岩溶地区隧道衬砌受力及变形特征的有限元分析

摘要

运用ABAQUS有限元分析软件,结合岩溶地区山岭隧道的工程实例,建立隧道施工过程的三维有限元模型,研究了岩溶地层对隧道围岩和初期支护结构受力和变形的影响.结果表明:在岩溶地区开挖隧道,衬砌拱顶承受较大的应力而边墙部分承受较小的应力;边墙及拱顶均存在下沉现象,且位移呈直线增长趋势,隧道围岩底部存在一定程度的反拱现象.%In this paper,a three-dimensional finite element model of the tunnel construction process is established and the influence of karst stratum on the stress and deformation of tunnel surrounding rock and initial support structure is studied based on the engineering example of the mountain tunnel in the karst area and used ABAQUS finite element analysis software.The following conclusions were drawn:the tunnel lining vault is subjected to a larger stress and the side wall is subjected to a smaller stress.The side wall and the vault have subsidence and the displacement increases linearly.The bottom of the tunnel surrounding rock has a certain degree of reverse arch phenomenon.