中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Influence of water on rockburst of surrounding rock in deep circular tunnels under triaxial internal unloading conditions

文献类型:期刊论文

作者Wu, Wuxing1,3; Gong, Fengqiang1,2; Jiang, Quan2
刊名TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
出版日期2023-08-01
卷号138页码:18
关键词Rockburst Spalling Hard -rock tunnel Water content Triaxial unloading Strength weakening effect
ISSN号0886-7798
DOI10.1016/j.tust.2023.105165
英文摘要Rockburst is one of the most serious engineering geological hazards encountered in deep rock mass. In this study, we investigate the influence of water on the rockburst mechanism in circular tunnels considering the whole stress path of high in situ stress + internal unloading + stress adjustment, based on external loading-internal unloading (ELIU) tests on intact air-dried and saturated sandstone cubic specimens (100 x 100 x 100 mm3). The proposed ELIU method uses true triaxial equipment to first load each intact cubic specimen with two-dimensional high stresses, followed by an internal drilling device for internal unloading to form circular holes. For comparison, cubic specimens with predrilled holes 25 mm in diameter were subjected to internal drilling - external loading (IDEL) tests, i.e., drilling first and then loading. The results show that water reduces the uniaxial compressive strength, Young's and initial moduli, and elastic energy storage capacity of sandstone materials, and increases the significance of shear failure. Furthermore, saturated tunnel structures induce static spalling failure, while dry tunnels lead to dynamic rockburst failure. The influence of water on the stability of the rock mass surrounding a tunnel is analyzed, including the induced weakening of surrounding rock strength and the amplification of the unloading effect. In summary, water prevents rockburst through the following mechanism: (i) water reduces the brittleness of the surrounding rock and enhances its plasticity; (ii) water reduces the elastic energy storage capacity and increases the energy dissipation capacity of the plastic zone; and (iii) water induces the redistribution of stress throughout the surrounding rock, which reduces the stress concentration near the free surface and transfers the maximum stress to the deeper surrounding rock.
资助项目National Natural Science Foundation of China[Z020005] ; Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[2242022k30054] ; Fundamental Research Funds for the Central Universities ; [42077244]
WOS研究方向Construction & Building Technology ; Engineering
语种英语
WOS记录号WOS:001054920900001
出版者PERGAMON-ELSEVIER SCIENCE LTD
源URL[http://119.78.100.198/handle/2S6PX9GI/39299]  
专题中科院武汉岩土力学所
通讯作者Gong, Fengqiang
作者单位1.Southeast Univ, Minist Educ, Engn Res Ctr Safety & Protect Explos & Impact, Nanjing 211189, Peoples R China
2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
3.Southeast Univ, Sch Civil Engn, Nanjing 211189, Peoples R China
推荐引用方式
GB/T 7714
Wu, Wuxing,Gong, Fengqiang,Jiang, Quan. Influence of water on rockburst of surrounding rock in deep circular tunnels under triaxial internal unloading conditions[J]. TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY,2023,138:18.
APA Wu, Wuxing,Gong, Fengqiang,&Jiang, Quan.(2023).Influence of water on rockburst of surrounding rock in deep circular tunnels under triaxial internal unloading conditions.TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY,138,18.
MLA Wu, Wuxing,et al."Influence of water on rockburst of surrounding rock in deep circular tunnels under triaxial internal unloading conditions".TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 138(2023):18.

入库方式: OAI收割

来源:武汉岩土力学研究所

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