高地应力地下洞室群开挖过程岩体力学响应及破坏机制

doi:10.19952/j.cnki.2096-5052.2021.03.09

Hazard Control in Tunnelling and Underground Engineering

2021, Vol. 3

Issue (3): 85-93 DOI: 10.19952/j.cnki.2096-5052.2021.03.09

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Mechanical response and failure mechanism of rock mass during excavation of underground caverns under high geostress

HUANG Xiao, XIAO Peiwei, DONG Linlu, YANG Xingguo, XU Nuwen^*

State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, Sichuan, China

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Abstract The underground caverns of a hydropower station under construction are large in scale, with high side walls and large span.The deformation, stress evolution and plastic zone distribution characteristics of surrounding rock mass during layered excavation of underground caverns were studied by numerical simulation method, and the deformation and failure mechanism of surrounding rock mass was analyzed based on the results. Results showed that the failure of surrounding rock mass in the early excavation of the caverns was dominated generally by stress, and gradually changed to dominated by structural plane with the increase of excavation face. The numerical simulation results revealed the failure characteristics of hard rock with high in situ stress under the influence of structural plane, which could provide reference for the formulation of excavation measures and support design of caverns.

Key words： underground caverns discrete element method failure mechanism high geostress rock structures

Received: 31 May 2021 Published: 20 September 2021

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	HUANG Xiao
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Cite this article:

HUANG Xiao,XIAO Peiwei,DONG Linlu, et al. Mechanical response and failure mechanism of rock mass during excavation of underground caverns under high geostress[J]. Hazard Control in Tunnelling and Underground Engineering, 2021, 3(3): 85-93.

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http://tunnel.sdujournals.com/EN/10.19952/j.cnki.2096-5052.2021.03.09 OR http://tunnel.sdujournals.com/EN/Y2021/V3/I3/85

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