基于随机有限元的隧道衬砌结构可靠性分析

结合广州地铁三号线大塘站~沥窖站区间盾构隧道的实际情况,采用荷载-结构模式与蒙特卡罗-有限元法,选取不同的随机变量统计特征,进行了隧道衬砌结构可靠性分析,得出了隧道衬砌各截面处的抗压可靠指标与抗裂可靠指标。研究结果表明:拱顶处的轴力对上部水压最为敏感,弯矩对侧压力系数最为敏感,工程的支护体系能够满足目标可靠指标要求,具有足够的安全储备。

Analysis of Reliability of Tunnel Lining Structure Based on Random Finite Element

In the light of reality of shield - driven tunnel in interval of Datang to Lijiao Station at Line No. 3 of Guangzhou Subway, adopting the load - structiure mode and Monte Carlo Finite Element Method as wdll as selecting the different feature for random variable statistics, the paper analyzes reliability of tunnel lining structure and gets reliable indexes for compression - resistance and crack - resistance at every section of tunnel lining. Studied results show that the axial force at arch crown is most sensitive to upper water pressure,the moment is most sensitive to lateral pressure coefficient, and the supporting system of engineering is enabled to satisfy requirements for reliable index, having an adequate margin of safety.