“2S+”大型地下洞室支护设计方法与应用

doi:10.13722/j.cnki.jrme.2021.1343

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Abstract Based on the analysis of failure characteristics of multiple underground engineerings under high in-situ stress condition，the mechanical behavior of rock before and after peak is incorporated into the support design of underground engineering. This paper establishes the stress-strength design method for huge underground engineering considering initial strength index and post-peak brittle-ductile transformation factor. The established support design method pays full attention to the rock crack propagation mechanism and post-peak mechanical behaviour. The initial strength index(ISI) is defined by the ratio of the crack initial strength of rock under uniaxial compression to the maximum principal stress of geostress，which reflects the crack propagation mechanism of rock and the initial stress level of surrounding rock. The post-peak brittle-ductile transformation factor (BDF) is defined by the decreasing rate of rock brittleness within engineering confining pressure，which demonstrates the magnitude and rate of post-peak stress reduction and rock brittleness. The support strength is obtained according to the basic principle of convergence-confinement method. A seven-zone evaluation system of surrounding rock failure mode and support design is established based on the statistical results of ISI，BDF and support strength of surrounding rock of several typical huge underground engineerings. The failure modes and support parameters of huge underground engineerings in Baihetan，Jinping II，Jiangbian，Yangfanggou hydropower station and Yixing pumped storage power station show the rationality and applicability of the established support design method.

Key words： rock mechanics initial strength index post-peak brittle-ductile transformation factor huge underground caverns surrounding rock failure support design

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	Articles by authors
	ZHANG Chunsheng1
	LIU Ning1
	CHEN Jianlin1
	CHU Weijiang1
	GAO Yaohui1
	ZHANG Chuanqing2
	GAO Yang2

Cite this article:

ZHANG Chunsheng1,LIU Ning1,CHEN Jianlin1, et al. “2S+” support design method for huge underground caverns and its practical application[J]. , 2023, 42(1): 51-64.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1343 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I1/51

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