基于微震监测与数值模拟的高应力软岩隧道围岩大变形特征分析

doi:10.13722/j.cnki.jrme.2023.1104

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Abstract The deterioration，fragmentation and dilation effects in high-stress soft rock tunnel surrounding rock are significant，making large deformation disasters in soft rock，a critical issue in the construction of long and deep tunnels. To clarify the process and mechanism of large deformation disasters in soft rock tunnels under high-stress conditions，a microseismic monitoring system(MS) was established in a soft rock tunnel. The deformation and failure processes of the surrounding rock under different support strengths were analyzed. Combining convergence monitoring and numerical simulation，the study examined the evolution of cracks and large deformation characteristics of the surrounding rock，revealing the mechanisms of internal fracturing and damage zone evolution under high-stress and strong unloading conditions. The results show that tunnel convergence in high-stress soft rock is closely related to geological conditions and support conditions. Due to nearly vertical joint development in the surrounding rock，deformation at the sidewalls of the tunnel exceeds that at the crown and floor under strong unloading. Different support forms exhibit distinct characteristics in tunnel convergence and MS parameters. Strong support reduces tunnel convergence，decreases daily MS frequency，reduces cumulative apparent volume，and lowers MS event energy and cumulative released energy. Numerical simulation studied the deformation and failure characteristics of the surrounding rock，and a comparative analysis between numerical simulation results and field tests indicated that the damage zone of the tunnel surrounding rock is approximately 8 meters. The study demonstrates that MS monitoring can reflect the large deformation and failure process of soft rock tunnels，providing a scientific basis for the design of support measures and timing in tunnel construction.

Key words： tunnel engineering large deformation of soft rock microseismic monitoring numerical simulation

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	Articles by authors
	LI Zhuang1
	XU Nuwen1
	SUN Zhiqiang2
	LIU Jun2
	LI Biao3
	SUN Yuepeng1
	ZHU Jianlin4

Cite this article:

LI Zhuang1,XU Nuwen1,SUN Zhiqiang2, et al. Analysis of large deformation characteristics of soft rock tunnel surrounding rock under high geo-stresses based on microseismic monitoring and #br# numerical simulation[J]. , 2024, 43(11): 2725-2737.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.1104 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I11/2725

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