Role of Unloading Rate and Minimum Principal Stress on Fault Activation with Implication in Fault-Slip Rockburst
文献类型：期刊论文
| 作者 | Wang, Wei2,3; Meng, Fanzhen2,3; Tian, Dongliang2,3; Wen, Yuantao2; Yue, Zhufeng2,3; Cai, Qijin2; Zhou, Hui1 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2025-01-30 |
| 页码 | 24 |
| 关键词 | Fault-slip rockburst Unloading rate Fault activation Initial minimum principal stress Time-delayed failure |
| ISSN号 | 0723-2632 |
| DOI | 10.1007/s00603-024-04378-4 |
| 英文摘要 | Fault-slip rockburst in deep mining and hard rock tunneling is primarily induced by fault activation. In this study, the evolutionary process of the unloading-induced fault activation was analyzed by true triaxial unloading tests on pre-fractured specimens, and the influence of the unloading rate of sigma 3 (minimum principal stress) and initial sigma 3 value on fault activation was investigated. Intact specimens were also tested for comparison. The activation process was studied with the aid of acoustic emission and deformation monitoring. Our results indicate that asperities on original macro fracture have sufficient time to degrade gradually at a low unloading rate, and a higher unloading rate usually leads to a smaller unloading extent of sigma 3 at the moment of fault activation, resulting in less deformation (Delta epsilon 3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta \varepsilon_{3}$$\end{document}) in the direction of sigma 3. Moreover, the evolution of acoustic emission (AE) hit rate was divided into inactive phase and rapid increase phase during the unloading process, and both the duration of the rapid increase phase and the proportion of rapid increase duration to whole unloading duration decrease with increasing unloading rate. The initial sigma 3 value is inversely related to the unloading extent of sigma 3 and Delta epsilon 3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta \varepsilon_{3}$$\end{document}, while it is proportional to the post-peak stress drop and the amount of gouge within the post-failure specimens, which indicates that a larger initial sigma 3 intensifies the damage of the fault. Our results also show that the sigma 3 value at which fault activation occurs can be predicted by the single weak plane theory during the unloading of sigma 3. The time-delayed failure observed in three intact and one pre-fractured specimen shows that time-delayed rockburst in deep tunnels can be induced by the unloading of sigma 3. The strength for pre-fractured specimens in both loading and unloading tests is well fit by the Mogi-Coulomb strength criterion, and the cohesion is smaller while the friction is greater in the unloading tests than in loading-induced fault activation. The findings contribute to a better understanding on the unloading- induced fault-slip process and the mechanism of slip rockburst. |
| 资助项目 | Key projects of the Yalong River Joint Fund of the National Natural Science Foundation of China[U23B20147] ; National Key Research and Development Program of China[2022YFE0137200] ; Taishan Scholars Program |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001409409800001 |
| 出版者 | SPRINGER WIEN |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/37465]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Meng, Fanzhen |
| 作者单位 | 1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China 2.Qingdao Univ Technol, Coll Sci, Qingdao 266033, Shandong, Peoples R China 3.Qingdao Univ Technol, Sch Civil Engn, Qingdao 266033, Shandong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Wei,Meng, Fanzhen,Tian, Dongliang,et al. Role of Unloading Rate and Minimum Principal Stress on Fault Activation with Implication in Fault-Slip Rockburst[J]. ROCK MECHANICS AND ROCK ENGINEERING,2025:24. |
| APA | Wang, Wei.,Meng, Fanzhen.,Tian, Dongliang.,Wen, Yuantao.,Yue, Zhufeng.,...&Zhou, Hui.(2025).Role of Unloading Rate and Minimum Principal Stress on Fault Activation with Implication in Fault-Slip Rockburst.ROCK MECHANICS AND ROCK ENGINEERING,24. |
| MLA | Wang, Wei,et al."Role of Unloading Rate and Minimum Principal Stress on Fault Activation with Implication in Fault-Slip Rockburst".ROCK MECHANICS AND ROCK ENGINEERING (2025):24. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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。