地铁车站单双层过河段沉降计算分析

On Differentiation Subsidence between Monolayer and Double-deck Metro Stations

探讨地铁车站单双层地铁站过河段沉降差,采用土的Coulomb-Mohr破坏与屈服准则建立模拟施工过程(包括土体自重变形、开挖、回填等)的三维有限元力学模型,得到施工过程引起的周围岩土应力变化、沉降变形以及地铁单双层过河段的沉降差值。单双层车站最大沉降控制在3cm以内,最大沉降差控制在1cm以内,能够满足设计要求。对二维计算结果进行校核,车站单双层的底板、顶板、侧板与中柱在施工过程中各个工况均满足设计要求。

With an introdction of the differentiation subsidence between mono-layer and double-deck metro stations, this paper adopts the Coulomb-Mohr yield and failure criterion by using 3D FEM numerical simulation method, applies the proposed modeling techniques of construction to simulate the project in the whole construction program of metro station. This research demonstrates the soil deformation mechanism of the ground settlement which is associated with the construction operation. This paper holds that the result is useful for the construction and the field measurement in complex soil conditions.