differential settlement; load sharing between the MPs and the raft; the raft bending moment and micropiles skin friction. Moreover, the ability of the Poulos-Davis-Randolph (PDR) method to evaluate the axial stiffness of a MPR for the preliminary design stage is examined. It was found that the MPR system can increase the tolerable bearing pressure by 100% compared to an isolated raft system. In addition, an adjustment factor (ωPR) for PDR method was introduced to account for the raft flexibility. Equations were proposed in order to design MPR systems in terms of load sharing between micropiles and the raft.

      PubDate: 2018-05-28T13:42:23Z
       
  • 3D finite elements modelling of percussive rock drilling: Estimation of
           rate of penetration based on multiple impact simulations with a commercial
           drill bit
    • Abstract: Publication date: July 2018
      Source:Computers and Geotechnics, Volume 99
      Author(s): Timo Saksala, Marion Fourmeau, Pascal-Alexandre Kane, Mikko Hokka
      This paper deals with assessing the rate of penetration (ROP) in percussive drilling of rock based on finite element simulations. For this end, a method to simulate the dynamic indentation in percussive drilling is developed and validated. This method includes a recently developed constitutive model to describe the rock fracture and a bit-rock interaction model. The constitutive model has a viscoplasticity part to indicate the stress states leading to rock fracture and a damage model with separate damage variables for tension and compression to quantify the rock fracture. In the numerical examples, the present approach is validated by simulations of the dynamic Brazilian disc test and dynamic indentation simulations on Kuru granite. The multiple consecutive impacts simulations carried out show that the present continuum approach is able to predict the experimental ROP. However, a close match of the experimental ROP requires that the critical damage threshold values, beyond which a damaged element contributes to the volume of removed material, are selected by the experiments. In any case, the present modelling approach, along with the procedure to convert the simulation results into ROP, provides a tool for improving the performance of percussive drilling equipment.

      PubDate: 2018-05-28T13:42:23Z
       
 
 
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