Numerical study on the progressive failure of heterogeneous geomaterials under varied confining stresses
文献类型：期刊论文
| 作者 | Guo, Songfeng1,2,3; Qi, Shengwen1,2,3; Zhan, Zhifa4; Ma, Lina1,2,3; Gure, Ephrem Getahun1,2,3; Zhang, Shishu5 |
| 刊名 | ENGINEERING GEOLOGY
 |
| 出版日期 | 2020-05-01 |
| 卷号 | 269页码:15 |
| ISSN号 | 0013-7952 |
| 关键词 | Heterogeneity Progressive failure Crack initiation Rock strength Confined compression |
| DOI | 10.1016/j.enggeo.2020.105556 |
| 英文摘要 | The 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. |
| WOS关键词 | BRITTLE-DUCTILE TRANSITION ; PLASTIC TRANSITION ; DAMAGE MECHANISMS ; CRACK INITIATION ; ROCK ; FRACTURE ; MODEL ; COMPRESSION ; TUNNEL ; DEFORMATION |
| 资助项目 | Second 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] |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000525399100008 |
| 资助机构 | 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 ; 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 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/95572]  |
| 专题 | 地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室 |
| 通讯作者 | Qi, Shengwen |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, 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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。