Study on the mechanism of instability of tunnel face in sandy dolomite stratum#br#
WANG Zhijie1，DU Yiwen1，JIANG Yifan1，WU Fan1，QI Yongli2，ZHOU Ping1
(1. Key Laboratory of Transportation Tunnel Engineering，Ministry of Education，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. The 2nd Engineering Co.，Ltd.，of China Railway 16th Bureau Group，Tianjin 300162，China)
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.
王志杰1，杜逸文1，姜逸帆1，吴 凡1，齐永立2，周 平1. 砂化白云岩地层隧道掌子面失稳机制研究[J]. 岩石力学与工程学报, 2021, 40(S2): 3118-3126.
WANG Zhijie1，DU Yiwen1，JIANG Yifan1，WU Fan1，QI Yongli2，ZHOU Ping1. Study on the mechanism of instability of tunnel face in sandy dolomite stratum#br#. , 2021, 40(S2): 3118-3126.
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2021, Vol. 40 
