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Structural Engineering and Mechanics Volume 72, Number 2, October25 2019 , pages 275-291 DOI: https://doi.org/10.12989/sem.2019.72.2.275 |
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Deformation and failure mechanism exploration of surrounding rock in huge underground cavern |
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Zhenhua Tian, Jian Liu, Xiaogang Wang, Lipeng Liu, Xiaobo Lv and Xiaotong Zhang
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| Abstract | ||
| In a super-large underground with \"large span and high side wall\", it is buried in mountains with uneven lithology, complicated geostress field and developed geological structure. These surrounding rocks are more susceptible to stability issues during the construction period. This paper takes the left bank of Baihetan hydropower station (span is 34m) as a case study example, wherein the deformation mechanism of surrounding rock appears prominent. Through analysis of geological, geophysical, construction and monitoring data, the deformation characteristics and factors are concluded. The failure mechanism, spatial distribution characteristics, and evolution mechanism are also discussed, where rock mechanics theory, FLAC3D numerical simulation, rock creep theory, and the theory of center point are combined. In general, huge underground cavern stability issues has arisen with respect to huge-scale and adverse geological conditions since settling these issues will have milestone significance based on the evolutionary pattern of the surrounding rock and the correlation analyses, the rational structure of the factors, and the method of nonlinear regression modeling with regard to the construction and development of hydropower engineering projects among the worldwide. | ||
| Key Words | ||
| hydropower station, underground engineering, surrounding rock deformation, multi-point displacement, monitoring model | ||
| Address | ||
| Zhenhua Tian/China Institute of Water Resources and Hydropower Research Jian Liu/Yalong River Hydropower Development Co Xiaogang Wang/State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin Lipeng Liu/State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin Xiaobo Lv/Luoyun Water Project Management Division of Jiangsu province Xiaotong Zhang/Luoyun Water Project Management Division of Jiangsu province | ||