Numerical Investigation of the Scale Effects of Rock Bridges
文献类型：期刊论文
| 作者 | Bu, Fengchang1,2,3; Xue, Lei1,2,3; Zhai, Mengyang1,2,3; Xu, Chao1,2,3; Cui, Yuan1,2,3 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2022-06-25 |
| 页码 | 15 |
| 关键词 | Rock bridge Scale effect Joint persistence Numerical simulation Acoustic emission |
| ISSN号 | 0723-2632 |
| DOI | 10.1007/s00603-022-02952-2 |
| 英文摘要 | Due to the challenge of measuring rock bridges in the field and the negligence of progressive damage and changes in stresses within a rock mass when defining rock bridges, it is questionable to evaluate mechanical properties of rock bridges using only geometric parameters. A demonstration is the scale effects of rock bridges, because the same geometric parameter may refer to different sizes and numbers of rock bridges, leading to erroneous equivalent rock mass responses. In this context, in-plane rock bridges in rock slope engineering were equivalent to rock bridges subjected to direct shear by conducting numerical simulations employing the Universal Distinct Element Code (UDEC) and described by constant geometric parameters, i.e., joint persistence, while the sizes and numbers of rock bridges were variant. In this way, the scale effects of rock bridges were investigated from the perspective of load-displacement curves, stress and displacement fields, crack propagations and AE characterizations. The results revealed that the mechanical properties of rock bridges deteriorated with decreasing scales. More specifically, the shear resistance and the area and value of stress concentration decreased with decreasing scale. Furthermore, an uneven distribution of displacement fields in an arc manner moving and degrading away from the load was observed, indicating the sequential failure of multiple rock bridges. It was also found that the propagation of tensile wing cracks was insensitive to scale, while the asperity of macro shear fracture mainly formed by secondary cracks decreased with decreasing scale. In addition, increasing the dispersion of rock bridges would overlap the failure precursors identified by intense AE activities. Based on the abovementioned results, the scale effects of rock bridges were characterized using existing rock bridge potential (RBP) index and degree of persistence (DoP) index. Interestingly, a scale threshold to possibly identify a rock bridge was found. |
| WOS关键词 | SHEAR BEHAVIOR ; CRACKING PROCESSES ; STRENGTH ; FAILURE ; SLOPE ; JOINTS ; MASS ; PERSISTENCE ; SYSTEM ; MODEL |
| 资助项目 | National Natural Science Foundation of China[41977249] ; National Natural Science Foundation of China[42090052] ; National Natural Science Foundation of China[U1704243] ; National Key Research and Development Program of China[2019YFC1509701] |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000815565100001 |
| 出版者 | SPRINGER WIEN |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation 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 Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation 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 Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation 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 Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation 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 Key Research and Development Program of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/105894]  |
| 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 | Xue, Lei |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Bu, Fengchang,Xue, Lei,Zhai, Mengyang,et al. Numerical Investigation of the Scale Effects of Rock Bridges[J]. ROCK MECHANICS AND ROCK ENGINEERING,2022:15. |
| APA | Bu, Fengchang,Xue, Lei,Zhai, Mengyang,Xu, Chao,&Cui, Yuan.(2022).Numerical Investigation of the Scale Effects of Rock Bridges.ROCK MECHANICS AND ROCK ENGINEERING,15. |
| MLA | Bu, Fengchang,et al."Numerical Investigation of the Scale Effects of Rock Bridges".ROCK MECHANICS AND ROCK ENGINEERING (2022):15. |
入库方式： OAI收割
来源：地质与地球物理研究所
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