Shear failure behaviors and degradation mechanical model of rockmass under true triaxial multi-level loading and unloading shear tests
文献类型：期刊论文
| 作者 | Zheng, Zhi1,2,3; Li, Ronghua3; Pan, Pengzhi2; Qi, Jinghua; Su, Guoshao3; Zheng, Hong2 |
| 刊名 | INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
 |
| 出版日期 | 2024-10-01 |
| 卷号 | 34期号:10页码:1385-1408 |
| 关键词 | True triaxial shear test Lateral stress effect Acoustic emission monitoring Shear parameters evolution Shear degradation mechanical model |
| ISSN号 | 2095-2686 |
| DOI | 10.1016/j.ijmst.2024.10.002 |
| 英文摘要 | The redistribution of three-dimensional (3D) geostress during underground tunnel excavation can easily induce to shear failure along rockmass structural plane, potentially resulting in engineering disasters. However, the current understanding of rockmass shear behavior is mainly based on shear tests under 2D stress without lateral stress, the shear fracture under 3D stress is unclear, and the relevant 3D shear fracture theory research is deficient. Therefore, this study conducted true triaxial cyclic loading and unloading shear tests on intact and bedded limestone under different normal stress rn and lateral stress rp to investigate the shear strength, deformation, and failure characteristics. The results indicate that under different rn and rp, the stress-strain hysteresis loop area gradually increases from nearly zero in the pre-peak stage, becomes most significant in the post-peak stage, and then becomes very small in the residual stage as the number of shear test cycles increases. The shear peak strength and failure surface roughness almost linearly increase with the increase in rn, while they first increase and then gradually decrease as rp increases, with the maximum increases of 12.9% for strength and 15.1% for roughness. The shear residual strength almost linearly increases with rn, but shows no significant change with rp. Based on the acoustic emission characteristic parameters during the test process, the shear fracture process and microscopic failure mechanism were analyzed. As the shear stress s increases, the acoustic emission activity, main frequency, and amplitude gradually increase, showing a significant rise during the cycle near the peak strength, while remaining almost unchanged in the residual stage. The true triaxial shear fracture process presents tensile-shear mixture failure characteristics dominated by microscopic tensile failure. Based on the test results, a 3D shear strength criterion considering the lateral stress effect was proposed, and the determination methods and evolution of the shear modulus G, cohesion cjp, friction angle qjp, and dilation angle i/rjp during rockmass shear fracture process were studied. Under different rn and rp, G first rapidly decreases and then tends to stabilize; cjp, qjp, and i/rjp first increase rapidly to the maximum value, then decrease slowly, and finally remain basically unchanged. A 3D shear mechanics model considering the effects of lateral stress and shear parameter degradation was further established, and a corresponding numerical calculation program was developed based on 3D discrete element software. The proposed model effectively simulates the shear failure evolution process of rockmass under true triaxial shear test, and is further applied to successfully reveal the failure characteristics of surrounding rocks with structural planes under different combinations of tunnel axis and geostress direction. (c) 2024 Published by Elsevier B.V. on behalf of China University of Mining & Technology. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| 资助项目 | National Natural Science Foundation of China[52469019] ; National Natural Science Foundation of China[52109119] ; National Natural Science Foundation of China[52274145] ; Chinese Postdoctoral Science Fund Project[2022M723408] ; Major Project of Guangxi Science and Technology[AA23023016] ; Technology Project of China Power Engineering Consulting Group Co., Ltd.[DG2-T01-2023] |
| WOS研究方向 | Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:001386581900001 |
| 出版者 | ELSEVIER |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/38058]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Zheng, Zhi |
| 作者单位 | 1.Guangxi Elect Power Design Inst Co Ltd, China Energy Engn Grp, Nanning 530007, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 3.Guangxi Univ, Coll Civil Engn & Architecture, State Key Lab Featured Met Mat & Life cycle Safety, Key Lab Disaster Prevent & Struct Safety,Minist Ed, Nanning 530004, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zheng, Zhi,Li, Ronghua,Pan, Pengzhi,et al. Shear failure behaviors and degradation mechanical model of rockmass under true triaxial multi-level loading and unloading shear tests[J]. INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY,2024,34(10):1385-1408. |
| APA | Zheng, Zhi,Li, Ronghua,Pan, Pengzhi,Qi, Jinghua,Su, Guoshao,&Zheng, Hong.(2024).Shear failure behaviors and degradation mechanical model of rockmass under true triaxial multi-level loading and unloading shear tests.INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY,34(10),1385-1408. |
| MLA | Zheng, Zhi,et al."Shear failure behaviors and degradation mechanical model of rockmass under true triaxial multi-level loading and unloading shear tests".INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY 34.10(2024):1385-1408. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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