Structural Engineering and Mechanics

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Deformation and failure mechanism exploration of surrounding rock in huge underground cavern

  • Tian, Zhenhua (China Institute of Water Resources and Hydropower Research) ;
  • Liu, Jian (Yalong River Hydropower Development Co., Ltd.) ;
  • Wang, Xiaogang (China Institute of Water Resources and Hydropower Research) ;
  • Liu, Lipeng (China Institute of Water Resources and Hydropower Research) ;
  • Lv, Xiaobo (Luoyun Water Project Management Division of Jiangsu province) ;
  • Zhang, Xiaotong (Luoyun Water Project Management Division of Jiangsu province)
  • Received : 2019.03.14
  • Accepted : 2019.07.17
  • Published : 2019.10.25
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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, $FLAC^{3D}$ 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.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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