一种大跨度地下洞室群经验设计系统及其应用

doi:10.13722/j.cnki.jrme.2023.0163

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Abstract The support design of large underground caverns is a complicated non-linear issue that is related to geology，rock mechanics，cavern geometry，excavation method，etc. In order to solve the shortcomings of the empirical support design system，such as Q，RMR，design code，etc.，which are lack of consideration for the influence of the strength of the rock mass，the geo-stress and the cavern geometry characteristics，a new comprehensive index D is proposed，which is including，rock mass quality，peak strength and residual strength of the rock mass，geo-stress，cavern geometry，and the excavation method. The scoring table for each factor is proposed. A new function for evaluating support pressure and determining the thickness of rock pillars for adjacent cavern complexes，is created based on D and the span of caverns. Detail recommendations for support design include various combinations of shotcrete，rock bolts，prestressed anchor cables，steel ribs and concrete lining，and the suggestion for the spacing and length of rock bolts or prestressed anchor cables，the requisite thickness of the shotcrete，and the locked force of prestress anchor cables is also proposed. This new design system is verified using more than 45 large underground caverns of different hydroelectric power projects worldwide. This design system can be used as a general empirical system to guide the design of underground cavern or cavern group.

Key words： rock mechanics underground caverns large span design system rock mass quality peak strength residual strength support pressure rock bolts pre-stressed anchor cables shotcrete

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	Articles by authors
	ZHANG Chunsheng1
	CHU Weijiang1
	2
	WU Jiayao1
	2
	CHEN Jianlin1
	ZHU Yongsheng1
	2
	CAO Aiwu1
	2
	MENG Guotao1
	2

Cite this article:

ZHANG Chunsheng1,CHU Weijiang1,2, et al. An empirical design system for large underground caverns and its application[J]. , 2023, 42(12): 2861-2875.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0163 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I12/2861

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