基于IRSM的隧道顶板楔形体稳定性可靠度分析

doi:10.13722/j.cnki.jrme.2022.1338

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Abstract Stability analysis of roof wedge is an important means to assess the risk of tunnel roof instability，and uncertainty analysis methods are widely applied in the field of geotechnical engineering. For the low computational efficiency caused by the high nonlinearity of the real function of the wedge，the linear response surface function was used to approximately replace the function of wedge. At the same time，upgrading the selection of sampling points in traditional response surface method，a reliability method for tunnel roof wedge was proposed based on vector projection response surface method. Then，the traditional RSM was improved(IRSM). Basing on a classical failure model of wedge，the effectiveness of the method was verified. The influence of parameter variability，probability distribution type and correlation on tunnel stability were systematically discussed. The results show that the accuracy and efficiency of the proposed method is higher than first order reliability method and Monte Carlo simulation. IRSM can not only ensure the accuracy，but also avoid the gradient solution of complex nonlinear performance functions，greatly simplify the calculation process and significantly improve the efficiency. The uncertainty of rock and soil mass parameters has a significant impact on the failure probability of tunnel roof wedge. The uncertainty of rock and soil parameters has a significant impact on the failure probability of the tunnel roof wedge. The variability of effective friction angle and the positive correlation between joint effective friction angle and semi-apical angle have the most remarkable effect on the failure probability. It is recommended that the coefficient of variation COV = 0.2 should be the threshold for selecting the probability distribution.

Key words： tunnel engineering tunnel roof wedge vector projection response surface method reliability variability correlation

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	Articles by authors
	ZHANG Shichao1
	2
	GAO Qidong 1
	2
	WANG Yaqiong1
	2
	MA Xiaobo1
	2
	ZHOU Haixiao1
	2
	WANG Zhifeng1
	2

Cite this article:

ZHANG Shichao1,2,GAO Qidong 1, et al. Reliability analysis of tunnel roof wedge structure based on IRSM[J]. , 2023, 42(11): 2753-2764.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1338 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I11/2753

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