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.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
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)
关键词
隧道
衬砌
围岩
外水压力
随机有限元
tunnel
lining
surrounding rock
external water pressure
stochastic finite element
