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  Subjects -> ENGINEERING (Total: 2279 journals)
    - CHEMICAL ENGINEERING (191 journals)
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    - ELECTRICAL ENGINEERING (101 journals)
    - ENGINEERING (1203 journals)
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ENGINEERING (1203 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     Full-text available via subscription   (Followers: 5)
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: 222)
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: 4)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 5)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 4)
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: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 20)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 24)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 40)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 37)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 29)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
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: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
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: 9)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 7)
Applied Network Science     Open Access  
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: 4)
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: 7)
Arid Zone Journal of Engineering, Technology and Environment     Open Access  
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
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: 8)
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: 3)
Batteries     Open Access   (Followers: 4)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
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: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 9)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
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: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 3)
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  
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: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 41)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
Case Studies in Thermal Engineering     Open Access   (Followers: 3)
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: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
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: 21)
Clay Minerals     Full-text available via subscription   (Followers: 9)
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: 4)
Coatings     Open Access   (Followers: 3)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
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: 25)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 256)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 181)
Composites Part B : Engineering     Hybrid Journal   (Followers: 227)
Composites Science and Technology     Hybrid Journal   (Followers: 169)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 13)
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: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 28)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 10)
Computing and Visualization in Science     Hybrid Journal   (Followers: 5)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 29)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 8)
Control Engineering Practice     Hybrid Journal   (Followers: 41)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access  

        1 2 3 4 5 6 7 | Last

Journal Cover Bulletin of Engineering Geology and the Environment
  [SJR: 0.525]   [H-I: 35]   [3 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  [2345 journals]
  • Geological characteristics of landslides triggered by the 2016 Kumamoto
           earthquake in Mt. Aso volcano, Japan
    • Authors: Kun Song; Fawu Wang; Zili Dai; Akinori Iio; Osamu Osaka; Seiji Sakata
      Abstract: On 16 April 2016, a Mw 7.0 earthquake occurred in Kumamoto city, Japan. The main shock induced two large landslides, namely the Aso Bridge landslide and the Aso Volcanological Laboratory landslide. Their topographical and geological conditions and motion features were investigated by using an unmanned aerial vehicle (UAV) and portable dynamic cone penetration tests (PPTs). The Aso Bridge landslide lies between elevations of 385 m and 725 m, with a total estimated volume of about 1,980,000 m3. The main body is composed of cohesive soil with lapilli and block. The Aso Volcanological Laboratory landslide lies on a slope between 483 m to 582 m, and the total volume is about 81,000 m3, with an average thickness of 4.5 m. The main body is composed of Kusasenrigahama volcanic pumice tephra beds. The material compositions and deposits of both landslides have low cohesion and easily induced shear failure for the two landslides. The sliding distance of the Aso Bridge landslide was long, the sliding direction almost unchanged from the scarp to the toe, and the sliding speed was rapid. The sliding distance of the Aso Volcanological Laboratory landslide, however, was short, the sliding direction changed from the N-direction at the scarp to the NW-direction at the toe, and the sliding speed was slow.
      PubDate: 2017-06-20
      DOI: 10.1007/s10064-017-1097-1
       
  • Optimization of diamond wire cutting performance in travertine quarrying
    • Authors: Mohammad Javad Rahimdel; Raheb Bagherpour
      Abstract: Diamond wire cutting is the most common method used for rock block production in quarry mining. This paper aimed to investigate the effect of operational conditions on the cutting performance of diamond wire. These operational conditions included pullback amperage, diamond bead density, the distance between cutting machine and working face, and also the number of required cutting surfaces. The effect of these factors was studied in different rock block sizes at a travertine mine in Iran; then the optimum cutting rates of the wire machine were examined in each condition. The results of this study showed that there was a significant direct relationship between the pullback amperage and the cutting rate of large surfaces. However, the relationship between the pullback amperage and the cutting rate of small surfaces was strongly indirect. Fair-large blocks with the cutting surface of 50 to 70 m2 had the highest cutting rate and the lowest specific bead consumption, as compared to the other block sizes. The optimum number of diamond beads in the unit length of the wire, for all cutting surfaces, was recommended to be 31. Also, the optimum distance between the cutting machine and the working faces for small, medium and large sizes of cutting surfaces was proposed to be 3, 3.5, and 4 m, respectively.
      PubDate: 2017-06-20
      DOI: 10.1007/s10064-017-1084-6
       
  • Lateral instability and tunnel erosion of a submarine pipeline:
           competition mechanism
    • Authors: Yu-min Shi; Fu-ping Gao
      Abstract: In submarine geological and hydrodynamic environments, either tunnel erosion or lateral instability could be initiated where there is a shallowly embedded pipeline. Unlike previous studies on the tunnel erosion of sand and the lateral instability of pipelines, in this study we performed correlation analyses on the competition mechanism for these two physical processes. By correlating the critical flow velocities of these two processes, the instability envelope for the pipe–soil interaction system is established, which can be described using three key parameters: the embedment-to-diameter ratio, the dimensionless submerged weight of the pipe, and the corresponding critical flow velocity. The analysis procedure is further proposed to first determine the instability mechanism and then the critical velocity of ocean currents. Our parametric study indicates that tunnel erosion is more prone to emerging than lateral instability with small embedment-to-diameter ratio values. With increasing pipeline embedment, tunnel erosion can be suppressed and lateral instability therefore occurs more frequently. Moreover, for light pipelines, lateral instability is more likely to be triggered than tunnel erosion.
      PubDate: 2017-06-20
      DOI: 10.1007/s10064-017-1073-9
       
  • Laboratory test on crack development in mudstone under the action of
           dry-wet cycles
    • Authors: Ming Hu; Yuanxue Liu; Jianbo Ren; Runze Wu; Yu Zhang
      Abstract: Rock masses in southwest China are dominated by alternating layers of sandstone and mudstone. When exposed to natural conditions, mudstone is vulnerable to disintegration, causing the overlying sandstone to be extremely likely to collapse under the action of a load or other conditions. An effective and innovative experimental method to characterize weathering processes would contribute to collapse prevention. In this study, a customized test unit, including a model test container, a lever-loading device and a thermostat-controlled heating plate, was applied to explore the mechanism of crack development in mudstone over multiple dry-wet cycles. The crack width, vertical displacement and wetted area were measured to analyse the slaking mechanism acting during these cycles. The results show that tiny cracks appeared on the surface of the sample after heating and that the vertical displacement increased in the upward direction because of swelling of mudstone. The crack width expanded with increasing water exposure, but after the water infiltrated the surface of the sample, the crack width decreased. The external surface of the sample was gradually infiltrated in the second dry-wet cycle, and the infiltration area increased continually. The infiltrating speed grew progressively faster with each cycle, and the number and size of internal cracks monotonically increased. The sample fractured as a result of crack extension. These results have theoretical significance regarding the ground collapse of alternating layers of sandstone and mudstone.
      PubDate: 2017-06-20
      DOI: 10.1007/s10064-017-1080-x
       
  • Estimation of petrographic factors of Deccan basalt using
           petro-physico-mechanical properties
    • Authors: M. Ahmad; M. K. Ansari; Rajesh Singh; L. K. Sharma; T. N. Singh
      Abstract: Basaltic rocks of the Deccan Traps are the major aggregate sources in Western India, and quarrying of these rocks has been ongoing in several quarries for many decades. The aggregate is the major component of the construction material. Therefore, quality assessment of aggregates by various physico-mechanical tests is essential. Many classification systems have been proposed for rocks/aggregates based on petrographic factors (PF). PF is defined by a range of values which indicate the quality of rock in term of excellent, good, fair and poor. However, PF depends upon the physical characteristics of the rock and geological characteristics of the particular area. The present study is the evaluation of rocks based on petro-physico-mechanical characterizations of the aggregate before the start of quarrying. To evaluate PF of aggregate, petrographic examination including visual and microscopic observations together with physico-mechanical tests, such as water absorption, point load index, slake durability index and impact strength index. Furthermore, a modified classification system was proposed for the PF of different basaltic rocks of the Deccan Traps which includes an equation based on the importance of above-mentioned parameters.
      PubDate: 2017-06-19
      DOI: 10.1007/s10064-017-1061-0
       
  • Characteristics of soft marine clay under cyclic loading: a review
    • Authors: Qing Yang; Yubin Ren; Jinglin Niu; Kuang Cheng; Yuxia Hu; Yin Wang
      Abstract: Soft clay forms a big proportion of the seabed ground. In a marine environment, waves, wind, and earthquakes, often known as cyclic loads, are a main contributor to the loading of the seabed. The safety of offshore structures relies on the response of soft marine clay to these cyclic loadings. Its very fine-grained composition, and hence low permeability, is the defining factor for soft marine clay showing a very different response to cyclic loading than sand. The responses of soft marine clay subjected to cyclic loading range from degradation in soil strength and stiffness to principal stress rotation, excess pore pressure generation, and deformation accumulation. These dynamic characteristics of soft marine clay are strongly influenced by several factors, including loading level (amplitude, frequency, and number of cycles), loading history, and path. The purpose of the present paper is to present an overview of the research results on the characteristics of soft marine clay under cyclic loading in the past decades. Some remarks on future research for improving the understanding of dynamic characteristics of soft marine clay are also provided based on the results of up-to-date research.
      PubDate: 2017-06-17
      DOI: 10.1007/s10064-017-1078-4
       
  • Residual factor as a variable in slope reliability analysis
    • Authors: Gautam Bhattacharya; Robin Chowdhury; Subhadeep Metya
      Abstract: In the past, residual factor R in strain-softening soil slopes has been included, either directly or indirectly, as a deterministic variable in both deterministic and probabilistic studies. This paper discusses the uncertainties associated with R and outlines a systematic approach for the reliability analysis of a natural slope in which shear strength parameters and pore pressure ratio are random variables, each assumed with a lognormal probability distribution. For the residual factor R, seven probability distribution options under the generalized beta-distribution system are considered. Slope reliability is computed based on the first order reliability method (FORM) and validated against Monte-Carlo simulation (MCS). Results obtained from two illustrative examples indicate that the probability of failure, with R as one of six random variables, can be orders of magnitude higher than that based on five random variables with R considered as a deterministic parameter. The magnitude of influence of R as a random variable is, however, highly dependent on its probability distribution, the left-skewed triangular distribution having the most significant influence in both the examples. Results of sensitivity analyses reveal that, for almost all of its assumed probability distributions, R is the most dominant among the six random variables. Effects of variation of some of the statistical and correlation properties of the other random variables, viz. the shear strength parameters and the pore pressure ratio, on the results of reliability analyses are also studied.
      PubDate: 2017-06-15
      DOI: 10.1007/s10064-017-1085-5
       
  • Experimental investigation of fractal dimension effect on deformation
           modulus of an artificial bimrock
    • Authors: Saeed Mahdevari; Parviz Moarefvand
      Abstract: Due to urbanization, construction of civil structures and infrastructure within complex rocks such as conglomerate and mélange is inevitable. Such rocks normally represent very heterogeneous structures. Obtaining representative undisturbed sample of these rocks is cumbersome and the estimation of their geological and geomechanical parameters is, therefore, very challenging. In the literature, such heterogeneous rocks, which are an assortment of rock blocks surrounded by a weaker fine matrix, are called block in matrix rocks (bimrocks). In the present study, the function of fractal dimension, volumetric block proportion (VBP), and largest block size in the bimrock’s deformation modulus are investigated through fabricating large-scale physical specimens and performing laboratory tests. Outcomes of the study revealed that the deformation modulus of physical samples increases with the increase of VBP and the reduction of the fractal dimension. The deformation modulus of physical specimens including coarse aggregate is also more than that of fine aggregates and the difference between them is enhanced with the reduction of the fractal dimension. A new factor called block contact coefficient is introduced to explain the variations in the deformation modulus. Results of the analysis also show that the strength reduction rate in the post-peak region increases with enhancing VBP, and it is less affected by fractal dimension and the largest block size.
      PubDate: 2017-06-13
      DOI: 10.1007/s10064-017-1074-8
       
  • Random field-based regional liquefaction hazard mapping — data inference
           and model verification using a synthetic digital soil field
    • Authors: C. Hsein Juang; Mengfen Shen; Chaofeng Wang; Qiushi Chen
      Abstract: Geostatistical tools and random field models have been increasingly used in recent liquefaction mapping studies. However, a systematic verification and assessment of random field models has yet to be taken, and implications of various random field-based mapping approaches are unknown. In this paper, an extremely detailed three-dimensional synthetic digital soil field is artificially generated and used as a basis for assessing and verifying various random field-based models for liquefaction mapping. Liquefaction hazard is quantified in terms of the liquefaction potential index (LPI), which is mapped over the studied field. A classical CPT-based liquefaction model is adopted to assess liquefaction potential of a soil layer. Different virtual field investigation plans are designed to assess the dependency of data inference and model performance upon the level of availability of sampling data. Model performances are assessed using three information theory-based measures. Results show that when sampling data is sufficient, all random field-based models examined capture fairly well the benchmark liquefaction potentials in the studied field. As the size of the sampling data decreases, the accuracy of predictions decreases for all models but to different degrees; the three-dimensional random field model gives the best result in this scenario. All random field-based models examined in this paper yield a slightly more conservative prediction of liquefaction potential over the studied field.
      PubDate: 2017-06-13
      DOI: 10.1007/s10064-017-1071-y
       
  • Low friction coefficient (approximately tan1°) of subaqueous debris flow
           in rotating flume tests and its mechanism
    • Authors: Jianliang Deng; Xiangxia Zhang; Shuilong Shen; Junichi Koseki
      Abstract: To reproduce a subaqueous debris flow with a friction coefficient of approximately tan1° in field, material with a huge volume may be involved. In this research, a steady subaqueous debris flow with a friction coefficient of approximately tan1° was produced by using the rotating flume experiment apparatus (Debris Flow Maker, DFM) with only 40 g of silicon powder. Subsequently, the mechanism of the low friction coefficient was interpreted with the hypothesis of dense agglomeration hitting (DAH). DAH means hitting of the dense agglomeration of dense flow on the flume's bottom plane. The following issues on DAH are considered: (I) the high velocity of the flume's bottom plane induces a strong hitting of particles; (II) the hitting elevates the liquid pressure near the boundary between the agglomeration and the flume's bottom plane; (III) the energy loss due to collision inside the particle agglomeration is limited. The experimental results provide an alternative method of producing subaqueous debris flow and an alternative measurement method of its friction coefficient; the hypothesis provides an alternative interpretation on the mechanism of low friction coefficient of subaqueous debris flow.
      PubDate: 2017-06-10
      DOI: 10.1007/s10064-017-1081-9
       
  • Evaluation of an enhanced FS method for finding the initiation time of
           earthquake-induced landslides
    • Authors: Guan-Wei Lin; Ching Hung; Huei-Sian Syu
      Abstract: In this paper, an examination of an enhanced FS method used for finding the initiation time of earthquake-induced landslides is presented. Validation was conducted via comparisons between the predicted and reported results of a benchmark site subjected to two major earthquake events: at Chi-Chi in 1999 (7.6 Mw) and Meinong in 2016 (6.4 Mw). To further validate the applicability of the ground motions utilized in this study, a finite element analysis was also carried out. Based on the results, satisfactory agreement between the predictions obtained by the enhanced FS method and the observed results in terms of the landslide initiation time was realized. Conclusions drawn from the study show that (a) the enhanced FS method can be both efficient and practical in finding the likely initiation time of a landslide, and it was found that the initiation time of the Tsaoling landslide during the Chi-Chi earthquake lay between 37.5 and 38.5 s; (b) when validating the enhanced FS method, the friction angle of 38.5o obtained from direct shear tests rather than a smaller value of 20.8o obtained from rotary-shear high-velocity friction experiments, led to a more appropriate results; and (c) the failure surface obtained by finite element codes was satisfactory when compared to the observed result.
      PubDate: 2017-06-09
      DOI: 10.1007/s10064-017-1083-7
       
  • The quantification of total and effective porosities in travertines using
           PIA and saturation-buoyancy methods and the implication for strength and
           durability
    • Authors: Ahmad Zalooli; Mashala Khamehchiyan; Mohammad Reza Nikudel
      Abstract: The porosity of travertine controls its strength characters and durability. In this study, seven travertine samples were collected from mines in Iran. The saturation-buoyancy (SB) method was used to determine density, water absorption by weight, effective porosity, and total porosity. Petrographic image analysis (PIA) was applied to measure total porosity. Uniaxial compressive strength (UCS) of travertine samples was obtained under both oven-dried and saturated conditions. The results showed that mean PIA total porosity of samples is 2–4 times more than total porosity obtained from the SB method. The underestimation of total porosity by SB method was attributed to pores type and pores size. According to regression analyses, the UCS shows a better correlation with SB effective porosity than SB total porosity. Based on results, water absorption by weight has a large impact on UCS of travertines. The SB effective porosity shows high correlation with water absorption by weight. There is a good power relation between PIA total porosity and UCS of travertines.
      PubDate: 2017-06-09
      DOI: 10.1007/s10064-017-1072-x
       
  • A GIS-based quantitative geo-environmental evaluation for land-use
           development in an urban area: Shunyi New City, Beijing, China
    • Authors: Mei Dong; Hui Hu; Riqing Xu; Xiaonan Gong
      Abstract: Urbanization is considered high priority in China. The present study focuses on a novel Geographical Information System-based approach to quantitatively assess the geo-environmental conditions for sustainable land-use development of an urban area. Fuzzy theories with analytic hierarchy processes are the most commonly used tools for land-use suitability evaluation. In fuzzy theories, a pattern recognition model is one of the tiny minority of models which can quantify the result. However, the key challenge is to provide each influencing factor with a quantitative value and selecting an approriate model to calculate the site’s adaptability for different infrastructures. The present study first proposes an approach coupling geostatistical analysis with three-dimensional visualizing technology to establish a reliable geological structural and high-precision informative geotechnical model to comprehensively understand the subsurface conditions of the research area. Then, an approach which uses an improved fuzzy pattern recognition method combining reliable geotechnical parameters to evaluate the geological environment is conducted. The weighting of each influencing factor in the final result is determined by an analytic hierarchy process. Finally, a zoning map of site adaptability is formed in the Geographical Information System for guiding land-use development. The study area is one of the most promising areas for urban and economic as well as airport developments in China, which is located on the northeast of Capital Beijing. This area may face several geo-environmental problems that will limit its suitability for infrastructure projects. The resultant models demonstrate the appropriate application of the presented methodologies. The quantified evaluation of the geo-environment could be combined with other conditions to provide decision-makers with improved reasonable land-use suitability scenarios.
      PubDate: 2017-06-09
      DOI: 10.1007/s10064-017-1069-5
       
  • Runout analysis of a potential debris flow in the Dongwopu gully based on
           a well-balanced numerical model over complex topography
    • Authors: Xudong Han; Jianping Chen; Peihua Xu; Cencen Niu; Jiewei Zhan
      Abstract: Debris flows could cause large amounts of damage in the alluvial fan where many houses and transport infrastructures exist. Thus, runout analysis of potential debris flows in these areas is necessary for protecting human lives, houses and infrastructure. Currently, the numerical simulation method is an effective way to intuitively display the runout of a potential debris flow. In this paper, a well-balanced finite volume scheme over complex topography was employed for studying the runout of a potential debris flow in the Dongwopu gully. Through model testing and validation, the numerical model had a good potential to adapt to the complex topography and could reasonably simulate the runout of debris flow events. Then, runout distance and inundation path, as well as flow depths and flow velocities, for the potential debris flow were obtained using the model. The simulation results appropriately reflected the runout characteristics.
      PubDate: 2017-06-07
      DOI: 10.1007/s10064-017-1079-3
       
  • Numerical analysis of hard rock blasting unloading effects in high in situ
           stress fields
    • Authors: Si-You Xiao; Li-Jun Su; Yuan-Jun Jiang; Zhi-Xiang Liu
      Abstract: Blasting in high in situ stress fields is different from blasting at the earth’s surface because of the dynamic unloading effect in the former. In order to study the coupling of dynamic loading and dynamic unloading in the blasting process, the explicit finite element method and explicit-implicit finite element method are employed respectively to investigate the influence of high stress on blasting effects. The results show that the stress and strain change rules of the two methods are clearly different. The stress and strain change rates calculated by the explicit-implicit algorithm simulation are greater than the results simulated by the explicit finite algorithm. The radius of the blasting cavity calculated by the explicit-implicit finite element method is 0.015 m larger than that of the explicit finite element method. Based on the results of the explicit finite element method, a theoretical model is also established, which helps to clarify the effects of high in situ stress unloading when blasting in a high in situ stress field. The model shows that the maximum tensile radial displacement caused by high in situ stress dynamic unloading at the edge of the blasting cavity is 0.12 mm, and the dynamic unloading radial tensile effect can lead to rock failure. This research illustrates that high stress has a considerable influence on the blasting process and on rock-breaking effects. According to the findings, certain blasting engineering design suggestions are made.
      PubDate: 2017-06-06
      DOI: 10.1007/s10064-017-1067-7
       
  • Landslide characterization and distribution in northern Ethiopia: a case
           study from the Adishu area
    • Authors: Kassa Amare; Gebreslassie Mebrahtu; Assay Gebremiceal
      Abstract: Landslides have resulted in large numbers of casualties and huge economic losses in the hilly and mountainous areas of the Ethiopian highlands. Adishu (Adi-Quchi and Quilet villages in particular) is one of the areas most highly affected by rainfall-driven landslides. Field investigations of this area have revealed displacement of 204 people, destruction of 56 rural houses and 5 km of rural roads, and effects on 58 ha of agricultural land due to landslides. In addition, a significant proportion of the population still lives in a terrain potentially endangered by landslides. The geology of the study area consists of Antalo limestone, Agula shale, Amba-Aradom sandstone, basalt flows, and unconsolidated sediments. Thirteen major landslides with clear downthrown head scarps and downspread toes were identified. Inventory of landslides was based on the interpretation of aerial photographs, topographic maps, satellite images, and field identifications, with the aim to assess the cause and type of landslides in the study area. The different methods applied to soils and rocks included the direct shear test, Schmidt hammer, and inverse auger hole methods. The results revealed that soil materials in the area have a low permeability (1.22 × 10−6–3.13 × 10−6 m/s), a high plasticity index (17.2–29.4), and cohesion values ranging between 10 and 26 kN/m2. Soil samples from the stable in situ layers showed relatively high cohesion and relatively small internal angle of friction compared to the residual layer. The common types of landslides in the study area were rock falls, rock topples, debris/earth flows, and debris/earth slides accompanied by translational and rotational sliding mechanisms. These landslides could be classified into three zones based on location, type of failure, mode of failure, and direction of failure. The upper layers of basalt and limestone rocks showed significant percolation and recharge to the downslope layer (marl-shale). We therefore concluded that the marl-shale layer is mainly responsible for sliding, whereby percolated and recharged water cause saturation and the development of pore water pressure in this layer due to its imperious nature. The Qulate (landslide zone one and zone two) and Adi-Quchi (landslide zone three) localities are highly affected areas where there are unconsolidated soil deposits underlain by marl-shale along the streams due to removal of underlying and lateral support by gully erosion.
      PubDate: 2017-06-06
      DOI: 10.1007/s10064-017-1064-x
       
  • The influence of flowing water coupling condition on the result of rock
           mass acoustic test
    • Authors: Wenbo Lu; Yuzhu Zhang; Peng Yan; Ming Chen; Gaohui Wang; Zhendong Leng; Haoran Hu
      Abstract: Control of blasting induced damage zone is one of the important topics in hydropower project construction, and the acoustic test method is commonly used to discriminate the blasting induced damage zone. However, the acoustic test results are usually affected by the geological conditions of the test site. During the traditional process of the acoustic test, water is usually injected into the test hole as a coupling agent. However, when the rock mass is abundant in joints, water leakage will appear, and thus the coupling water is in a flowing state. A large number of measured data indicate that when coupling water is in a flowing state during the acoustic test, the quality of the measured acoustic waveform will be worse than that in still water coupling, especially at the take-off point of the first waveform. The experiment results show that the acoustic waveform deterioration is mainly influenced by low-frequency interference, which is produced by pulsating pressure induced by flowing water. Furthermore, when the acoustic wave data is influenced by low-frequency interference caused by flowing water coupling, the take-off point of the first waveform will be more obvious while the acoustic wave data is filtered with appropriate frequency; as a result, the readability of the data will be enhanced and the accuracy of the acoustic test will be improved.
      PubDate: 2017-06-05
      DOI: 10.1007/s10064-017-1049-9
       
  • High-level and long-term noise effect on soft rock building materials
    • Authors: Adil Binal
      Abstract: In recent years, due to an increase in the number of tourists and music concerts in historical areas and a rise in the noise level caused by transport in these regions, an increase in noise-induced damage has been seen in historic structures. In the literature, few studies have examined the impact of sound sources on old buildings. In this study, two types of ignimbrite from the Cappadocia region, fossiliferous limestone used in historical Ottoman buildings, mudstone from the Kula Geopark area, and sandstone used in historic buildings in Erzurum were tested at different sound levels to determine the effect of noise on the rock samples. A new laboratory test setup was developed for noise-effect testing. The rock samples were placed in the sound-test cabinet and exposed to sound levels of 80–130 dB at 1–1200 min duration. Changes in the sonic velocity, porosity, water absorption by weight, and uniaxial compressive strengths of the samples were measured, as well as the deformation caused by the sound waves on the surface of the samples. At 80 dB, the surface of the mudstone samples began to disperse. Above 120 dB, small cracks occurred on the surfaces of all the samples.
      PubDate: 2017-06-05
      DOI: 10.1007/s10064-017-1077-5
       
  • Influence of petroleum on the failure pattern of saturated pre-cracked and
           intact sandstone
    • Authors: Haiqing Yang; Junfeng Liu; Louis Ngai Yuen Wong
      Abstract: Failures of the surrounding rock mass have been identified as the most serious threat to the stability of underground water-sealed petroleum storage depots. To elucidate the effects of petroleum on the deformation and failure patterns of sandstone, a series of uniaxial compression experiments have been conducted. The experimental results show that the strength of intact sandstone is enhanced with increasing immersion time in petroleum. However, for the pre-cracked specimen, the failure is strongly influenced by pre-existing flaws, and the fracturing degree is aggravated due to the immersion in petroleum, as stress concentration at a high level will form at the tips of a pre-existing flaw. Coupled with the lubrication action of petroleum between the fracture faces, cracks may initiate and propagate more readily. In addition, failures of splitting-shearing mixed mode, splitting mode and shearing mode take place corresponding to the three flaw angles (30°, 45°, 60°) involved in the experiment. Furthermore, for the flaw inclination of 45°, the failure mode transforms from splitting mode into splitting-shearing mixed mode when the arrangement of flaws is changed from rectangular to diamond. A discussion over experimental phenomenon is provided at the end of each section. The investigation provides further understanding of the failure mechanism of sandstone under the long term coupled influence of water and petroleum.
      PubDate: 2017-06-02
      DOI: 10.1007/s10064-017-1075-7
       
  • Development of a 3D structural model of a mine by consolidating different
           data sources
    • Authors: M. Morales; K. K. Panthi; K. Botsialas; K. H. Holmøy
      Abstract: Joints and faults are inherent parts of the rock mass. In the vast majority of mining slopes, discontinuity structures play an important role in slope stability and may trigger a slope failure. The most important step in understanding the slope failure mechanism is to have a reliable model, which shows how all the discontinuity sets are constituted in the rock mass and how they interact with each other. However, building a fracture model is not a straightforward process, since it needs to combine discontinuity information from a variety of sources, such as detailed slope mapping, borehole logging data and remote sensing technologies. Hence, this manuscript attempts to develop a comprehensive structural model of the complete mine area in an open pit, which is the biggest in Norway with respect to its depth and area of coverage. The manuscript demonstrates on how it is possible to consolidate information from different sources in order to identify typical orientation of the detailed fractures that are associated with the main structural lineaments. The process involves analysis of different sources of data in order to correlate this information into useful evidence about the orientation of the fracture systems in terms of dip and dip direction. Further, the mine is divided into different structural domains and a 3D structural model is developed. As an end result, the domains are kinematically tested with respect to different types of failure modes in both overall slope and bench slope scale of the mine for both a hanging wall and foot wall. It is highlighted here that the results presented in this manuscript are the part of the research project called “Decisive Parameters for Open Pit Slopes (DePOPS)”.
      PubDate: 2017-05-31
      DOI: 10.1007/s10064-017-1068-6
       
 
 
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