Failure modes and excavation stability of large-scale columnar jointed rock masses containing interlayer shear weakness zones
文献类型：期刊论文
| 作者 | Zhao, Danchen1,2; Xia, Yingjie1,2,3; Zhang, Chuanqing3,4; Tang, Chun 'an1,2; Zhou, Hui3,4; Liu, Ning5; Singh, Hemant Kumar6; Zhao, Zhenxing7; Chen, Jun5; Mu, Chaoqian1 |
| 刊名 | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
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| 出版日期 | 2022-11-01 |
| 卷号 | 159期号:-页码:- |
| 关键词 | Columnar jointed rock mass Underground powerhouses Interlayer shear weakness zones Numerical calculations Mechanical properties |
| ISSN号 | 1365-1609 |
| 英文摘要 | The mechanical properties of large-scale columnar jointed rock masses (CJRMs) after excavation would be reduced due to the unloading relaxation, in addition to its influence on the stability of underground caverns. Moreover, the cutting of the interlayer shear weakness zones through the cavern complicates the overall stability of CJRM, and brings challenges to the stability control of project. In view of such problems encountered during the construction of underground caverns, we reconstructed the large-scale CJRMs containing interlayer shear weakness zones to conduct the 3D rock failure process analysis. The numerical models of surge tank caverns during excavation were established and the mechanical properties, failure modes and acoustic emission (AE) characteristics were analyzed. The simulation results indicate that the large-scale columnar joints and C2 interlayer shear weakness zones influence the mechanical properties and failure modes significantly. Three types of damage modes in numerical models containing crush-shear failure along columnar joints, tensile-slip failure along C2 interlayer shear weakness zone and crush failure inside and around caverns were summarized. The concentration zones of tensile stress were found around each cavern and gradually shrunk from sector shape to linear shape. The caverns were divided into two parts along C2 shear weakness zone in the process of X stress loading and two sector damage zones occurring on both horizontal sides of each cavern. In the process of Y stress loading, some crack networks consisting of large-scale columnar joints, intralayer joints and C2 shear weakness zone were formed which led to the complete failure of the numerical models. A new method based on BP neural network was proposed to evaluate the stability of rock mass with large-scale columnar joints and interlayer shear weakness zones. The training results show that the method can distinguish the stability of rock mass well, while its accuracy reaches 97.6%. |
| 学科主题 | Engineering ; Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:000860514400001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35460]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China 2.School of Civil Engineering, Dalian University of Technology, Dalian, 116024, China 3.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China 4.University of Chinese Academy of Sciences, Beijing, 100049, China 5.Power China Huadong Engineering Corporation, Hangzhou, 310014, China 6.Department of Petroleum Engineering and Geoengineering, Rajiv Gandhi Institute of Petroleum Technology, Jais, Amethi, 229304, U.P., India 7.China Railway Construction Bridge Engineering Bureau Group 3rd Engineering Co., Shenyang, 110043, China |
| 推荐引用方式 GB/T 7714 | Zhao, Danchen,Xia, Yingjie,Zhang, Chuanqing,et al. Failure modes and excavation stability of large-scale columnar jointed rock masses containing interlayer shear weakness zones[J]. INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,2022,159(-):-. |
| APA | Zhao, Danchen.,Xia, Yingjie.,Zhang, Chuanqing.,Tang, Chun 'an.,Zhou, Hui.,...&Mu, Chaoqian.(2022).Failure modes and excavation stability of large-scale columnar jointed rock masses containing interlayer shear weakness zones.INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,159(-),-. |
| MLA | Zhao, Danchen,et al."Failure modes and excavation stability of large-scale columnar jointed rock masses containing interlayer shear weakness zones".INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 159.-(2022):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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