摘要
山岭隧道在施工过程中常同时穿越多条近平行的断层系,极易引起开挖面岩体失稳、围岩大变形、塌方等地质灾害。基于问腰隧道工程,以穿越近平行双断层破碎带的山岭隧道为对象,采用FLAC 3D软件对其分层开挖过程进行数值模拟分析,研究了近平行双断层破碎带的间距与倾角对围岩变形特性的影响规律。研究结果表明:断层破碎带为隧道施工开挖的薄弱部位,其位移量值明显大于上、下两盘内围岩位移量值;当两条近平行断层带间距为10m时,两条断层破碎带内隧道开挖所诱发的围岩位移将产生明显相互干涉影响,其量值大于单条断层破碎带内围岩位移量值;随着平行断层带倾角的增大,围岩位移量值逐渐减小;平行断层带间距越小,破碎带内围岩位移量值越大。
During the construction process of mountain tunnels,multiple subparallel fault systems are often crossed simultaneously,which can easily cause geological disasters such as instability of the excavation face rock mass,large deformation of the surrounding rock,and collapse and so on.Based on the Wenyao tunnel project,taking the mountain tunnel crossing the subparallel double fault fracture zone as the object,the numerical simulation and analysis on the layered excavation process is made by using FLAC 3D software,and the influence law of the spacing and inclination angle of the subparallel double fault fracture zone on the deformation characteristics of the surrounding rock is studied.The research results show that:the fault fracture zone is the weak part of tunnel construction and excavation,and its displacement value is significantly greater than the displacement value of the surrounding rock in the upper and lower panels;when the distance between two subparallel fault zones is 10m,the displacement of the surrounding rock induced by tunnel excavation in the two fault fracture zones will have a significant mutual interference effect,which is greater than the displacement of the surrounding rock in a single fault fracture zone;as the inclination angle of the parallel fault zone increases,the displacement value of the surrounding rock gradually decreases;the smaller the distance between the parallel fault zones,the greater the displacement value of the surrounding rock in the fractured zone.
作者
王禹淇
李忠义
王可
孙庆慈
张涛
Wang Yuqi;Li Zhongyi;Wang Ke;Sun Qingci;Zhang Tao(China Railway Beijing Engineering Bureau Group(Tianjin)Engineering Co.,Ltd.,Tianjin 300356,China;China Railway Communications Investment Group Co.,Ltd.,Nanning 530219,China;China Railway NO.2 Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《北方交通》
2023年第12期78-82,共5页
Northern Communications
关键词
公路隧道
平行断层
围岩变形
数值模拟
Highway tunnel
Parallel fault
Deformation of surrounding rock
Numerical simulation
