双连拱隧道施工力学数值模拟与施工方法比选  

Numerical Dynamic Simulation of the Construction Mechanics and Comparison and Choice of the Construction Method in the Bi-arch Tunnel of Express Highway

作　　者：赵玉光[1] 张焕新 林志远 李晓洪[1] 杨峥[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]广东省广惠高速公路有限公司,广东广州510630

出　　处：《广西交通科技》2003年第4期25-30,共6页Guangxi Communication Science & Technology

基　　金：广东省交通厅科技项目“软弱围岩双跨连拱高等级公路隧道综合修建技术研究”(粤交科函[2002]1507号)

摘　　要：针对广惠高速公路小金口双连拱隧道在不同施工方法下围岩和隧道支护结构的力学问题,运用有限元的方法对三导坑开挖法和上下台阶开挖法进行了动态数值模拟,首次建立了在不同施工工序下围岩的应力场、位移场,进而对这两种施工方法进行了比较,得出采用上下台阶法开挖的方案较优。所建立的双连拱隧道支护结构体系内力(轴力和弯矩)模型,对双连拱隧道的设计和施工具有重大的指导意义。Based on the Xiaojinkou bi-arch tunnel engineering of the Guanghui(Guangzhou-Huizhou) highway, the paper studies the mechanics problem of the excavating and supporting during the bi-arch tunnel construction in the soft surrounding rock The excavating procedure of three heading and top and bottom benching has been simulated numerically by the finite element method(FEM) calculation The field of stress and displacement in the surrounding rock has been suggested firstly under the different order of the construction By comparison of the two methods, the scheme of top and bottom benching is much better than that of the three heading At the same time, the internal forces model (axel forces, bending moment and so on) of the support structure system of the bi-arch tunnel has been set up firstly The results have important guiding significance for the design and construction of the bi-arch tunnel

关 键 词：软弱围岩 双连拱隧道 有限元 三导坑开挖法 上下台阶开挖法 施工方法 力学分析 数值模拟 

分 类 号：U455.4[建筑科学—桥梁与隧道工程] U451.2[交通运输工程—道路与铁道工程]