外水压下隧道围岩与衬砌的随机有限元分析  

Stochastic finite element analysis of surrounding rock and lining of tunnels under external water pressure

作　　者：丁浩[1,2,3] 蒋树屏[2,3] 杨林德[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]重庆交通科研设计院隧道工程所,重庆400067 [3]隧道建设与养护技术交通行业重点实验室,重庆400067

出　　处：《岩土工程学报》2009年第4期643-647,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家西部交通建设科技项目(200431800028)

摘　　要：为探讨在外水压力作用下隧道围岩和衬砌的力学承载特性,以龙潭隧道为依托,进行了随机有限元数值模拟。模拟采用了响应面法和蒙特卡罗模拟的手段,并进行了响应面方程拟合和概率敏感性及相关性的计算分析。分析结果表明,在外水压力的作用下,隧道衬砌的破坏形式以受压破坏为主,提高围岩弹性模量较衬砌弹性模量对改善衬砌承载外水压的力学性能更为有效。并在此基础上指出,外水压下的衬砌设计和隧道施工应考虑下述因素:围岩可以分担外水压力的承载特性、地层结构法的计算模型、注浆具有堵水和加固的双重效果。In order to investigate the bearing behaviors of surrounding rock and lining of tunnels under external water pressure, the numerical simulation based on the stochastic finite element method （SFEM） is conducted to analyze the behaviors of Longtan tunnel. In SFEM, the response surface method （RSM） and the Monte-Carlo method are adopted. In the analysis, the following calculations are made： i） fitting responsive surface equation, ii） analysis on probability sensitivities and correlations. It is shown that the failure mode of the lining under external water pressure is mainly compressive failure; the increase of the elastic modulus of surrounding rock is more effective than that of the lining. Based on the analysis, in lining design and tunnel construction under external water pressure, the following factors should be considered the beating characteristics of surrounding rock, the calculation model of layer structure method and the grouting effects including water plugging and reinforcement.

关 键 词：隧道 衬砌 围岩 外水压力 随机有限元 

分 类 号：U451[建筑科学—桥梁与隧道工程] U452.2[交通运输工程—道路与铁道工程]