隧道围岩开挖及锚喷衬砌稳定可靠度计算

doi:10.13722/j.cnki.jrme.2018.1303

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Abstract A calculation formula for the radial displacement of surrounding rock was derived according to the convergence analysis of linear elasticity of surrounding rock，and a solving method of the support resistance of shotcrete lining and rockbolts was determined based on the thin-wall cylinder theory and the point anchored reinforcement theory. Performance functions involving excavation of the surrounding rock as well as rockbolt- shotcrete support were deduced. Aiming at the problem that the common second order reliability method(SORM) could not be applied directly due to that the performance functions were highly nonlinear and implicit，a calculation formula of gradient vectors，instead of the analytical algorithm used in common SORM，was deduced based on the difference principle，and a direct calculation method for stability reliability of tunneling structure，which is free from the constraint of the performance function form，was proposed. A tunnel project was analyzed by the developed method，and comparison between the calculation results by the method and Monte-Carlo method was performed. It is shown that the developed method is widely applicable and accurate. Meanwhile，a suitable step length coefficient v = 0.01 which has universally applicable meaning in the independent standard normal space was suggested.

Key words： tunnel engineering rockbolts and shotcrete support reliability step length coefficient

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	Articles by authors
	LI Shuai1
	DU Junwang1
	SU Yonghua2
	DING Xinxiang1

Cite this article:

LI Shuai1,DU Junwang1,SU Yonghua2, et al. Calculation of stability reliability for the surrounding rock excavation and rockbolt-shotcrete support in tunnel structure#br#[J]. , 2019, 38(8): 1627-1634.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1303 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I8/1627

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