Fracture Evolution Analysis of Rock Bridges in Hard Rock with Nonparallel Joints in True Triaxial Stress States
文献类型：期刊论文
| 作者 | Zhang, Yan3; Chen, Guoqing3; Wang, Zhaofeng2; Liu, Ding1 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2023-02-01 |
| 卷号 | 56期号:2页码:997 |
| 关键词 | Fracture evolution Nonparallel joints Rock bridge True triaxial stress Acoustic emission Amplitude-frequency |
| ISSN号 | 0723-2632 |
| 英文摘要 | The excavation of a deep jointed rock mass in a true triaxial stress environment can easily lead to catastrophic consequences, and the failure of a rock bridge is directly related to the stability of the jointed rock mass. Most previous studies have focused on experimental and simulation studies related to parallel joints, while few studies have considered nonparallel joints due to their complexity. In this paper, the mechanical behaviors and acoustic emission (AE) characteristics of nonparallel joints with different rock bridge lengths (RBLs) at different intermediate principal stresses (sigma(2)) are studied. The results show that the peak strength increased with the increasing sigma(2) and RBL, while the peak strain decreased with increasing sigma(2) and increased with the increasing RBL. The longer the RBL was, the greater the influence of sigma(2) on rock failure, and the smaller sigma(2) was, the more significant the influence of the RBL on rock failure. The increase in the AE energy lagged behind the ringing count, and the cumulative AE counts of the specimens all showed a good pattern of decreasing with the increasing sigma(2). The longer the RBL was, the more sensitive the AE frequency was to the change in sigma(2). With the same RBL, the high-amplitude signals in the low-frequency range gradually attenuated as sigma(2) increased. The quiet period in the AE signals during rock failure could be specifically characterized by a comprehensive AE analysis, including AE time-frequency signals, AE ringing counts, AE event numbers, and AE b values. Finally, a modified Mogi-Coulomb-type criterion considering the effects of the true triaxial stress and RBL is proposed. The research results can provide a useful reference and help in the identification of precursory information of joint rock mass failure and early warning of sudden instability failure. |
| 学科主题 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000871289400001 |
| 出版者 | SPRINGER WIEN |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35000]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Sichuan Institute of Geological Engineering Investigation Group Co.LTD, Chengdu 610059, China 2.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China 3.State Key Laboratory of Geohazard Prevention and Environment Protection, Chengdu University of Technology, Chengdu 610059, China |
| 推荐引用方式 GB/T 7714 | Zhang, Yan,Chen, Guoqing,Wang, Zhaofeng,et al. Fracture Evolution Analysis of Rock Bridges in Hard Rock with Nonparallel Joints in True Triaxial Stress States[J]. ROCK MECHANICS AND ROCK ENGINEERING,2023,56(2):997. |
| APA | Zhang, Yan,Chen, Guoqing,Wang, Zhaofeng,&Liu, Ding.(2023).Fracture Evolution Analysis of Rock Bridges in Hard Rock with Nonparallel Joints in True Triaxial Stress States.ROCK MECHANICS AND ROCK ENGINEERING,56(2),997. |
| MLA | Zhang, Yan,et al."Fracture Evolution Analysis of Rock Bridges in Hard Rock with Nonparallel Joints in True Triaxial Stress States".ROCK MECHANICS AND ROCK ENGINEERING 56.2(2023):997. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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