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ENGINEERING (1201 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: 17)
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: 247)
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: 8)
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: 10)
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: 29)
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: 38)
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: 31)
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: 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: 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: 16)
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: 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)
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: 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: 5)
Batteries     Open Access   (Followers: 5)
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: 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: 10)
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: 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: 10)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 25)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 43)
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: 8)
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: 22)
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: 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: 26)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 266)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 188)
Composites Part B : Engineering     Hybrid Journal   (Followers: 279)
Composites Science and Technology     Hybrid Journal   (Followers: 182)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 14)
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: 7)
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: 30)
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: 42)
Control Theory and Informatics     Open Access   (Followers: 8)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access   (Followers: 1)
CTheory     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]   [10 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  [2352 journals]
  • Rock slope stability analysis according to Eurocode 7, discussion of some
           dilemmas with particular focus on limit equilibrium analysis
    • Authors: Bjørn Nilsen
      Pages: 1229 - 1236
      Abstract: In Europe, rock slope stability analysis and slope design have to be based on Eurocode 7, which is today the basic standard for geotechnical, including rock engineering, design. According to Eurocode 7, several principles for stability analysis may be applied, including empirical, limit equilibrium, numerical, and probabilistic. Very often, particularly for excavated slopes, the limit equilibrium method is used for stability analysis and design. One particularly significant consequence of the introduction of Eurocode 7 is that for limit equilibrium analysis according to the Eurocode, the traditional principle of calculating a factor of safety cannot be used. Instead, the so-called partial factor principle is to be used. The intention of the Eurocodes seems to be that Reliability Based Design should be applied also in rock engineering. This is, however, not reflected by the guidelines and descriptions of the present (2004)-edition of Eurocode 7, and for this and several other reasons there is considerable confusion and uncertainty related to the use of Eurocode 7 for rock engineering analysis and design. This paper discusses this issue with particular focus on limit equilibrium analysis of rock slope stability. It is concluded that due to the uncertain and variable character of input parameters, the limit equilibrium approach has evident shortcomings for stability analysis of rock slopes, particularly when the partial factor principle is applied.
      PubDate: 2017-11-01
      DOI: 10.1007/s10064-016-0928-9
      Issue No: Vol. 76, No. 4 (2017)
  • A stability assessment of the rockfall problem around the Gökgöl Tunnel
           (Zonguldak, Turkey)
    • Authors: Melih Geniş; Utku Sakız; Berdan Çolak Aydıner
      Pages: 1237 - 1248
      Abstract: The stability of rock slopes is an important area of interest in civil and mining engineering. This study investigated rockfall occurring around the Gökgöl tunnel along the Zonguldak-Ankara roadway. Extensive field studies, including determination of geological description of the rock mass, scan-line surveys on discontinuities, identification of slope profiles, measurement of actual fallen block dimensions, and sampling procedures, were carried out. The study area and its surroundings are part of a Lower Carboniferous limestone formation. The assessments based on field studies indicated that two joint sets and a bedding plane were the main types of discontinuity. Two slope profiles were then created by considering the most frequently encountered rock fall events. The present study aimed to investigate the rockfall potential in this area by means of numerical analyses. For this purpose, RocFall software based on the lumped-mass method was utilized. Based on these analyses, traffic safety is threatened by potential rockfall. In Case I, a 30 % portion of the falling blocks reached the side of the main road, while about 70 % of them remained on the slope. However, falling blocks reached the end of the road in Case II. The study area requires some protection measures, such as the construction of retaining barriers and steel mesh to hold small size rock blocks. As a result, barrier heights to hold falling blocks were calculated as 0.5 m and 4 m for Case I and Case II, respectively. Barrier heights sufficient to hold falling rocks were determined using numerical analysis. In Case II, from such analyses, the energy required for a protection barrier for 1000 kg was found to be 200 kJ.
      PubDate: 2017-11-01
      DOI: 10.1007/s10064-016-0907-1
      Issue No: Vol. 76, No. 4 (2017)
  • Earthquake-triggered landslides by the 1718 Tongwei earthquake in Gansu
           Province, northwest China
    • Authors: Ping Sun; Rongjian Li; Hao Jiang; Ogbonnaya Igwe; Jusong Shi
      Pages: 1281 - 1295
      Abstract: The 1718 great Tongwei earthquake in northwest China caused more than 300 large-scale landslides near the epicenter resulting in more than 70,000 deaths. Although previous studies agree that the earthquake-induced landslides in the area are loess-landslides, which slid along ancient terrain surfaces, there is a dearth of evidence to unravel the actual failure mechanisms of these widely-documented events. To clarify their characteristics and mechanisms, the landslides in Pan’an Town, located in Gansu Province, China were rigorously investigated. The field surveys revealed that the landslides occurred in an area comprising loess deposits of several tens of meters underlain by a basal mudstone layer. It was also revealed that instability in the area is strongly influenced by a river valley with large erosion bank slopes, as well as steep mudstone slopes, which are well developed. The majority of the landslides triggered by the Tongwei earthquake were loess-mudstone composite landslides, with the sliding surface in the deep mudstone. Three huge landslides on the northern mountain located at the river bend of Pan’an Town with a total volume of about 6.06 × 108 m3 are the main mass movements during the 1718 catastrophe. In addition, by taking the typical landslide named the Weijiawan landslide as a case study, the internal structure of the earthquake-triggered landslides and their stability were studied. The new findings not only aided the unraveling of the failure mechanisms but also provided insights and knowledge on early recognition of earthquake-triggered landslides in northwest China towns, especially in the surrounding valley, which shares similar geological conditions with landslides studied in this paper.
      PubDate: 2017-11-01
      DOI: 10.1007/s10064-016-0949-4
      Issue No: Vol. 76, No. 4 (2017)
  • A study on landslides and subsurface piping, facilitated by dykes, using
           vertical electrical sounding and δO 18 and δH 2 stable isotopes
    • Authors: K. S. Sajinkumar; C. Unnikrishnan Warrier; C. Muraleedharan; A. Shahul Hameed; V. R. Rani; A. P. Pradeepkumar; P. Sundarajan
      Pages: 1297 - 1306
      Abstract: A combination of vertical electrical sounding (VES) and δO18 and δH2 stable isotope geochemistry is used in this study to trace out the extension of a dyke and for deciphering the subsurface piping phenomena in a landslide-affected hamlet, Pasukadavu, in the Western Ghats of Kerala, India. VES was successful in extracting three to four different subsurface layers characterized by differing resistivity. Two VES sections were prepared from 24 different VES locations, each one for understanding the dyke extension and for delineating subsurface conduits. The dyke was characterized by high resistivity of 800–5000 Ω.m and shows varying thickness. In the second profile, the void zone, which is characteristic of piping, is delineated through a low resistivity zone (75 to 350 Ω.m). δO18 and δH2 stable isotopes collected along the second VES profile show the same chemistry, indicating that it is the same water which flows all along the VES profile 2. A four-stage conceptual model was developed to illustrate and narrate the sequence of development of the piping phenomena and landslide activity.
      PubDate: 2017-11-01
      DOI: 10.1007/s10064-017-1056-x
      Issue No: Vol. 76, No. 4 (2017)
  • Étude Rétro-analytique du glissement du bord Nord de la mine à ciel
           ouvert de Kef Essenoun (Djebel Onk), Algérie
    • Authors: Mohammed Cherif Mezam; Mohamed Aguid Bachar Assed
      Pages: 1307 - 1320
      Abstract: Résumé Le 08 septembre 2007, quelques minutes avant le levé de soleil, un évènement spectaculaire s’est produit dans la mine à ciel ouvert de phosphate de Kef Essenoun (Djebel Onk) en Algérie orientale. Il s’agit d’un glissement de terrain de très grande ampleur par son volume de 7 à 8 millions de m3 qui a comblé entièrement la fosse d’exploitation au niveau de la mine et entraîné l’arrêt temporaire des travaux d’extraction sur une période prolongée. Cet article présente une rétro-analyse de ce phénomène pour laquelle, on tire toutes les caractéristiques morphologiques, géologiques, hydrogéologiques et géotechniques du gisement ainsi que les principaux facteurs susceptibles d’être le moteur de ce glissement.
      PubDate: 2017-11-01
      DOI: 10.1007/s10064-016-0988-x
      Issue No: Vol. 76, No. 4 (2017)
  • An analytical method for quantifying the correlation among slope failure
           modes in spatially variable soils
    • Authors: Dong Zheng; Dian-Qing Li; Zi-Jun Cao; Xiao-Song Tang; Kok-Kwang Phoon
      Pages: 1343 - 1352
      Abstract: An efficient analytical method for quantifying the correlation between performance functions of different slope failure modes in spatially variable soils is proposed, and its performance in slope system reliability analysis is investigated. First, a new correlation coefficient (NCC) is proposed to evaluate the correlation among slope failure modes considering spatial variability. For comparison and verification, the simulation-based correlation coefficient (SCC) is also presented. Second, appying these two types of correlation coefficients, the effects of soil spatial variability on the representative slip surfaces (RSSs) and the system probability of slope failure are investigated using different system reliability methods, including a probabilistic network evaluation technique, a risk aggregation approach, and a bimodal bounds method. A single-layered cohesive slope is investigated to illustrate the validity of the proposed NCC. The results indicate that the proposed NCC can efficiently and accurately quantify the correlation among slope failure modes considering soil spatial variability. The number of RSSs indicated by the NCC is in good agreement with the number obtained using the SCC. The system failure probabilities of slope stability obtained with the SCC and the NCC using a risk aggregation approach are generally comparable. Also, the system reliability bounds of slope stability obtained using the NCC are relatively close together and comparable to those obtained using the SCC. Thus, the NCC shows good performance when evaluating the correlation among slope failure modes, and was effectively applied to analyze a single-layered cohesive slope considering soil spatial variability.
      PubDate: 2017-11-01
      DOI: 10.1007/s10064-016-0923-1
      Issue No: Vol. 76, No. 4 (2017)
  • 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
      Pages: 1449 - 1459
      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: 2017-11-01
      DOI: 10.1007/s10064-017-1049-9
      Issue No: Vol. 76, No. 4 (2017)
  • Modification of rock mass strength assessment methods and their
           application in geotechnical engineering
    • Authors: Daming Lin; Kaiyang Wang; Kun Li; Wantong He; Weixing Bao; Renmao Yuan; Yanjun Shang
      Pages: 1471 - 1480
      Abstract: Due to complicated structures and discontinuities in surrounding rock mass, existing empirical failure criteria cannot meet the requirements of engineering practice such as tunnels. To improve estimation accuracy on the strength of rock mass with joints, a modified chart of the Geological Strength Index using Hoek–Brown criteria was further tested to estimate rock mass strength [Lin et al. (2014) Bull Eng Geol Environ 4(73):1245–1258], and, in this paper, new strength estimation equations for jointed rock mass were then modified based on a large dataset obtained from Chinese projects. Here, standard drilling time is first introduced and described in this study, and then used as a parameter to estimate rock strength. Different empirical formulas based on joint density, rock mass classification, Hoek–Brown criteria, and elastic wave velocity are thus used to estimate rock mass strength by using data from the Jiubao tunnel. The results estimated based on different empirical formulas were similar, indicating that the modified assessment method presented in this paper can be used to estimate rock mass strength under certain circumstances. Cross-correlation of different empirical methods provides significant confidence in predicted rock mass strength calculations.
      PubDate: 2017-11-01
      DOI: 10.1007/s10064-016-0952-9
      Issue No: Vol. 76, No. 4 (2017)
  • Models for estimation of TBM performance in granitic and mica gneiss hard
           rocks in a hydropower tunnel
    • Authors: Masoud Zare Naghadehi; Ahmad Ramezanzadeh
      Pages: 1627 - 1641
      Abstract: The risk of excavation operations due to high capital costs can be reduced by correct estimation of machine performance. Many models have been proposed to study this issue, but considering the nature of the problem, it is rather difficult to estimate tunnel boring machine performance by simple linear prediction models. The purpose of the present study is to construct linear and non-linear multivariate prediction models to estimate TBM performance as a function of rock mass properties in granitic and mica-gniess rocks. For this purpose, rock properties and machine data were obtained from a historical TBM tunneling project in Norway and then the database was established to develop performance prediction models utilizing the linear and the non-linear multiple regression methods. This study proposes more accurate and practical statistical models compared to the previous ones based on multivariate regression analyses to estimate the performance of hard rock TBMs.
      PubDate: 2017-11-01
      DOI: 10.1007/s10064-016-0950-y
      Issue No: Vol. 76, No. 4 (2017)
  • Assessment of seismically-induced landslide susceptibility after the 2015
           Gorkha earthquake, Nepal
    • Authors: Suchita Shrestha; Tae-Seob Kang
      Abstract: The Gorkha earthquake (MW 7.8) occurred on 25 April 2015 with its epicenter in the central part of the Gorkha District, Nepal. The earthquake triggered thousands of landslides in the central region of the Nepal Himalaya. Landslide-prone areas were identified by preparing earthquake-induced landslide susceptibility maps using a maximum entropy model. Thematic maps required for the model were prepared using geographical information system software. Of a total of 690 landslide locations, 50% were used for map generation and the remaining 50% for validation purposes. The final map was validated using the receiver operator curve method. The overall accuracy was 86.1% and using the validation data, the area under the curve was calculated as 91.1%. Jackknife analysis revealed that the terrain close to the rupture surface and around high shaking ground were the most important intrinsic and extrinsic parameters, respectively.
      PubDate: 2017-11-11
      DOI: 10.1007/s10064-017-1191-4
  • Influences of internal erosion on infiltration and slope stability
    • Authors: Lulu Zhang; Fang Wu; Hua Zhang; Lei Zhang; Jie Zhang
      Abstract: Rainfall-induced slope failures in natural terrains are destructive natural disasters. Transport of fine particles may be induced by the rainwater seepage in a natural terrain slope comprising mixed coarse and fine particles. In this study, the interaction of internal erosion and infiltration in a soil slope is investigated. A coupled model of unsaturated flow and internal erosion is established. The effects of internal erosion on pore water pressure profiles and slope stability are studied. Parametric studies on erosion parameters and hydraulic parameters are conducted. The results of the numerical example show that internal erosion occurs mainly in the zone within the wetting front, which accelerates the advance of the wetting front and decreases the slope stability. The coefficient of erosion flux rate, β er of the erosion law, is the main factor that affects the internal erosion. The effect of erosion on the wetting front movement is more significant with large values of β er . The effects of parameters i * and α er are less significant when compared with β er . When the rainfall flux is equal or greater than the saturated coefficient of permeability, the influence of internal erosion on water infiltration and slope stability is significant. The effect of internal erosion can be neglected as long as the rainfall flux is less than the saturated coefficient of permeability. When the air-entry value of the soil is greater, the influence of internal erosion on infiltration and slope stability becomes less significant.
      PubDate: 2017-11-11
      DOI: 10.1007/s10064-017-1185-2
  • Weakening effects of the presence of water on the brittleness of hard
    • Authors: Guoqing Chen; Tianbin Li; Wei Wang; Zhenfei Zhu; Ziquan Chen; Ouling Tang
      Abstract: The weakening effects of increasing the water content in rocks have been studied extensively in a wide variety of rock types over the past few decades. High energy release is typically characteristic of rock burst hazards. However, few studies have investigated the mechanism of water involved in rock bursts from the perspective of energy distribution based on the water content. Therefore, in this study we investigated the evolution of microcracks in hard sandstone determined from triaxial tests combined with an acoustic emission analysis for different water contents and confining pressures. Then, the weakening effects of water on the brittleness of the rock were studied from an energy viewpoint. The study shows that the capacity of the storage energy of hard rock decreases due to the dissipation of internal elastic energy in the compression stage in the presence of water. These results revealed the mechanical and energetic mechanisms that caused the weakening effects induced by water on rock burst and can contribute to design and construction improvements in tunnel engineering.
      PubDate: 2017-11-09
      DOI: 10.1007/s10064-017-1184-3
  • Estimating compressive and flexural strength of travertines with respect
           to laminae-orientation by geomechanical properties
    • Authors: G. R. Khanlari; F. Naseri; D. M. Freire-Lista
      Abstract: Travertine is an anisotropic rock considered as one of the most popular stone materials in the building industry. Due to its bedding and lamination planes, the determination of rock strength properties regarding anisotropic orientation is a critical issue. In this research, different techniques were applied to estimate the compressive and flexural strengths of four types of travertines, selected from Hamedan and Markazi Provinces located in the west and central parts of Iran. For this purpose, after sample preparation and assessment of mineral composition, fabric (texture and structure) and pore characteristics (pore shape and pore sizes), the selected samples were characterized using physical and mechanical tests. These properties were evaluated with respect to two major anisotropic orientations (perpendicular and parallel to the bedding/lamination axis). Statistical analyses, including simple and multiple linear regressions, were utilized to correlate physical and mechanical parameters with compressive and flexural strength, and to establish some new equations. Based on the test results, it can be concluded that the percentage/type of matrix and porosity have a more important effect on the physical and mechanical properties than the rock structure. Data analysis in simple regression shows that bulk specific gravity (saturated surface dry) and Brazilian tensile strength are the most and least influential factors on compressive strength at perpendicular and parallel directions, respectively. In addition, effective porosity and Brazilian tensile strength are the most and least influential factors on flexural strength at both directions, respectively. Based on best subset multiple regression method, one or two equations were extracted for calculating compressive and flexural strength in the perpendicular and parallel directions. Also, pore shape factor and pore radius were used as independent parameters in multiple regression to establish some new equations for predicting compressive and flexural strength considering cutting directions. These parameters have more influence on flexural strength than compressive strength, because the parameters show significant correlation with flexural strength. Consequently, the results of statistical analyses show that the proposed equations are not necessarily composed of parameters with the higher/stronger determination coefficient in simple regression. Therefore, prediction studies not only offer some rational approaches, they also give a better insight into the main factors determining rock strength.
      PubDate: 2017-11-07
      DOI: 10.1007/s10064-017-1139-8
  • Effects of microfabric on drillability of rocks
    • Authors: S. H. Hoseinie; M. Ataei; R. Mikaeil
      Abstract: Quantifying the rock microfabric is one of the most important research interests and challenges in the field of rock drilling and excavation. In this study, the relationship between quantitative parameters of the rock microfabric and the rate of top-hammer drilling was studied. For this purpose, a drilling operation was performed on five soft rock samples and three hard rock samples and drilling rates were recorded. Thin sections from the rock samples were prepared and micrographs of the sections were reviewed using AutoCAD software and digital boundaries of the grains were clarified and drawn. After preparation and filtering of the digitized thin sections, four basic properties of each grain, including maximum diameter, minimum diameter, area and perimeter, were calculated with the help of the software. These parameters were then analyzed statistically and used to obtain six indexes including equivalent diameter, grain compactness, shape factor, aspect ratio, interlocking index and grain size homogeneity index. Finally, the microfabric and drilling rate data were subjected to regression analysis and the significance of the relationships between the grain parameter values and drilling rate were explored. Drilling rate was found to increase with increasing equivalent diameter and shape factor. In contrast, drilling rate decreased with increasing grain compactness, aspect ratio, grain size homogeneity and grain interlocking index. Grain compactness showed the most significant relationship (R 2 = 0.8) with drilling rate among the studied parameters.
      PubDate: 2017-11-06
      DOI: 10.1007/s10064-017-1188-z
  • Acoustic emission characteristics and energy mechanism in karst limestone
           failure under uniaxial and triaxial compression
    • Authors: Qingsong Wang; Jianxun Chen; Jiaqi Guo; Yanbin Luo; Hongyu Wang; Qin Liu
      Abstract: Acoustic emission (AE) tests were performed on saturated karst limestone under uniaxial and triaxial compression. Mechanical properties, AE characteristics, and the energy mechanism of rock failure were analyzed. The peak AE activity under uniaxial compression occurred near the peak stress of the rock. Under triaxial compression, the AE activities of the rock samples first decreased then increased with increases in confining pressure. AE activity exhibited a certain lag, and the peak AE appeared when the stress had decreased significantly. Stratification of the average signal level occurred at low confining pressures. The critical confining pressure was between 15 and 20 MPa, and at this pressure a dramatic change occurred in the AE characteristics of the limestone. Total strain energy, dissipated energy, and elastic strain energy at peak stress showed good exponential relationships with confining pressure and peak rock strength.
      PubDate: 2017-11-06
      DOI: 10.1007/s10064-017-1189-y
  • Subsurface elements prediction for the design of forest road using ground
           penetrating radar technique
    • Authors: Iman Pazhouhan; Akbar Najafi; Abolghasem KamkarRouhani; Javad Vahidi
      Abstract: Reliable and accurate earthwork calculation is one of the most important components in road engineering that can influence the construction cost and road alignment choice. In this research, the method of ground penetrating radar (GPR) was applied to detect the subsoil rock share in forest road construction. The GPR data acquisition was carried out using a 250 MHz GPR antenna along 22 segments on the centerline and 12 meters across to the road project. The GPR data processing was done by performing different filters, such as background removal, migration, band pass filter, and horizontal and vertical smoothing on the GPR data. To investigate the capability of the GPR method used in this road construction project, we compared the GPR radargram and road profile after construction. The results indicated that the maximum penetration depth of the GPR waves produced by a 250 MHz GPR transmitter antenna, which were between 2 and 5 meters in fine area (clayey soil with high moisture content) and rocky grounds, respectively. Moreover, the capability of GPR to map large dimension roots and water content is presented in this work. Comparison of the GPR records with direct observations of road profiles revealed that the GPR technique can yield a wide range of information that leads to a more efficient and effective earthwork operation of forest roads, although in some parts of the road profile the expected results from the target depth of rock share were not achieved.
      PubDate: 2017-11-04
      DOI: 10.1007/s10064-017-1180-7
  • Relating rock mass properties with Lugeon value using multiple regression
           and nonlinear tools in an underground mine site
    • Authors: İbrahim Ferid Öge; Mustafa Çırak
      Abstract: The Lugeon test is one of the commonly applied field methods for measuring hydraulic conductivity of a rock mass. Understanding hydraulic conductivity is especially necessary when groundwater is present, as it has a direct effect on the construction operations and stability of a structure. Discontinuity orientation, spacing and discontinuous surface quality, and the presence and type of infill play essential roles in permeability of a rock mass. Commonly used rock quality designation (RQD) and discontinuity surface condition rating of the rock mass rating system (Dc) were chosen as predictive parameters. Additionally, depth is involved as a critical predictor and it is observed so. Three variables impacting the Lugeon value are not present in the literature. The importance of each predictor variable was found to be significant while depth contributed more. Simple regression work resulted in insufficient correlation for each single parameter, but indicated they have relevance to the Lugeon value. In addition to linear and nonlinear multiple regression studies, Box-Cox transformation multiple regression was employed and predictions were found to be statistically significant. Among the multiple regression models, a nonlinear model provided the highest prediction performance. Utilization of the adaptive neuro-fuzzy inference system (ANFIS) enabled researchers to predict the Lugeon value precisely, compared to the multiple regression works. Subtractive clustering was employed in order to successfully model the parameters by using ANFIS. The clustering task resulted in a fuzzy inference system structure with three rules. A manually introduced fuzzy inference system (FIS) structure with 27 rules exhibited low performance when it was compared to the structure generated by subtractive clustering. The findings can be used in the study area since a wide range of rock types, properties and depth were taken into account in the models. Groundwater flow and permeability in jointed rock mass have a complex mechanism with variable fracturing and discontinuity properties within a small area. For prediction work, it is concluded to be beneficial to add the depth parameter to the models for further studies.
      PubDate: 2017-11-04
      DOI: 10.1007/s10064-017-1179-0
  • Landslides and debris flows caused by an extreme rainstorm on 21 July 2012
           in mountains near Beijing, China
    • Authors: Yaoming Li; Chao Ma; Yujie Wang
      Abstract: An increasing number of debris flows in mountainous regions near Beijing have been documented in the last few decades, some of which were triggered by extreme rainstorms. In this paper, we examine a total of 40 landslides and 16 debris flows triggered by an extreme rainstorm on 12 July 2012. Rainfall records were used to check the triggering conditions. Field reconnaissance and measurements, supported by aerial photo interpretation, were conducted to identify the distribution, mobility, and volume change of landslides. This extreme rainstorm provided a higher triggering condition than the required rainfall threshold in the study area. The rainfall intensity during periods of intense rainfall was comparable to some typhoon events and other extreme rainstorms. Records from seven rainfall stations reveal that the rainfall in valley floor areas was higher than that in mountainous and plain areas. The rainfall-induced landslides were small, and most of them were located in terrain with a slope gradient >25° and pelitic dolostone strata underneath. The watersheds have a small area, short stream length, and the debris flow volume is low because of the limited material resources. The landslide-type debris flows exhibit weak mobility as the debris flow deposits mainly consist of gravels. Although the material resources from shallow landslides are small, the debris flow volume is 1.03–4.05 times the initial landslide volume, indicating that the debris flow entrains sediments. Finally, the entrained sediments per channel length and debris flow volume magnification were positively related to the watershed area and channel length, respectively. Our findings proved that an extreme rainstorm can trigger landslides and debris flows in an area where no such hazards were documented before. It is necessary to identify the site prone to landslides and debris flows, which may pose a hidden threaten for local inhabitants.
      PubDate: 2017-11-04
      DOI: 10.1007/s10064-017-1187-0
  • Comparison of data-driven models of loess landslide runout distance
    • Authors: Qiang Xu; Huajin Li; Yusen He; Fangzhou Liu; Dalei Peng
      Abstract: Irrigation-induced landslides with long runout distances endanger local communities. Estimating runout distance of landslides may contribute to the mitigation of potential hazards. Conventional mechanism-related methods require a series of experiments and/or numerical simulations that are commonly time-consuming and expensive, yet data-driven models reduce the experimental workload and require less prior knowledge in the geological history as well as mechanical behavior of the material. A data-driven model is proposed to forecast landslide runout distance using geometrical characteristics of the landslide. The geometrical dataset of the shallow loess landslides and loess-bedrock landslides occurred in Heifangtai terrace, China, was employed to develop the model. All geometrical datasets were obtained from field investigation and monitoring. Seven data-mining techniques were used and compared for runout estimation, among which the most optimal technique was integrated in the estimation model for loess slope failures. The multi-layer perceptron method outperforms other algorithms, and thus it was selected for the runout distance estimation model. Parametric models are constructed to fit runout distance based on the estimation. Hazard analysis measurements, including value-at-risk (VaR) and tail-value-at-risk (TVaR), are computed for the parametric distributions, which shows the potential area of impact and number of residential clusters at risk.
      PubDate: 2017-11-04
      DOI: 10.1007/s10064-017-1176-3
  • Hazard zoning of trunk highway slope disasters: a case study in northern
           Shaanxi, China
    • Authors: Huan Zhao; Wei-Ping Tian; Jia-chun Li; Bao-Cheng Ma
      Abstract: The fragile natural environment of the northern Shaanxi Province in China is susceptible to ambient conditions. Highway slope disasters and the frequent occurrence of highway hazards that different in type, possible outcomes, and scale by region cause severe adverse effects on the construction and operation of trunk highways in the province. Therefore, conducting hazard zoning of highway slope disasters is essential in order to mitigate and manage highway slope disasters and to analyze the distribution regularities of hazards in northern Shaanxi. In this study, a hazard assessment model based on the principle of disaster-causing factor superposition was established. Five hazard assessment indexes, namely terrain gradient, ravine density, annual average days with precipitation more than 25 mm, geotechnical types, and vegetation coverage, were selected to analyze the types of highway slope disasters and disaster-causing factors. The distribution of assessment indexes and the degree of the highway slope disaster hazard were presented using an assessment model and geographic information system (GIS). The hazard zoning of highway slope disasters in northern Shaanxi is classified into slight, moderate, and severe according to hazard characteristics and trunk highway network distribution. Results show that the hazard zoning of highway slope disasters in northern Shaanxi is consistent with the actual distribution.
      PubDate: 2017-11-02
      DOI: 10.1007/s10064-017-1178-1
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