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  Subjects -> ENGINEERING (Total: 2312 journals)
    - CHEMICAL ENGINEERING (196 journals)
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    - ELECTRICAL ENGINEERING (104 journals)
    - ENGINEERING (1213 journals)
    - ENGINEERING MECHANICS AND MATERIALS (389 journals)
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    - MECHANICAL ENGINEERING (93 journals)

ENGINEERING (1213 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Hybrid Journal   (Followers: 7)
AASRI Procedia     Open Access   (Followers: 15)
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: 254)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
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: 6)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 3)
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: 6)
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: 16)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 11)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 22)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 27)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 10)
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: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 40)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 2)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 32)
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: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 17)
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: 8)
Annals of Science     Hybrid Journal   (Followers: 7)
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: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 1)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
Applied Sciences     Open Access   (Followers: 2)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
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: 24)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
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: 4)
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: 14)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 18)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 34)
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: 14)
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: 30)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 44)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Thermal Engineering     Open Access   (Followers: 4)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
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   (Followers: 1)
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: 1)
CienciaUAT     Open Access  
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: 14)
City, Culture and Society     Hybrid Journal   (Followers: 24)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
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: 27)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 271)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 199)
Composites Part B : Engineering     Hybrid Journal   (Followers: 257)
Composites Science and Technology     Hybrid Journal   (Followers: 194)
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: 7)
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)
Corrosion Series     Full-text available via subscription   (Followers: 6)
CT&F Ciencia, Tecnologia y Futuro     Open Access   (Followers: 1)

        1 2 3 4 5 6 7 | Last

Journal Cover Bulletin of Engineering Geology and the Environment
  [SJR: 0.525]   [H-I: 35]   [14 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1435-9537 - ISSN (Online) 1435-9529
   Published by Springer-Verlag Homepage  [2355 journals]
  • Landslide susceptibility of the Xiangjiaba Reservoir area associated with
           the Yaziba Fault
    • Authors: Aijuan Liu; Lu Zheng; Jianhui Deng; Yiming Huang
      Pages: 1 - 11
      Abstract: Landslides along active fault zones are important hazards during and after earthquakes. They can also cause secondary disasters such as surges, creation of landslide dams, and flooding, especially in reservoir areas. This study analyzed landslide susceptibility of the Xiangjiaba Reservoir area associated with the Yaziba Fault. Analysis of permanent displacement and failure probabilities were used for the regional assessment. Ground motion attenuation relations were selected and compared to produce a peak acceleration map using the Yaziba Fault as the seismic source. Geotechnical parameters were determined by classification of rock groups and geomorphic data were calculated using GIS tools. A distribution of the permanent displacements and a failure probability map was generated. According to the peak ground acceleration (PGA) map, the C-B model was adopted to present the actual conditions of PGA in greater detail while local specific models are more appropriate if there is little measured data. Results indicated larger displacement values and failures are distributed on both sides of the fault, especially in the hanging wall. The feasibility of the research approach was verified using historic earthquake-induced landslides.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-017-1053-0
      Issue No: Vol. 77, No. 1 (2018)
       
  • Debris flow hazard assessment by combining numerical simulation and land
           utilization
    • Authors: Jun Wang; Shun Yang; Guoqiang Ou; Qinghua Gong; Shaoxiong Yuan
      Pages: 13 - 27
      Abstract: Debris flow has caused serious human casualties and economic losses in the main earthquake-hit areas affected by the Wenchuan earthquake. As one of the important and effective means of non-engineering disaster mitigation, debris flow hazard assessment is a key issue for the sustainable economic and social development of earthquake-hit areas. This article illustrates a new method to quantify the debris flow hazard by combining debris flow simulated results with different land utilization within the influence area. The Guo Juanyan gully in Dujiangyan city, Sichuan province, China, located in the meizoseismal area of the Wenchuan earthquake, was selected as the study area. The rainfall characteristics, including the rainfall pattern and the 10-min, 1-h, and 24-h critical rainfalls, were fully explored first. Then, the numerical simulation method was applied as a modeling tool to simulate debris flow influence area and final buried depth under rainfall with different return periods. The simulated results under a 100-year return period rainfall were validated based on field measurements. Finally, the debris flow hazard maps under different return periods were overlapped by combining the simulated results and the types of land utilization. The proposed method can enhance the accuracy of debris flow hazard assessment and can be widely used for debris flow mitigation, which has important application value.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-017-1006-7
      Issue No: Vol. 77, No. 1 (2018)
       
  • Back analysis of an ancient rockslide at Lake Fundudzi, Limpopo Province,
           South Africa
    • Authors: S. G. Chiliza; E. D. C. Hingston
      Pages: 29 - 47
      Abstract: A massive rockslide occurred in the Soutpansberg Mountains of the Limpopo Province ~20,000 years ago that blocked the course of the eastern flowing Mutale River forming Lake Fundudzi, which is the only known true inland lake in South Africa. The landslide occurred in the northwestward dipping and highly jointed Fundudzi Formation of the Soutpansberg Group. The failed slope was observed to be a homogenous jointed sandstone rock slope which is quartzitic in places. Cluster analysis, which uses fuzzy clustering in Rocscience Dips, revealed three major joint sets (JS1, S0 and JS3) in the rock mass with an average dip and dip direction of 85°/237°, 15°/283° and 73°/157°, respectively. The main failure plane best correlated with JS3, which dips towards the lake. The kinematic analysis also revealed that the mechanism of failure was planar which is in agreement with site observations. The strong rock material classification of the sandstone from a laboratory index and mechanical tests was one of the indicators that failure could have been mostly structurally controlled. The technique of back-analysis was employed using RocPlane in order to investigate the geotechnical conditions that may have resulted in failure. The results obtained from the sensitivity analysis in RocPlane showed that the joint roughness coefficient (JRC) followed by the residual basic friction angle (ϕ r) were the main influential shear strength parameters on the factor of safety, F, as opposed to the joint wall compressive strength (JCS) which has very little impact on F for the range of values considered. Results from back-analysis show a range of possible combinations of JRC and ϕ r values under different groundwater and seismic conditions. Whilst the groundwater shows more impact than the seismic coefficient, the field evidence points to seismic activity as a more plausible trigger than groundwater. This study shows the usefulness of back-analysis techniques in assessing various conditions of failure that may have resulted in ancient rockslides. Although it may not result in a unique set of geotechnical parameters that may have resulted in failure, it, however, gives an insight into probable causes of failure and, thus, can be useful in mitigation of future failures.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-1001-4
      Issue No: Vol. 77, No. 1 (2018)
       
  • Identifying the influences of geological factors on reservoir bank
           collapse by a model test
    • Authors: Feng Ji; Changjiang Liu; Huixing Zhou; Haiming Liu; Yi Liao
      Pages: 127 - 139
      Abstract: Reservoir bank collapse, which strongly influences the relocation area when water is impounded, is currently an important topic in reservoir engineering. In this work, a series of orthogonal experiments was carried out to analyze, from among the many factors that can affect bank collapse width (BCW), the effects on BCW of slope angle, material grain-size diameter, degree of density of material, wave height of reservoir water, and water level fluctuation. A detailed analysis of each parameter is presented, and the analysis of range (ANORA) calculated. The results of the study show that the most sensitive factor affecting BCW is slope angle, followed by density degree, clay proportion, wave height, and water level. Finally, a prediction formula was established based on the physical simulation experiments, and its scope of applicability is discussed. These research results provide a reliable basis for future bank collapse studies.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-0951-x
      Issue No: Vol. 77, No. 1 (2018)
       
  • In situ determination of hydraulic conductivity in Yangtze Delta deposits
           using a modified piezocone model
    • Authors: Mingfei Zhang; Liyuan Tong; Yijun Yang; Hongbo Che; Huangsong Pan
      Pages: 153 - 164
      Abstract: In order to more precisely determine the in situ hydraulic conductivity of soils as an essential parameter in geotechnical engineering, this article presents a new method based on piezocone tests. In light of results obtained from a series of classical numerical simulations of piezocone dissipation tests and in situ tests, the modified direction and value assumptions of excess pore water pressure distribution are fundamental: (1) the flow surface of pore water is assumed to be cylindrical in shape at larger scales, and (2) the initial state of induced excess pore pressure is assumed to satisfy a negative exponential distribution in dissipating. After detailing the existing approaches, a comparison of data in the Yangtze Delta region between them and the proposed method based on graphical and statistical analysis has been accomplished; the comparison revealed the accuracy and validity of the proposed method, with five indices utilized, including a new relative error index. The reasonable assumptions, logical derivation and mathematical analysis together indicate the academic value and application potential of the proposed method.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-0968-1
      Issue No: Vol. 77, No. 1 (2018)
       
  • Changes in chemical composition and engineering properties of gypseous
           soils through leaching: an example from Mashhad, Iran
    • Authors: Somaye Asghari; Mohammad Ghafoori; Sayed Salman Tabatabai
      Pages: 165 - 175
      Abstract: Gypseous soils are considered problematic when used as the foundation in civil engineering structures such as roads, buildings and dams, due to their solubility. These soils are resistant and have good engineering properties in their dry state. However, when saturated by rainwater or a rising groundwater table, the soluble minerals are washed out, resulting in the subsidence of the structures built on them. In the recent decades, buildings constructed in the Southern Mashhad Metropolitan Area, Iran, have been widely faced with this problem. Since the changes in chemical composition and engineering properties of these soils are based on the amount of dissolved gypsum, the focus of this study is to characterize the soluble soils of this area and their changes throughout the leaching process. Thirty-eight samples were taken from different locations in the area. Chemical tests were conducted on the samples and the gypsum and sulfate concentration maps were produced based on these results, combined with the previously available data from 511 boreholes drilled in the area. Seven soil samples with different gypsum concentrations were selected for further analysis in four major groups of tests, including hydraulic tests (permeability and solubility), chemical tests (chemical analysis of soils samples and total dissolved solids, calcium hardness and chlorine of the leachate samples), physical tests (grain size analysis, Atterberg limits and specific gravity) and mechanical tests (consolidation and direct shear). Changes in the mentioned parameters were investigated through a 5-day leaching process. The results indicate that extensive dissolution of gypsum and removal of gypsum bonding between soil particles change soil chemical composition and decrease the soil compressibility and strength parameters. Therefore, the structures built in this area are in high risk of subsidence and foundation failure; proper measures should be taken to improve the soil quality before construction.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-017-1076-6
      Issue No: Vol. 77, No. 1 (2018)
       
  • Comprehensive critical mechanical model of covered karst collapse under
           the effects of positive and negative pressure
    • Authors: Wei YongYao; Sun ShuLin
      Pages: 177 - 190
      Abstract: Three different processes of karst collapse under the effects of positive and negative pressure are discussed in this paper. The aim is to evaluate mechanisms of karst collapse. Critical mechanical models are established for each of three specific stages: arched holes in soil, vertical collapse of columns, and surface funnel-shaped collapse. Then, a comprehensive critical mechanical model of covered karst collapse under the effect of positive and negative pressure is developed. This was created based on Boyle’s law of gases. A method has been developed that provides a theoretical reference for quantifying early warnings of karst collapse. This procedure is based on fundamental coincidences between the physical situation and a check analysis. This is made by integrating the monitored results of an established karst water and gas pressure monitoring system into the output of a comprehensive critical mechanical model of covered karst collapse, which is affected by positive and negative pressures.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-0995-y
      Issue No: Vol. 77, No. 1 (2018)
       
  • Predicting earthquake-induced soil liquefaction based on a hybridization
           of kernel Fisher discriminant analysis and a least squares support vector
           machine: a multi-dataset study
    • Authors: Nhat-Duc Hoang; Dieu Tien Bui
      Pages: 191 - 204
      Abstract: Assessment of the earthquake-induced liquefaction potential is a critical concern in design processes of construction projects. This study proposes a novel soft computing model with a hierarchical structure for evaluating earthquake-induced soil liquefaction. The new approach, named KFDA-LSSVM, combines kernel Fisher discriminant analysis (KFDA) with a least squares support vector machine (LSSVM). Based on the original data set, KFDA is used as a first-level analysis to construct an additional feature that best represents the data structure with consideration of different class labels. In the next level of analysis, based on such additional features and the original features, LSSVM generalizes a classification boundary that separates the learning space into two decision domains: “liquefaction” and “non-liquefaction.” Three data sets of liquefaction records have been used to train and verify the proposed method. The model performance is reliably assessed via a repeated sub-sampling process. Experimental results supported by the Wilcoxon signed-rank test demonstrate significant improvements of the hybrid framework over other benchmark approaches.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-0924-0
      Issue No: Vol. 77, No. 1 (2018)
       
  • Investigation of correlations between shear wave velocities and CPT data:
           a case study at Eskisehir in Turkey
    • Authors: Muammer Tun; Can Ayday
      Pages: 225 - 236
      Abstract: Seismic waves result from fault movement during earthquakes. Depending on the features of the physical environment through which they pass, there are variations in the velocity and amplitude of body waves, which occur underground, and surface waves, which occur on the Earth’s surface. The ratio of shear wave velocity (V s) to near-surface velocity is a parameter used widely in land use planning to predict the potential for amplified seismic shaking, especially in urban areas. The main objective of this study was to estimate V s by using cone resistance (q c) and lateral friction (f s) for a study area at Eskisehir Graben, to help mitigate geotechnical earthquake engineering problems in civil engineering and land use planning. In geotechnical shallow soil research, certain geophysical methods are used for measuring V s —a major form of seismic energy propagation—at the near surface. In this study, cone penetrometer data collected from seismic cone penetration tests (SCPT) includes q c, f s, and downhole V s. S-type seismic energy waveforms, which are produced on the surface, were measured at different depths using an S-type geophone in the city center of Eskisehir via SCPT. With SCPT, q c, friction ratios (R f), and V s values were measured at 42 different test points. R f properties are associated with soil thickness, and these were compared with dynamic soil properties (V s) using a standard statistical method; we calculated correlations amongst V s, q c, and R f measured from cone penetration tests.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-0987-y
      Issue No: Vol. 77, No. 1 (2018)
       
  • Characterization of building stones from the ancient Tyana aqueducts,
           Central Anatolia, Turkey: implications on the factors of deterioration
           processes
    • Authors: Mustafa Korkanç
      Pages: 237 - 252
      Abstract: Many archaeological and historical monuments constructed by different civilizations over the last 5500 years can be observed in the Niğde region located in central Anatolia. The Tyana aqueduct as a continuation of the Roman Pool is one such important historical monument. The aqueducts that carried the water of the Roman Pool to the ancient city of Tyana were constructed during the time of the Roman emperors Trajan, Hadrian and Marcus Aurelius Antoninus. Half of the total length of the aqueducts (3 km) is on the surface and the rest is buried. The engineering properties of the rocks used in such archaeological and historical buildings are very important in terms of conserving these structures for future generations. In this study, the geomechanical and geotechnical features of the Tyana aqueducts were investigated to understand the rock types, deterioration in the stones over time and problems originating from these features. Also, for restoration purposes, the ancient stone quarry areas for the aqueducts were identified, and the chemical, petrographical and geomechanical properties of fresh travertine blocks from these quarries were determined. The main rock type used as building stones in the aqueducts is Mio-Pliocene travertine. Laboratory studies were performed to determine the mineralogical, petrographic and petrophysical properties of the building stone samples. Fresh and used travertine samples were composed exclusively of calcite crystal. The results of chemical analyses were similar for fresh and used travertine samples. To determine the geomechanical properties of the travertines, dry unit weight, water absorption, effective porosity, P-wave velocity, Böhme abrasion test, capillary water absorption and uniaxial compressive strength experiments were conducted. In addition, Schmidt hammer hardness measurements were performed on site for the different levels and different textural characteristics of the belts on the travertines. According to the experimental data obtained, higher strength was displayed by samples with fine grains, massive texture and low porosity. The deterioration effects in most of the travertines used in the original structure are very low. In addition to human effects, the use of small stone dimensions (especially the stones used in belts as keystones) and the use of stone from the same quarry but with features that differ or are inferior are thought to be factors in the destruction of the Tyana aqueducts.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-0930-2
      Issue No: Vol. 77, No. 1 (2018)
       
  • Fuzzy approach for preliminary design of weak rock slopes in lignite mines
    • Authors: Ahmet Gunes Yardimci; Celal Karpuz
      Pages: 253 - 264
      Abstract: Rock slope failure modes are either driven by structurally controlled mechanisms (planar, wedge, or toppling failure) or lean upon the highly jointed or weak rock mass (circular failure). Developing practical tools for preliminary slope design is a popular topic among geotechnical society. This study proposes a practical methodology to predict a safe overall slope angle for weak rock slopes of lignite mines. Rock mass rating (RMR) and slope mass rating (SMR) classification systems can be remarkably misleading for weak rocks. Fuzzy modification was proven to improve rock and slope quality predictions. In addition, structurally controlled failures can be estimated more precisely. Later, a popular slope performance chart of Bieniawski that is based on RMR was modified by the fuzzy approach, and the computer models of a weak rock mass failure in a Turkish lignite mine are presented. The modified methodology was proven to be better suited to the weak rock conditions.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-017-1022-7
      Issue No: Vol. 77, No. 1 (2018)
       
  • Effects of a controlling geological discontinuity on the seismic stability
           of an underground cavern subjected to near-fault ground motions
    • Authors: Zhen Cui; Qian Sheng; Xianlun Leng
      Pages: 265 - 282
      Abstract: The mechanism for the influence of near-fault ground motion on seismic issues for underground rock caverns has seldom been addressed, especially for caverns controlled by large geological discontinuities. In this paper, a nonlinear joint model was used to simulate the effects of unfavorable geological discontinuities under seismic excitation. The influence of near-fault ground motion on unfavorable geological discontinuities was analyzed using a large sample of ground-motion records collected from the NGA-West2 database. A damage potential index (DPI) for unfavorable geological discontinuities was proposed and discussed. The #1 surge chamber of the Baihetan Hydropower Plant, which is dominated by interlayer shear weakness zone (ISWZ) C2, was used as a study case to investigate the differences between pulse-type near-fault ground motion, non-pulse-type near-fault ground motion, and far-field ground motion. The results of the study indicate that (1) significant velocity and displacement as well as a stronger long-period response spectrum are key characteristics of pulse-type near-fault ground motions, whereas non-pulse-type near-fault ground motions display characteristics similar to those of far-field ground motions; (2) the velocity pulse is responsible for the destructive capabilities of near-fault ground motions; (3) the peak ground velocity (PGV) was shown to be the most suitable DPI of several ground-motion parameters for large geological discontinuities under seismic excitation (applicable to both near-fault and far-field ground motions); and (4) PGV was verified to be the most effective DPI for ISWZ C2 at the Baihetan #1 surge chamber. The cavern became fragile when subjected to near-fault ground motions, so special seismic reinforcement measures are recommended. These findings may provide a reference for the seismic design of underground caverns.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-0936-9
      Issue No: Vol. 77, No. 1 (2018)
       
  • Anisotropic mechanical behaviors of columnar jointed basalt under
           compression
    • Authors: Changyu Jin; Shengang Li; Jianpo Liu
      Pages: 317 - 330
      Abstract: Columnar jointed basalt is a typical type of jointed rock mass formed by the combined cutting effect of primary joints and aphanitic fissures and exhibits highly anisotropic mechanical behaviors in terms of strength and deformation modulus. In order to understand the anisotropic mechanical properties of columnar jointed basalt, a series of laboratory tests and numerical simulations were carried out. Firstly, a mixture of water, river sand, and gypsum was prepared to model the columnar jointed basalt. A series of uniaxial compression tests were then conducted according to the different cooling times and prefabricated dip angles (α = 0°–90°). The model test results reveal that the strength and deformation modulus of columnar jointed basalt are obviously affected by the primary joint angles, and the deformation modulus and the peak strength of columnar jointed basalt under uniaxial compression are correlated with the dip angles of primary joints by a U-shaped curve. The deformation modulus and the peak strength reach the minimum when the joint angle is in the range of 60°–75°. A multi-jointed softening constitutive model was the established based on the results of model tests. The 3DEC software was adopted to simulate the uniaxial compression tests. The simulation results are in agreement with the test results, demonstrating the rationality of the numerical method proposed in this paper. Lastly, the triaxial compression tests on columnar joints under different confining pressures were modeled. The modeling results indicate that, with the presence of confining pressure, the similar material exhibits different mechanical properties, such as elastic–plastic and elastic–brittle behaviors, under different primary joint angles. The primary joints are the predominant factor affecting the anisotropy of the similar material. By comparing the normalized indexes, it is found that increasing confining pressure can effectively reduce the effect of columnar joints on the anisotropy of mechanical properties of rock masses.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-0942-y
      Issue No: Vol. 77, No. 1 (2018)
       
  • Model tree approach for predicting uniaxial compressive strength and
           Young’s modulus of carbonate rocks
    • Authors: Ebrahim Ghasemi; Hamid Kalhori; Raheb Bagherpour; Saffet Yagiz
      Pages: 331 - 343
      Abstract: The uniaxial compressive strength (UCS) and Young’s modulus (E) of rock are important parameters for evaluating the strength, deformation, and stability of rock engineering structures. Direct measurement of these parameters is expensive, time-consuming, and even infeasible in some circumstances due to the difficulty involved in obtaining core samples. Recently, soft computing tools have been used to predict UCS and E based on index tests. Most of these tools are not as transparent and easy to use as empirical regression-based models. This study presents another soft computing approach—model trees—for predicting the UCS and E of carbonate rocks. The main advantages of model trees are that they are easier to use than other data learning tools and, more importantly, they represent understandable mathematical rules. In this study, the M5P algorithm was employed to build and evaluate model trees (UCS and E model trees). First, the models were developed in an unpruned form, and then they were pruned to avoid overfitting. The data used to train and test the model trees were collected from quarries in southwestern Turkey. Model trees included Schmidt hammer, effective porosity, dry unit weight, P‐wave velocity, and slake durability index as input variables. When the models were assessed using a number of statistical indices (RMSE, MAE, VAF, and R 2), it was found that unpruned and pruned model trees provide acceptable predictions of UCS and E, although the pruned models are simpler and easier to understand.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-0931-1
      Issue No: Vol. 77, No. 1 (2018)
       
  • A new rock creep model based on variable-order fractional derivatives and
           continuum damage mechanics
    • Authors: Hao Tang; Dongpo Wang; Runqiu Huang; Xiangjun Pei; Wenling Chen
      Pages: 375 - 383
      Abstract: The creep model is the main form of rock model used to describe the rheological behavior of rocks. A large number of creep models have been proposed, but many are complicated and/or are not able to fully simulate the three stages of rock creep. Hence, an important focus of research on rock creep has been to develop a model with few parameters and better simulation performance. To achieve this, in this study, we propose a new four-element creep model, based on variable-order fractional derivatives and continuum damage mechanics. The newly proposed creep model agrees well with experimental data for Changshan rock salt. The results show that the segmentation treatment is an effective approach for simulating the creep behavior of rocks.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-0992-1
      Issue No: Vol. 77, No. 1 (2018)
       
  • Swelling laws for clay-sulfate rocks revisited
    • Authors: Christoph Butscher; Simon Breuer; Philipp Blum
      Pages: 399 - 408
      Abstract: The swelling of clay-sulfate rocks is a major threat in tunnel engineering and in the installation of shallow geothermal systems. It can cause serious damage to tunnels and buildings; and produce high additional costs during tunnel construction and operation. The swelling may result in a heave of the tunnel invert, destruction of the lining or uplift of the entire tunnel section. Heave–pressure–time relations are therefore needed in order to predict the mechanical behavior of swelling rock as a basis for an optimal tunnel design. The present study revisits different stress–strain relations (“swelling laws”) for swelling clay-sulfate rocks proposed by various authors. Published laboratory data from oedometric swelling tests are presented that may confirm the proposed stress–strain relationships. These data are re-examined by testing each of the different data sets with the different proposed relations. One main outcome of this study is that different interpretations of stress–strain data are possible and none of the swelling laws proposed in the literature could be generally confirmed or rejected. We conclude that a generally valid swelling law in the form of a stress–strain relation does not yet exist. A promising approach to describe the swelling behavior of clay-sulfate rocks, however, is process-based numerical modeling, which is also briefly introduced in this study.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-0986-z
      Issue No: Vol. 77, No. 1 (2018)
       
  • Remote monitoring for a high-speed railway subgrade structure state in a
           mountainous area and its response analysis
    • Authors: Jian Li; Shanxiong Chen; Fei Yu; Zhangjun Dai
      Pages: 409 - 427
      Abstract: High-speed railway engineering in mountainous areas suffers from occasional poor geological conditions, rugged topography, and complex hydrographic conditions. It is an important means of ensuring its safe operation to conduct real-time remote monitoring and analysis of the subgrade structure condition. Through analysing the stress characteristics of the mountainous subgrade, a complete monitoring system has been built and a corresponding software platform for datum acquisition and analysis has also been developed. After selecting a typical mountainous high-speed railway subgrade located in Hunan Province as the test section, the real-time monitoring of the subgrade structure in a static settling period, joint commissioning period, and an operational period was conducted and the primary condition datum was obtained. It is found that the dynamic response parameters have relatively slow attenuation velocities and the influencing depth of the high-speed train loads was about 4–5 m; when the structural state of the mountainous subgrade is healthy, subgrade deformations are small and, compared with the dynamic response datum of the subgrade in plain areas, the dynamic response of the mountainous high-speed railway subgrade was consistent. However, the long-term dynamic response and deformation of such mountainous subgrades still needs to be monitored, and analysed, continually.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-016-0965-4
      Issue No: Vol. 77, No. 1 (2018)
       
  • Investigation of spatial variability of SPT data in Mashhad City (NE Iran)
           using a geostatistical approach
    • Authors: Sepideh Nasseh; Naser Hafezi Moghaddas; Mohammad Ghafoori; Omid Asghari; Jafar Bolouri Bazaz
      Pages: 441 - 455
      Abstract: Precisely investigating subsurface conditions is a major concern for both geotechnical and geological engineers. In recent years, growing urbanization and construction of high-rise buildings in Mashhad City, Iran, have increased the demand for 3D models as a basis for subsurface characterization. In this regard, this study deals with the development of a 3D geological engineering model for standard penetration test (SPT) results on Mashhad City sedimentary deposits using sequential indicator simulation (SIS) and sequential Gaussian simulation (SGS) approaches. Reliable estimation of SPT values can be helpful in prediction of other geotechnical properties such as soil strength parameters and bearing capacity. The intense variability of the Mashhad sedimentary basin gives rise to complex and challenging ground conditions for civil engineering work. A better understanding of these deposits is crucial for many current and future civil engineering projects. Since design parameters in the study area are usually determined based on SPT results, 12,440 SPT data collected from 1380 boreholes were employed as the input data. After variability analysis, the SIS procedure was applied to coded data to determine areas with very dense sediments (areas with SPT > 50). Then, data with SPT values < 50 were transformed into normal scores in order for them to be applicable as input data in SGS. Finally, coupled maps showing the results of these two approaches were provided for different depths.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-017-1136-y
      Issue No: Vol. 77, No. 1 (2018)
       
  • Geological parameters in relation to bedrock geology and shear strength of
           dry tills: samples from the southern half of Norway
    • Authors: Øystein Lid Opsal; Jørgen Mathias Langeland
      Abstract: The shear strength of soils is influenced by various geological parameters. Following the shear strength study of Norwegian tills by Opsal (2017), this study presents test results of a selection of such parameters, i.e., particle size distribution, particle shape, and the mineralogical composition, of 33 till samples (fractions <16 mm) from 6 rock provinces in the southern half of Norway. The mutual correlations between the geological parameters and their correlations to dry till shear strength have been investigated. The results are generally in accordance with expectations regarding the relation of such geological parameters to bedrock geology. The results also indicate that the till shear strength is not specifically governed by one geological parameter, but rather by an interaction of all the parameters combined. Particle size distribution and mineralogical composition are found to relate to the angle of friction, while particle shape is considered to influence the initial shear resistance and may thus be of special importance regarding the potential initiation of debris slides and flows in the respective provinces.
      PubDate: 2018-02-03
      DOI: 10.1007/s10064-018-1236-3
       
  • Dynamical process of the Hongshiyan landslide induced by the 2014 Ludian
           earthquake and stability evaluation of the back scarp of the remnant slope
           
    • Authors: Hai-Bo Li; Xiao-Wen Li; Yu Ning; Shu-Fang Jiang; Jia-Wen Zhou
      Abstract: Reinforcing a landslide dam and converting a landslide-dammed lake to a hydraulically engineered lake is a sound means to address this natural disaster. The Hongshiyan landslide-dammed lake reconstruction project provides an excellent example. However, the stability of the remnant slope is crucial to the reconstruction of this project. It is essential to analyse the formation failure mechanisms of the Hongshiyan landslide and evaluate the stability of the remnant slope. Combined with field investigations and unmanned aerial vehicle (UAV) 3D image technologies, the failure mechanisms of the Hongshiyan landslide and the stability of the remnant slope were qualitatively studied and discussed. The dynamic process and failure mechanism of the Hongshiyan landslide are significantly different to conventional landslides. The dynamic process of the Hongshiyan landslide can be divided into three stages: time-dependent deformation stage, earthquake-induced failure stage and an unloading recovery stage. The failure mechanism can be summarised as follows: tension–crush–shattering–sliding. The stability conditions of the remnant slope are worse than those of conventional landslides under the same conditions. Toppling and small collapse are possibly occurring at the back scarp of the remnant slope because of the steep slope gradient, well-developed tension fractures and frequent occurrence of aftershocks and rainstorms. Based on the density, opening degree, porosity and connectivity of the cracks, as well as instability risk probabilities, the rock mass of the back scarp of the remnant slope can be divided into three zones: the seismically damaged zone, the unloading damaged zone and the stable zone. To guarantee the safety of the remnant slope and reduce secondary earthquake or rainstorm disasters, corresponding comprehensive treatment measures must be taken to ensure long-term stability.
      PubDate: 2018-02-01
      DOI: 10.1007/s10064-018-1233-6
       
 
 
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