基于蒙特卡罗有限元法分析运营中的厦门海底隧道荷载效应

Analysis of load effect of an operating subsea tunnel in Xiamen based on Monte Carlo finite element method

文中在总结运营公路隧道的荷载特点、概括影响隧道荷载效应各种因素及其统计特征的基础之上,运用蒙特卡罗有限元法对厦门海底隧道海域Ⅳ类围岩下左洞某断面二次衬砌的荷载效应和弯矩的统计特征进行了计算和分析.研究结果表明:厦门海底隧道海域Ⅲ级(Ⅳ类)围岩下左洞某断面的二次衬砌结构最大弯矩发生在仰拱处,最大轴力发生在拱脚处;衬砌拱顶、拱腰以及拱脚和仰拱处的弯矩不拒绝服从对数正态分布;衬砌拱顶、拱腰以及拱脚和仰拱处的荷载效应不拒绝服从正态分布.

After summing up the operating tunnels′loading features and the statistical characteristics from all the factors influencing tunnel load effect , this paper applies Monte Carlo finite element method to the analysis and calculation of the load effect and bending moment characteristics of a section′s secondary lining of the left hole , which is in Ⅳsurrounding rocks of sea area of Xiamen subsea tunnel .The conclusions are as follows：The maxi-mum bending moment , which is of a section′s secondary lining structure of the left hole under the Xiamen subsea tunnel grade Ⅲ（Ⅳ class） wall rock,occurs at the invert, and the maximum axial force is at the arch of the foot;the bending moment of lining vault , arch back , arch of the foot and invert do not refuse to obey a lognormal distribution;the load effect of lining vault , arch back , arch of the foot and invert do not refuse to obey the normal distribution .