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Numerical study on the progressive failure of heterogeneous geomaterials under varied confining stresses
Guo, Songfeng1,2,3; Qi, Shengwen1,2,3; Zhan, Zhifa4; Ma, Lina1,2,3; Gure, Ephrem Getahun1,2,3; Zhang, Shishu5
2020-05-01
Source PublicationENGINEERING GEOLOGY
ISSN0013-7952
Volume269Pages:15
AbstractThe failure of geomaterials has been well recognized as a process of crack evolution due to heterogeneity. However, the influence of confining stresses on the progressive failure process has still not been fully understood. In this study, a series of numerical simulations were conducted to study the confinement effects after being calibrated by the existing experimental observations. A Gaussian distribution function and a plastic strain-dependent strength model were adopted to depict the heterogeneity and the variable mechanical parameters of the materials, respectively. The results reveal that the tensile cracks are dominant for experiments under low confining stresses, while shear cracks become more dominant as the confinement increases. The total acoustic emission (AE) events demonstrates a "Un shape, i.e. decrease firstly, and then keep nearly invariant, subquentently increase as confining stress increases. These investigations indicate that the dominant effects of confining stress on cracking mechanisms are constraint on tensile cracks under low confining stresses and promotion for shear damages under high confining stresses. The results of AE events intensity disclose that macro failure always occurs in the post-peak domain. The confining stress can advance the macro failure occurrence from the post-failure domain towards the pre-peak stress domain, and increase the uniformity of damages occurred in materials. The fitting analysis shows that the relation of crack initiation stresses to confining stresses can be well represented by a nonlinear equation. This study can improve our understanding of the failure features of geomaterials resulting from stress state changes in engineering.
KeywordHeterogeneity Progressive failure Crack initiation Rock strength Confined compression
DOI10.1016/j.enggeo.2020.105556
Funding OrganizationSecond Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China
WOS KeywordBRITTLE-DUCTILE TRANSITION ; PLASTIC TRANSITION ; DAMAGE MECHANISMS ; CRACK INITIATION ; ROCK ; FRACTURE ; MODEL ; COMPRESSION ; TUNNEL ; DEFORMATION
Language英语
Funding ProjectSecond Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0904] ; National Key Research and Development Program of China[2017YFD0800501] ; National Science Foundation of China[41702345] ; National Science Foundation of China[41825018] ; National Science Foundation of China[41672307]
Funding OrganizationSecond Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China
WOS Research AreaEngineering ; Geology
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000525399100008
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95572
Collection页岩气与地质工程院重点实验室
Corresponding AuthorQi, Shengwen
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.China Highway Engn Consulting Corp, Beijing 100089, Peoples R China
5.Chengdu Engn Corp Ltd, Power China, Chengdu 610072, Peoples R China
First Author AffilicationKey Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Guo, Songfeng,Qi, Shengwen,Zhan, Zhifa,et al. Numerical study on the progressive failure of heterogeneous geomaterials under varied confining stresses[J]. ENGINEERING GEOLOGY,2020,269:15.
APA Guo, Songfeng,Qi, Shengwen,Zhan, Zhifa,Ma, Lina,Gure, Ephrem Getahun,&Zhang, Shishu.(2020).Numerical study on the progressive failure of heterogeneous geomaterials under varied confining stresses.ENGINEERING GEOLOGY,269,15.
MLA Guo, Songfeng,et al."Numerical study on the progressive failure of heterogeneous geomaterials under varied confining stresses".ENGINEERING GEOLOGY 269(2020):15.
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