高地应力隧道台阶法施工过程数值模拟  

Numerical Simulation on Construction Process of High Ground Stress Tunnel by Bench Method

作　　者：赵佃锦[1,2] 梁庆国[1,2] 鲁得文[1,2] 尹庭杰 高勤运 

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]甘肃省道路桥梁与地下工程重点实验室,兰州730070 [3]中铁第一勘察设计院有限公司,西安710043

出　　处：《地下空间与工程学报》2014年第2期441-448,共8页Chinese Journal of Underground Space and Engineering

基　　金：兰州交通大学"青蓝"人才工程项目(QL-08-19A)资助;长江学者和创新团队发展计划资助(IRT1139)

摘　　要：结合高地应力区兰渝铁路某隧道实际施工方法,运用有限元分析软件MIDASGTS进行隧道三台阶法开挖数值模拟分析,通过选取合适物理力学参数进行建模,从模型中提取围岩位移、塑性区、二衬位移、轴力、弯矩等数据进行分析,通过对比分析,得出台阶法施工中应加强支护部位及支护控制措施(如超前支护、拱腰、拱脚加密锁脚锚管等),二衬受力、变形随侧压力系数变化趋势、二衬安全系数等,并和隧道实际监测数据进行对比分析,验证数值模拟的合理性和正确性,可以为高地应力隧道设计施工提供有益的参考。In this paper the finite element analysis software MIDAS-GTS is used to simulate and analyze the ex- cavation of tunnel by three-step method, combined with the practical construction method used in a carbonaceous phyllite tunnel at Lanzhou-Chongqing railroad located in Class V weak high ground stress area. Appropriate physical and mechanical parameters from code for design of railway tunnel are selected to establish the model, data such as the surrounding rock deformation, plastic zone, secondary lining displacement, axial force and bending moment are ex- tracted for analysis. It is concluded that the supporting parts should be sirengthened and the supporting control meas- ures be adopted （ such as advaneed support, arch, arch foot encrypted with lock anchor pipe etc. ） besides, the force in secondary lining, variation trend of deformation vs. lateral pressure coefficient, the safety coefficient of see- ondary lining ete. are obtained from the model and compared with the actual monitoring data of the tunnel, the con- clusion is that the numerical simulation is correct and rational, which can serve as useful reference for design and construction of high ground stress tunnel.

关 键 词：高地应力 MIDAS-GTS 台阶法 侧压力系数 

分 类 号：U25[交通运输工程—道路与铁道工程]