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  Subjects -> ENGINEERING (Total: 2298 journals)
    - CHEMICAL ENGINEERING (192 journals)
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ENGINEERING (1209 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: 251)
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: 17)
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: 26)
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: 26)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 30)
Advances in Operations Research     Open Access   (Followers: 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: 41)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
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: 5)
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: 7)
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: 23)
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: 7)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 1)
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: 1)
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: 269)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 194)
Composites Part B : Engineering     Hybrid Journal   (Followers: 274)
Composites Science and Technology     Hybrid Journal   (Followers: 192)
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: 29)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 6)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
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: 32)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 7)
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]
  • Discussion of the pipe flow model to analyze the critical parameter of
           seepage erosion forming sinkholes in Liuzhou, China
    • Authors: Fuwei Jiang
      Abstract: Abstract On May 10th, 2012, 41 sinkholes collapsed the southern suburbs of Liuzhou, Guangxi Province, China, damaging 143 houses, eight factories buildings, and three commercial buildings. Lei (2013) revealed that groundwater dynamics, contributed to by the daily rainfall of 169.7 mm, led to soil particles running off (seepage erosion) resulting in the sinkholes. It is crucial to identify the critical parameters of seepage erosion that forms sinkholes. This paper analyzes critical parameters in the study site, establishes the pipe flow model of seepage erosion, and deduces parameter expression using its theories. We devised experimental equipment designed to simulate the process of seepage erosion and test the critical shear stress (τ cr ) of soil samples from the field. Additionally, we measured the diameter (d) of pores in the field soil using a scanning electron microscope, and calculated the critical groundwater velocity (V cr ). As the result, we found that the collapsed sinkholes in the study site were formed by groundwater with a velocity of 7.652 × 10−5 m/s (or 0.459 cm/min).
      PubDate: 2018-01-12
      DOI: 10.1007/s10064-017-1222-1
       
  • A giant historical landslide on the eastern margin of the Tibetan Plateau
    • Authors: Zili Dai; Fawu Wang; Qiangong Cheng; Yufeng Wang; Hufeng Yang; Qiweng Lin; Kongming Yan; Feicheng Liu; Kun Li
      Abstract: Abstract The Tibetan Plateau is a landslide-prone area in Southwest China. A large-scale ancient landslide named Luanshibao Landslide on the eastern margin of the Tibetan Plateau is described in this paper, based on field investigation and satellite image interpretation. The geological setting and morphometric properties of the landslide are presented. Especially, the hummocky landscape, a prominent feature in the deposit area, is described. The total run-out distance of this landslide is 3910 m and the maximum velocity is estimated to be 36.6 m/s. The angle of reach is analysed as the index expressing the mobility of the landslide. Its value is about 12 degrees, indicating the high landslide mobility. Field observation shows that this landslide was most likely triggered by an earthquake, and the seismic acceleration capable to induce this landslide is estimated to be 0.36 g. This landslide might have changed the course of the Litang River.
      PubDate: 2018-01-12
      DOI: 10.1007/s10064-017-1226-x
       
  • Landslides and natural dams in the Krathis River, north Peloponnese,
           Greece
    • Authors: V. Zygouri; I. K. Koukouvelas
      Abstract: Abstract Integral to the natural process of the earth’s surface geology, landslides serve to redistribute soil and sediments in a process that can be recognized in abrupt collapses or in slow gradual slides. In March 1913, a significant volume of rock debris collapsed from the footwall of an active fault in the Krathis River basin, located at the southern part of the Gulf of Corinth. It moved downslope at a speed of 60 km/h, destroying Sylivaina village, located between Akrata and Kalavrita in NE Achaia, and impounding two lakes within Krathis River basin as first mentioned in the local and national press. Almost 10 months after the landslide, newspapers of that period documented a massive flood event through overtopping and breaching of the in-stream lake. However, during the outburst flood event, the off-stream lake remained unaffected and is considered as being in equilibrium state. By integrating new and existing geomorphological, structural and geological information, we associate the 1913 landslide to recent tectonic activity and moderate earthquake activity, investigating the role of active faults in controlling the size, geographical distribution and clustering of landslides in the active range. The case of Krathis River damming is significant because it combines the creation of a natural dam and the catastrophically short-term outburst of the impoundment lake. Therefore, this case study is an optimal site for investigating landsliding and river damming in an area of high seismicity and steep morphology showing an abundance of recent and historical landslide failures.
      PubDate: 2018-01-12
      DOI: 10.1007/s10064-017-1225-y
       
  • Monitoring prediction of a rockslide in an open-pit mine and numerical
           analysis using a material instability criterion
    • Authors: Zhaohua Li; Yuanjun Jiang; Zhigang Tao; Manchao He
      Abstract: Abstract Although there have been rapid developments in the field of geomechanics and geotechnics in recent decades, understanding the instability mechanisms of geomaterials and the prediction of landslides remain worldwide problems. The objective of this study was to present a real rockslide prediction by a novel monitoring system and discuss a numerical approach as an assistant tool. On one hand, a real rockslide that occurred in an open-pit mine was monitored using a novel constant-resistance-large-deformation (CRLD) cable, and the successful prediction of a rockslide and evacuation of personnel and equipment were presented. On the other hand, the stability of the studied rock slope was controlled by a major fault. A material instability criterion was selected to analyze the failure of the major fault and the rockslide mechanism. Finally, the material instability criterion was implanted into the FLAC3D software, and the real rockslide was simulated and analyzed in the framework of the finite difference method. The failure of the major discontinuity was discussed, the numerical results were compared with the real case, and reasonable explanations were proposed.
      PubDate: 2018-01-08
      DOI: 10.1007/s10064-017-1224-z
       
  • A case study on the application of destructive and non-destructive methods
           for evaluating jet-grouting column integrity for bridge-pier scour
           protection (Cuneo, NW Italy)
    • Authors: Sabrina Bonetto; Chiara Colombero; Cesare Comina; Nicolò Giordano; Andrea Giuliani; Giuseppe Mandrone; Simone Nicola; Paolo Tible
      Abstract: Abstract A case study on the use of direct and indirect investigations for the effectiveness evaluation of jet-grouting interventions for bridge scour protection is presented. The major concern of this scour countermeasure is that a reliable verification and imaging of the exact dimensions and shape of the grouted elements and their related strength and integrity are difficult to obtain. An integrated cost-effective and slightly invasive approach, by means of indirect surveys, is proposed in this work to limit re-drilling and core sampling of jet columns. Tests are performed on a bridge located in the Province of Cuneo (NW Italy). On site, active fluvial activity was scouring four of the 19 bridge piers and jet-grouting interventions were designed to prevent bridge collapse. A dual approach was consequently applied to evaluate the goodness of jet-grouting treatments: results of direct tests (visual and mechanical characterization of core drillings, with Point Load and Uniaxial Compressive Strength tests) have been compared to indirect investigations (seismic down-hole tests and 2-D cross-hole tomography, laboratory Ultrasonic Pulse Velocity measurements). All the techniques showed potentiality in identifying variations of the jet-grouting properties within the columns. Generally, worsening in jet-grouting properties was coherently identified by a decrease in the seismic velocities and in the mechanical parameters and confirmed by visual inspection of core drillings. Local anomalies and discrepancies between the adopted method were however highlighted and critically discussed as a function of the limitations, disturbances and investigated volumes of each method.
      PubDate: 2018-01-06
      DOI: 10.1007/s10064-017-1223-0
       
  • Stability analysis of complex rock slopes reinforced with prestressed
           anchor cables and anti-shear cavities
    • Authors: Jinfeng Bi; Xianqi Luo; Haitao Zhang; Hui Shen
      Abstract: Abstract To evaluate the stability of reinforced complex rock slopes, an evaluation method for slope stability is proposed in this paper. In the proposed method, the force equilibrium of the potential slide mass is analyzed by treating the traction on the potential failure surface as an external force. The potential sliding direction is assumed to be the opposite direction of the resultant shear force on the potential failure surface, and the factor of safety is defined as the ratio of the available resisting force to the actual mobilized force. Through classic cases, the proposed method successfully predicts the stability of a slope critical to failure, and is compared with the traditional methods. Finally, the proposed method is used for a stability analysis of the left bank slope of the Jinping first stage hydropower station, considering two main reinforcing measures, prestressed anchor cables, and anti-shear cavities. Results indicate that the effects of the anti-shear cavities are more positively significant than the effects of the prestressed anchor cables. The safety factor is remarkably increased by the anti-shear cavities, which validates the importance of anti-shear cavities on slope stability.
      PubDate: 2018-01-04
      DOI: 10.1007/s10064-017-1171-8
       
  • Verifying the ground treatment as proposed by the Secondary Permeability
           Index during dam foundation grouting
    • Authors: Brendon R. Jones; J. Louis Van Rooy; Dawid J. Mouton
      Abstract: Abstract The Secondary Permeability Index (SPI) is a permeability-based rock mass classification, which when complemented with the degree of jointing can be employed as an approximation to the ground treatment design. However, when the grout mix and success of the grout operation are known, a back-analysis can be conducted to infer the degree of jointing. The aim of this paper is to back-analyse and verify the ground treatment as proposed by the SPI from water pressure tests conducted in primary production grout boreholes, at the De Hoop Dam in South Africa. The calculated SPI class, together with information obtained from detailed mapping of the foundation rock mass, is compared to the mix, the take, and the success of each of the primary production grout boreholes. Based on the success of the grout, a degree of jointing is assumed, which is evaluated and validated against the RQD values obtained from the exploratory investigation boreholes. Overall, the degree of jointing inferred from the success of the grout mix showed that most of the compared boreholes validated the ground treatment as suggested by the SPI. Successful thin mixes coincide with minor fault zones with or without dolerite intrusions, as well as very closely jointed gabbro bedrock, whilst unsuccessful thin mixes are associated with the contacts of dolerite intrusions, which are generally highly weathered and fractured. This is highlighted by the success of thick mixes when applied to these intrusions. Unsuccessful thick mixes are mostly attributed to major fault zones.
      PubDate: 2018-01-02
      DOI: 10.1007/s10064-017-1219-9
       
  • GIS-based landslide susceptibility mapping in the Safi region, West
           Morocco
    • Authors: Othmane Boualla; Khalid Mehdi; Ahmed Fadili; Abdelhadi Makan; Bendahhou Zourarah
      Abstract: Abstract This study aims to establish susceptibility maps for the Moroccan Safi region, which is affected by karstification processes. This process is the predisposing factor for various landslide types such as debris flows and rock falls. In the first phase of this study, a landslide inventory was prepared by geomorphological approach based on visual interpretation of aerial photographs combined with direct observations in the field. The obtained inventory included 234 landslides: 14 rock slides and 75 debris flows in Brown Clay Formation, 74 rock falls in sandstone and 71 rock topples in Dridrat Limestone Formations. The inventory map showed that landslide phenomena occur mainly in the northwest and along the active coastal cliffs in the south of Safi. In the second phase, four landslide susceptibility maps were realized using the bivariate statistical method of Geographical Information System (GIS) matrix method (GMM). The established landslide susceptibility maps were validated by the degree of fit method. Obtained results showed that landslide phenomenon occurs mainly in the northwest and along the coastal cliffs in the south of the study area. Moreover, very high and high susceptibility levels were limited to the area including industrial and touristic activities as well as historical monuments. Overall, landslides were associated to karstification, lithology, karstic rocks and karstic spring presence, which are considered as predisposing and causal factors.
      PubDate: 2017-12-26
      DOI: 10.1007/s10064-017-1217-y
       
  • The effect of wind pressure on surface erosion of soft rocks in arid
           regions
    • Authors: Adil Binal
      Abstract: Abstract The wind acts as a land-shaping agent in desert and coastal regions, with more significant effects on soft, porous rocks than on massive rock formations. Air-suspended particles degrade rock surfaces, form cavities, and produce drift channels; however, abrasions that have been formed without the impacts of suspended particles are occasionally observed on very soft rock surfaces in areas exposed directly to the wind. The effect of wind without abrasive particles on soft and porous rock samples was examined using a newly designed wind tunnel. Samples were exposed to various wind speeds of 6–9 m/s to determine the most efficient wind speed. Ignimbrite, mudstone and sandstone specimens, all of which possess high porosity and low strength, were tested in the wind tunnel under a constant air temperature for 1 year. During that time, changes in sample weight were measured at weekly intervals. The specimens started to decrease in weight after losing surface moisture, with the highest weight loss observed in the samples with high porosity and low strength. Air pressure from the wind caused tension on rock surfaces. Surface strain measurements were carried out to determine the effects of wind pressure on weight loss. The maximum strain (250 μ) was recorded on mudstone samples with high porosity and low strength. A good relationship was detected between surficial strain and weight loss. The air pressures on the sample surfaces caused by the wind forces were measured with a new sensor. The air pressure values measured on the surface oscillated between −56 and 133 Pa.
      PubDate: 2017-12-22
      DOI: 10.1007/s10064-017-1218-x
       
  • An investigation of the relationship between Los Angeles abrasion loss and
           rock texture for carbonate aggregates
    • Authors: Rassoul Ajalloeian; Mojtaba Kamani
      Abstract: Abstract Rock aggregates are the most fundamental material of highway, railroad, and other construction activities. The quality of rock aggregates for a given usage is determined by many different test methods, one of the most important of which is the Los Angeles abrasion (LAA) test as it is used to evaluate the resistance to abrasion and wear of aggregates for such applications as railroad ballast, base course material, and asphalt and concrete aggregates. In this study, the relationship between rock texture and LAA loss was investigated for 26 sources of carbonate aggregates found in Iran which constitute the most commonly quarried crushed rock. Regression analyses were used to determine whether rock texture was a useful predictor of LAA loss. The texture of rock aggregate was quantified by texture coefficient (TC), which can be used to put a value on rock texture with studies carried out on the rock thin section using image analysis. In addition, the effects of textural parameters including area weighting of grains or packing density, grain shape, grain elongation, circularity, and orientation of mineral grains, and also TC on the LAA loss were evaluated. Although the results show that weak relationships exist between textural parameters and LAA loss, a strong relationship exists between TC and LAA loss. The results indicate that many textural parameters, together with TC, can be interpreted as rock texture which influences the LAA loss. Also, the results indicate a strong negative correlation between LAA loss and TC, and can be used to predict LAA loss in practical applications.
      PubDate: 2017-12-20
      DOI: 10.1007/s10064-017-1209-y
       
  • Effects of variation in the particle size of the rock abrasion powder and
           standard rotational speed on the NTNU/SINTEF abrasion value steel test
    • Authors: Y. Majeed; M. Z. Abu Bakar
      Abstract: Abstract Ten potentially abrasive rock samples selected from various locations of Pakistan covering igneous, metamorphic and sedimentary rocks were subjected to a comprehensive laboratory testing program. The experimental work includes the NTNU/SINTEF abrasion value steel (AVS) and Sievers’ J-miniature drill (SJ) tests accompanied by CERCHAR and LCPC rock abrasivity tests. The results of SJ tests and AVS tests were further utilized to compute the cutter life index (CLI), which estimates the life of tunnel boring machine (TBM) disc cutter rings in boring hours. In this research, a comparative study was performed on an NTNU/SINTEF rock abrasivity device by varying the particle size of rock abrasion powder and rotational test speed of the steel disc. The NTNU/SINTEF AVS test results showed a gradual decrease in abrasivity with the corresponding decrease in grain size of test fractions. An increase in the wear of the test piece was observed at a test speed of 10 rpm as compared to the standard test speed of 20 rpm. Relevant correlations of CLI, SJ-value and AVS with CERCHAR abrasivity index (CAI) and LCPC abrasivity coefficient (ABR, g/t) were also discussed.
      PubDate: 2017-12-18
      DOI: 10.1007/s10064-017-1211-4
       
  • A multi-factor comprehensive risk assessment method of karst tunnels and
           its engineering application
    • Authors: S. C. Li; J. Wu
      Abstract: Abstract The tunnel collapse, a large deformation of surrounding rock, water and mud inrush are the main geological disasters in the process of tunnel construction. In order to control the above construction risks, the multi-factor comprehensive risk assessment method of karst tunnels is investigated in this study. Firstly, twelve influencing factors are selected as comprehensive risk assessment indexes of the karst tunnel from the aspects of karst hydrogeology and engineering geology conditions, as well as construction factors. The corresponding grading standards of assessment indexes are determined. The tunnel collapse, large deformation of surrounding rock, water and mud inrush, and comprehensive risk assessment index systems are established respectively. Secondly, the unascertained measure analysis for assessment indexes is carried out. The single risk grade and comprehensive risk grade are judged respectively by using credible degree recognition criteria. Thirdly, the most serious geological disaster is ascertained based on the riskiest principle, and then comprehensive risk control theories and technical systems of the karst tunnel can be built. Finally, the established unascertained measure model and the proposed multi-factor comprehensive risk assessment method are applied to the risk assessment of the Yichang-Wanzhou Railway Dazhiping tunnel. The assessment results are in good agreement with the site construction conditions. The research results provide an effective approach for comprehensive risk assessment methods of karst tunnels.
      PubDate: 2017-12-18
      DOI: 10.1007/s10064-017-1214-1
       
  • Characterizing groundwater flow in a translational rock landslide of
           southwestern China
    • Authors: Hongbin Lv; Chengpeng Ling; Bill X. Hu; Jiaxin Ran; Yanan Zheng; Qiang Xu; Juxiu Tong
      Abstract: Abstract Characterizing the groundwater flow pattern in a landslide would help to establish a monitor-warning system to predict the movement of a highly concealed and extremely hazard translational landslide. The complex fracture network in this type of landslide affects the rainfall infiltration process and the groundwater flow. In this paper, multi-tracer tests, injection tests and electrical resistivity tomography were used to investigate the hydrogeological characteristics and groundwater dynamics of the Kualiangzi translational rock landslide, which is located in the northeast of the Sichuan Basin, China. The study results indicate that there are two kinds of groundwater flow mode, in the landslide, the concentrated mode and the dispersed mode. Tracer and injection test results indicate that the groundwater flow in the landslide is mainly controlled by a vertical preferential flow pathway (concentrated mode), of which the direction is approximately perpendicular to the sliding direction of the landslide. The main runoff direction in the middle of this landslide is southwest according to electrical resistivity tomography. The hydraulic conductivity in the preferential direction is more than 3750 times larger than that perpendicular to the direction. The groundwater flow along the weathered sandstone and mudstone media in the vicinity of the slip surface is very slow (dispersed mode). The results reveal the existence of a preferential flow pathway. The hydrogeological conceptual model is considered as an unbounded domain with an anisotropic medium in the whole area. This hydrogeological model clearly describes the hydrological conditions, and can help establish a monitor-warning system in a translational landslide.
      PubDate: 2017-12-18
      DOI: 10.1007/s10064-017-1212-3
       
  • Shaking table test to assess seismic response differences between steep
           bedding and toppling rock slopes
    • Authors: Long-qi Li; Neng-pan Ju; Shuai Zhang; Xiao-xue Deng
      Abstract: Abstract In order to investigate the seismic response of steep bedding and toppling rock slopes, a large-scale shaking table test was performed taking into consideration a variety of factors such as slope type and input seismic excitation. Diverse seismic responses, including acceleration and earth pressure at several locations, were analyzed in terms of the test results. It was found that the slope type has a significant impact on the failure mechanism and response norm of different kinds of rock slopes. Firstly, the slide surface of the steep bedding rock slope is basically parallel to the slope surface, while that of toppling rock slope skews the rock layer under seismic load. The failure zone area of the toppling rock slope is smaller than that of the bedding rock slope, which is mainly because it consumes plenty of seismic energy to break through the rock layer of the toppling rock slope. In addition, for acceleration along the vertical direction, an abrupt amplifying effect exists at the top slope when the peak input motion acceleration (PIMA) exceeds a certain value: 0.6 g for a bedding rock slope and 0.4 g for a toppling rock slope. Meanwhile, for acceleration along the horizontal direction, the acceleration amplifying factors of toppling rock slopes are larger at the slope surface but smaller at the inner slope portion than that of bedding rock slopes. Furthermore, the acceleration amplifying factor is larger than the earth pressure amplifying factor at the slope surface. The earth pressure amplifying factor at the top surface for a toppling rock slope is close to that of a bedding rock slope with an increase in PIMA. This novel experiment reveals the different failure mechanisms between steep bedding and toppling rock slopes, as well as being of help to the conduct of further study on seismic hazard early warnings.
      PubDate: 2017-12-16
      DOI: 10.1007/s10064-017-1186-1
       
  • Estimation of empirical rainfall thresholds for landslide triggering using
           partial duration series and their relation with climatic cycles. An
           application in southern Ecuador
    • Authors: John Soto; José Antonio Palenzuela; Jorge P. Galve; Juan Antonio Luque; José Miguel Azañón; José Tamay; Clemente Irigaray
      Abstract: Abstract Rainfall-induced landslides constitute a major cause of damage and fatalities throughout the intramontane basins of the Andes. The geological and climatic setting plays a key role in the generation of a high number of landslides in this area. For this reason, a greater understanding of the relationship between landslide frequency and climate conditions is necessary to mitigate human and economic losses. Accordingly, this paper presents an analysis of rainfall variables associated with a series of dated landslides (153 in total) in the southern Ecuador basin of Loja. This analysis was performed by applying an affordable empirical method that enables the calculation of critical rainfall threshold (CRT) curves. This calculation is based on an in-depth examination of rainfall parameters, such as cumulative precipitation and mean intensity, linked to a wide range of rainfall duration (from 1 to 90 days). The inspection of these parameters was addressed considering their frequency, which was calculated by using partial duration series (PDS), taking into account the entire rainfall record. This work has revealed that only 24% of landslides were triggered by rainfall conditions with maximum return periods greater than 1 year, whereas the rest did not exceed that return period. After finding the best correlation between the maximum return periods and the maximum mean intensity, a minimum power law function was adjusted to the CRT curve that correlates duration and cumulative rainfall. The values for this CRT function resulted in 5.14 and 0.83 for its scaling constant (α) and shape parameter (β), respectively. In addition, a spectral analysis was conducted to detect climatic cycles on the entire rainfall record. In general, a clear correlation could not be established between climatic frequencies and significant rainfall events inducing landslides, although similarly return periods were found for a critical rainfall event of March 2015 (10.4 years) and the SUNSPOT cycles (10.5-12 years). The results derived from this research are significantly valuable for the prevention of future mass-movements, although additional data will be crucial to update and calibrate CRT curves to study the influence of climate on landslide event frequency and magnitude in Loja.
      PubDate: 2017-12-16
      DOI: 10.1007/s10064-017-1216-z
       
  • Stress ratio effect on fatigue life of tropically weathered rock
    • Authors: Nurul Ainain bt Mohd Salim; Zainab Mohamed; Mohamad Nor Berhan
      Abstract: Abstract This paper investigates the fatigue life of weathered granite and weathered sandstone using a stress ratio of R = 0.17. A small stress ratio is adopted to control data discrepancy between weathered rocks for which stress amplitude is known to affect the fatigue life. The range of varying static strength between weathered rocks, especially for highly weathered rock (grade IV) which has lower static strength, resulted in adopting this small stress ratio. The details of rocks tested, including microscopic petrographic characterization as well as their physical properties obtained from laboratory work, is also explained in this paper. Weathered rock specimens from slightly weathered to highly weathered (grade II, grade III and grade IV) granite and sandstone were used during the investigation. The specimens were representative of rock collected in Sungai Buloh (granite) and Puncak Perdana (sandstone) in Selangor, Malaysia. In order to eliminate the influence of frequency and waveform, all rock specimens (54 in total) were tested under a cyclic compression load with a frequency of 1 Hz using a constant sinusoidal waveform. Result shows that grade IV specimens are the least affected by the small cyclic stress ratio as compared to grade II and grade III specimens. The number of cycles to failure is not dependent on rock weathering grade; it is greatly related to the petrological and microstructure of the individual rock. However, the weathering degree of a rock does contribute to the weakening of the rock's structure, consequently affecting the life of the rock.
      PubDate: 2017-12-15
      DOI: 10.1007/s10064-017-1181-6
       
  • Non-dimensional analysis for rock slope plane failure in seismic
           (pseudostatic) conditions
    • Authors: Manuela Cecconi; Corrado Cencetti; Laura Melelli; Vincenzo Pane; Alessia Vecchietti
      Abstract: Abstract This study examines plane failure analysis of rock slopes and discusses its effect on seismic actions in a non-dimensional form, incorporating external loads transferred by anchors and stability indicators such as the depth of tension cracks and the failure plane dip. The results of limit equilibrium analyses, in terms of attained level of safety, are summarized in stability charts which can be used for design and assessment. Following guidelines established by Eurocode EC7, the stability is assessed through the R/E ratio, i.e. the ratio of the resisting shear forces (R) acting on the sliding surface and those promoting sliding (E). The proposed stability charts can be applied to various common practical situations, in order to provide a preliminary - but quantitative - assessment of the rock slope stability. As an example of an application, the paper focuses on the stability of a rock mass located at the bottom of the southern slope of the “Sasso di Pale” mountain (Central Italy), at the outskirts of the village of Pale. As many other historical towns in Central Italy, due to their location close to rock masses, this site is particularly exposed to instability phenomena such as plane failure and rock wedge failure. The structural-geological survey allowed us to identify the main joint sets affecting the behavior of the rock mass and, accordingly, we examined the plane failure mechanism involving sliding along a single plane. Stability verifications in pseudostatic conditions have been performed by adopting the proposed charts, consistent with Eurocodes prescriptions.
      PubDate: 2017-12-15
      DOI: 10.1007/s10064-017-1215-0
       
  • Proposing a new model to approximate the elasticity modulus of granite
           rock samples based on laboratory tests results
    • Authors: Katayoun Behzadafshar; Mehdi Esfandi Sarafraz; Mahdi Hasanipanah; S. Farid F. Mojtahedi; M. M. Tahir
      Abstract: Abstract An accurate examination of deformability of rock samples in response to any change in stresses is deeply dependent on the reliable determination of properties of the rock as analysis inputs. Although Young’s modulus (E) can provide valuable characteristics of the rock material deformation, the direct determination of E is considered a time-consuming and complicated analysis. The present study is aimed to introduce a new hybrid intelligent model to predict the E of granitic rock samples. Hence, a series of granitic block samples were collected from the face of a water transfer tunnel excavated in Malaysia and transferred to laboratory to conduct rock index tests for E prediction. Rock index tests including point load, p-wave velocity and Schmidt hammer together with uniaxial compressive strength (UCS) tests were carried out to prepare a database comprised of 62 datasets for the analysis. Results of simple regression analysis showed that there is a need to develop models with multiple inputs. Then, a hybrid genetic algorithm (GA)-artificial neural network (ANN) model was developed considering parameters with the most impact on the GA. In order to have a fair evaluation, a predeveloped ANN model was also performed to predict E of the rock. As a result, a GA-ANN model with a coefficient of determination (R2) of 0.959 and root mean square error (RMSE) of 0.078 for testing datasets was selected and introduced as a new model for engineering practice; the results obtained were 0.766 and 0.098, respectively, for the developed ANN model. Furthermore, based on sensitivity analysis results, p-wave velocity has the most effect on E of the rock samples.
      PubDate: 2017-12-08
      DOI: 10.1007/s10064-017-1210-5
       
  • Developing a novel model for predicting geomechanical features of
           carbonate rocks based on acoustic frequency processing during drilling
    • Authors: M. Yari; Raheb Bagherpour; M. Khoshouei
      Abstract: Abstract The drilling operation is one of the significant phases in geosciences. Analyzing this function assists investigators to determine the correct standpoint on the drilling process itself. The drilling operation generates acoustic frequencies as a beneficial derivative output, which could facilitate achieving this standpoint. On the other hand, determining the properties of rocks plays a critical role in all downstream stages of the operation. Determining rock characteristics using direct geomechanical methods is time-consuming and expensive, and requires excessive accuracy. The dvelopment a frequency-based technique for predicting the geomechanical functions of rocks would solve these problems. Here, we discuss the logical relations between rock characterization and the first five dominant acoustic frequencies of the drilling operation, as determined by first recording and then analyzing the frequencies of the acoustic signals generated during the drilling operation, using Fast Fourier Transform. For providing a comparable condition, we developed a novel rotary drilling device. Eight carbonate rock samples were collected that covered a wide range of geomechanical features and used in the geomechanical and drilling tests. The results show there are reliable mathematical relations between various characteristics of carbonate rock samples (uniaxial compressive strength, tensile strength, S-wave and P-wave velocity, hardness) and diverse dominant frequencies of the drilling acoustic signals.
      PubDate: 2017-12-07
      DOI: 10.1007/s10064-017-1197-y
       
  • Comparative analysis of limit equilibrium and numerical methods for
           prediction of a landslide
    • Authors: Nikhil Kumar; A. K. Verma; Sahil Sardana; K. Sarkar; T. N. Singh
      Abstract: Abstract Landslides that occur due to the rapid motion of a rock-mass are a primary risk in mountainous terrains and are a danger to human life and civil infrastructure. The application of geotechnical engineering methodologies for remedial purposes is to assess unpredictable behavior and the stability of the slope, and for analysis and design. The aim of the study is to quantify the global factor of safety (FOS) and describe a correlative and comparative assessment of the conventional Limit Equilibrium Model as compared with the advanced Numerical Model for the rock slopes of Amiya, Nainital, Uttarakhand in India utilizing Mohr-Coulomb failure criterion. The rock-mass characteristics were determined as a result of an estimation of the physio-mechanical properties of rock and debris from collected field samples with the help of the joint weakening coefficient for limit equilibrium (LE) and the numerical solution. Global FOS estimated by means of stability analysis procedures, such as Swedish slip circle, Ordinary method of slices, Modified Bishop, Janbu method, Finite difference static analysis, Finite element static, and Finite difference dynamic analysis, was found to be 0.65, 1.34, 1.38, 1.29, 1.57, 1.144, and 0.84, respectively. The results helped to deduce that the slope remains substantially stable and failure may only occur in the case of a down slope movement of rock debris (clastic mass of rocks) with a small local/global tremor. Combination of the LE technique and numerical approach (hybrid approach) has been found to be a better method for critical slip surface and FOS determination.
      PubDate: 2017-12-05
      DOI: 10.1007/s10064-017-1183-4
       
 
 
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