不同场地条件下水下隧道周围土体位移变化的数值分析

Numerical Analysis of Underwater Tunnel Surrounding Soil Displacement in the Conditions of Different Sites

以拟建的哈尔滨松花江隧道为背景,考虑土体—衬砌的材料非线性特性和相互作用,按平面应变假定,建立在不同场地条件下的若干接近实际的有限元计算模型,应用有限元计算软件ANSYS进行数值分析,得出不同场地条件下隧道周围土体位移的分布规律,遴选出了影响水下隧道周围土体变形的部分关键因素,为合理确定隧道覆土层安全厚度提供了一定的理论依据。

Under the background of Songhua river tunnel project to be built in Harbin,this paper focus on the material nonlinearity of soil mass and linings as well as interactions between them.Some FEM calculation models are established under different site conditions based on plane strain assumption.The distributions of soil displacement around the tunnel under different site conditions are researched by numerical calculation with ANSYS.Some key factors which influence the soil deforming around the tunnel are defined and theoretical references are provided to determine the safety thickness of overburden of the tunnel.