砂化白云岩地层隧道掌子面失稳机制研究  

Study on the mechanism of instability of tunnel face in sandy dolomite stratum

作　　者：王志杰[1] 杜逸文 姜逸帆 吴凡 齐永立 周平[1] WANG Zhijie;DU Yiwen;JIANG Yifan;WU Fan;QI Yongli;ZHOU Ping(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;The 2nd Engineering Co.,Ltd.,of China Railway 16th Bureau Group,Tianjin 300162,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [2]中铁十六局集团第二工程有限公司,天津300162

出　　处：《岩石力学与工程学报》2021年第S02期3118-3126,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51678498);中央高校基本科研业务专项资金资助项目(SWJTU11ZT33);教育部创新团队发展计划资助项目(IRT0955)。

摘　　要：我国西南地区广泛分布着以白云岩为代表的碳酸盐岩,这种岩体在有水的情况下易出现砂化现象。以成昆复线吉新隧道工程为依托,采用超前地质预报、理论分析以及连续-离散耦合数值分析的方法,对砂化白云岩地层隧道掌子面失稳机制进行深入研究。研究结果如下:(1)根据超前地质预报的结果,分析得出白云岩砂化的机制及发展过程,总结出白云岩发生砂化的客观条件,以及掌子面失稳发生的条件;(2)采用连续-离散耦合数值模拟,对砂化白云岩隧道掌子面失稳进行全过程分析,总结了失稳发生后掌子面围岩的位移及破坏规律。以上研究对砂化白云岩地层隧道的进一步研究提供了理论基础。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.

关 键 词：隧道工程:砂化白云岩 失稳机制 连续-离散耦合 

分 类 号：U45[建筑科学—桥梁与隧道工程]