砂化白云岩地层隧道掌子面失稳机制研究

doi:10.13722/j.cnki.jrme.2020.1153

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Abstract Carbonate rocks represented by dolomite are widely distributed in southwestern China. This kind of rock mass is prone to sanding when there is water. Based on the Chengdu-Kunming double-track Jixin tunnel project，this paper adopts advanced geological forecasting，theoretical analysis，and continuous-discrete coupled numerical analysis methods to conduct an in-depth study on the tunnel face instability mechanism in sandy dolomite formations. The results of the research are as following. (1) According to the results of advanced geological forecasts，the mechanism and development process of dolomite sandy are analyzed and the objective conditions for dolomite sanding are summarized. (2) Using continuous-discrete coupled numerical simulation，the whole process of the instability of the tunnel face of the sanded dolomite tunnel was analyzed，and the displacement and failure laws of the tunnel face surrounding rock after the instability occurred were summarized. The above research provides a theoretical basis for further research on tunnels in sandy dolomite formations.

Key words： tunnel engineering sandy dolomite instability mechanism continuous-discrete coupling

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	Articles by authors
	WANG Zhijie1
	DU Yiwen1
	JIANG Yifan1
	WU Fan1
	QI Yongli2
	ZHOU Ping1

Cite this article:

WANG Zhijie1,DU Yiwen1,JIANG Yifan1, et al. Study on the mechanism of instability of tunnel face in sandy dolomite stratum#br#[J]. , 2021, 40(S2): 3118-3126.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.1153 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/IS2/3118

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