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Estimation of the three-dimensional in situ stress field around a large deep underground cavern group near a valley

Journal of Rock Mechanics and Geotechnical Engineering 2021年第3期13卷 529-544页

作者： Dingping Xu Xiang Huang Quan Jiang Shaojun Li Hong Zheng Shili Qiu Huaisheng Xu Yonghong Li Zhiguo Li Xingdong Ma State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China POWERCHINA Chengdu Engineering Corporation Limited Chengdu610072China

Understanding three-dimensional(3D)in situ stress field is of key importance for estimating the stability of large deep underground cavern groups near ***,the complete 3D in situ stress fields around large deep underground cavern groups are difficult to determine based on in situ stress data from a limited number of measuring points due to the insufficient representativeness and unreliability of such *** this study,an integrated approach for estimating the 3D in situ stress field around a large deep underground cavern group near a valley is developed based on incomplete in situ stress measurements and the stress-induced failures of tunnels excavated prior to the step excavation of the cavern *** integrated approach is implemented via four interrelated and progressive basic steps,*** of the regional tectonic stress field direction,analyses of in situ stress characteristics and measurement reliability,regression-based in situ stress field analysis and reliability assessment,and modified in situ stress field analysis and reliability *** orientations and magnitudes of the 3D in situ stress field can be analyzed and obtained at a strategic level following these four basic ***,the tectonic stress field direction around the cavern group is deduced in accordance with the regional tectonic framework and verified using a regional crustal deformation velocity ***,the reliability of the in situ stress measurements is verified based on the locations and depths of stressinduced brittle failures in small tunnels(such as exploratory tunnels and pilot tunnels)within the excavation range of the cavern ***,considering the influences of the valley topography and major geological structures,the 3D in situ stress field is regressed using numerical simulation and multiple linear regression techniques based on the in situ stress ***,the regressed in situ stress field is further modified and reveri

关键词： underground cavern group In situ stress Stress-induced brittle failure Spalling depth Numerical simulation

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Research on Country Rock Stability of underground cavern group of Dachaoshan Hydroelectric Station

Research on Country Rock Stability of Underground Cavern Gro...

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2004安全科学与技术国际会议

作者： SHEN Jun1 2 GU Jincai2 ZHANG Xiangyang2 & CHEN Anmin2 (1 University of Science and Technology of China Hefei 230026 Anhui China) (2 The Third Institute of the Corps of Engineers of PLA Luoyang 471023 Henan China)

This paper uses the method of combining model test with numerical calculation to study the effect of excavation of underground cavern group on the country rocks stability, and gives the variation of t

关键词： underground cavern group supporting scheme model test numerical calculation

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