深长隧道断层带施工方案优化  

Optimization of construction of deep-buried long tunnel through faults

作　　者：李兵[1] 金爱兵[1] 王宇[1] 邓富根[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《长安大学学报（自然科学版）》2011年第6期66-71,共6页Journal of Chang’an University(Natural Science Edition)

基　　金：长江学者和创新团队发展计划资助项目(IRT0950)

摘　　要：以某高速公路隧道断层带施工为工程背景,采用FLAC3D数值分析法对隧道断层破碎带施工进行动态开挖模拟,对比分析了中隔壁法和上下台阶法2种方案引起的力学响应。研究结果表明:断层带围岩变形主要受最大主应力控制,剪应变主要呈"沿隧道纵向中间小两边大,沿断面竖向两边小中间大,沿断面横向右边小左边大"的变化趋势;围岩破坏主要为剪切破坏,断层上盘为最危险地带;此工程背景下,中隔壁法优于上下台阶法,中隔壁法导坑一的施工是关键环节。The construction of fault is used as project background in Zhangcheng highway tunnel,the dynamic excavation of tunnel is simulated in fault by means of FLAC3D,the center diagram method and bench cut method are adopted,and the mechanical response of the two methods are comparatively analyzed.The results show that the fault rock is mainly controlled by the maximum principal stress,the shear strain is mainly a trend of the center is smaller than both sides along the fault,both sides are smaller than the center along the vertical section,the right side is smaller than the left along the horizontal section.The surrounding rock mass are mainly shear failure,the upper wall is the most dangerous.In the context of this project,the center diagram method is better than bench cut method,the heading one is the key to center diagram method.

关 键 词：隧道工程 断层 深埋特长隧道 中隔壁法 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]