隧洞开挖过程中围岩安全系数演化特征与支护时机选择方法研究

doi:10.13722/j.cnki.jrme.2018.1260

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Abstract A novel methodology is proposed to determine the timing of initial support installation via the numerical simulation by FLAC3D. The point safety factor is introduced to evaluate the stability of each rock zone on the excavation boundary. And the geometric mean of all point safety factors is defined as the global safety factor to evaluate the overall stability，which avoids selecting limited and specific monitoring points. Then，the comprehensive graphic relationship between global safety factor and distance to tunnel face is established. Once global safety factor decreases to an admissible value，the stability of surrounding rock is in critical state and the corresponding distance in graphic relationship is the recommended location for installing initial support. In these procedures，the installation time of initial support at the typical tunnel section can be quickly designed and fed back during construction，which is efficient and effective. Meanwhile，several cases with different conditions have been carried out to validate the regularity of the method.

Key words： tunnelling engineering excavation safety factor rock mass stability support installation time

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	Articles by authors
	SU Kai
	ZHANG Yanjun
	WU Hegao
	ZHOU Li

Cite this article:

SU Kai,ZHANG Yanjun,WU Hegao, et al. Evolution of surrounding rock safety factor and support installation time during tunnel excavation[J]. , 2019, 38(S1): 2964-2975.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1260 OR http://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2964

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