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Fracturing process and effect of fracturing degree onwave velocity of a crystalline rock

Journal of Rock Mechanics and Geotechnical Engineering 2017年第5期9卷 797-806页

作者： charalampos saroglou Vasileios Kallimogiannis Department of Geotechnical Engineering School of Civil Engineering National Technical University of Athens Athens Greece

The present paper investigates the effect of fracturing degree on P-and S-wave velocities in *** deformation of intact brittle rocks under loading conditions is characterized by a microcracking procedure,which occurs due to flaws in their microscopic structure and propagates through the intact rock,leading to shear *** fracturing process is of fundamental significance as it affects the mechanical properties of the rock and hence the wave *** order to determine the fracture mechanism and the effect of fracturing degree,samples were loaded at certain percentages of peak strength and ultrasonic wave velocity was recorded after every *** fracturing degree was recorded on the outer surface of the sample and quantified by the use of the indices P;（traces of joints/m）,P;（traces of joints/m;） and P;（length of fractures/m;）.It was concluded that the wave velocity decreases exponentially with increasing fracturing ***,the fracturing degree is described adequately with the proposed ***,other parameters concerning the fracture characteristics,rock type and scale influence were found to contribute to the velocity decay and need to be investigated further.

关键词： Wave velocity Fracturing Crack initiation Damage Granite

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Influence of heterogeneity on rock strength and stiffness using discrete element method and parallel bond model

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第4期9卷 575-584页

作者： Spyridon Liakas Catherine O’Sullivan charalampos saroglou Arup Geotechnics Solihull UK Department of Civil & Environmental Engineering Imperial College London London UK Department of Geotechnical Engineering School of Civil Engineering National Technical University Athens Athens Greece

The particulate discrete element method(DEM) can be employed to capture the response of rock,provided that appropriate bonding models are used to cement the particles to each *** of laboratory tests are important to establish the extent to which those models can capture realistic rock *** the focus in such comparison studies has either been on homogeneous specimens or use of two-dimensional(2D) *** situ rock formations are often heterogeneous,thus exploring the ability of this type of models to capture heterogeneous material behavior is important to facilitate their use in design *** situ stress states are basically three-dimensional(3D),and therefore it is important to develop 3D models for this *** paper revisits an earlier experimental study on heterogeneous specimens,of which the relative proportions of weaker material(siltstone) and stronger,harder material(sandstone) were varied in a controlled *** a 3D DEM model with the parallel bond model,virtual heterogeneous specimens were *** overall responses in terms of variations in strength and stiffness with different percentages of weaker material(siltstone) were shown to agree with the experimental *** was also a good qualitative agreement in the failure patterns observed in the experiments and the simulations,suggesting that the DEM data enabled analysis of the initiation of localizations and micro fractures in the specimens.

关键词： Discrete element method(DEM) Heterogeneous rocks Strength and stiffness Parallel bond model

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A-BQ,a classification system for anisotropic rock mass based on China National Standard

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Journal of Central South University 2020年第10期27卷 3090-3102页

作者： GUO Song-feng QI Sheng-wen saroglou charalampos Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy of Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China School of Civil Engineering National Technical University of AthensAthensGreece

The rock mass in nature is in most cases anisotropic,while the existing classifications are mostly developed with the assumption of isotropic conditions that not always meet the engineering *** this study,an anisotropic system based on China National Standard of BQ,named as A-BQ,is developed to address the classification of anisotropic rock mass incorporating the anisotropy degree as well as the quality of rock *** series of basic rating factors are incorporated including inherent anisotropy and structure *** anisotropy degree of rock mass is characterized by the ratio of maximum to minimum quality score and adjusted by the confining *** quality score of rock mass is determined by the key factors of anisotropic structure occurrence and the correction factors of stress state and groundwater *** quality of rock mass is characterized by a quality score and classified in five *** assessment of stability status and probable failure modes are also suggested for tunnel and slope engineering for different quality ***,two cases of tunnel and slope are presented to illustrate the application of the developed classification system into the rock masses under varied stress state.

关键词： anisotropy rock mass basic quality classification tunnel slope

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