软土地区盖挖逆作施工地铁换乘站变形性状的数值分析

摘要

基于三维快速拉格朗日算法原理，结合华东软土地区某盖挖逆作法施工换乘地铁车站工程实际并考虑基坑的周边环境因素，采用 FLAC3D数值模拟软件，对盖挖逆作法地铁结构开挖过程中的变形性状进行了数值分析，得到了基坑开挖各阶段的变形场，为地铁车站的设计和施工提供了较好的控制结构变形量的方案，以确保基坑开挖对周边环境的影响最小，并保证基坑安全施工。%Based on three dimensional fast Lagrangian algorithm,combined with an engi-neering practice,a top-down subway interchange station in the soft-clay region in east China was studied by considering the environment factors around of the foundation pit. Fast Lagrangian analysis of continua in 3 dimensions software (FLAC3D)was used to simulate the construction process,the structure deformation behaviors of the top-down subway interchange station were investigated using numerical analysis.Then the deform-ation fields were obtained in different stages of the excavation.All the results could pro-vide a better scheme for the structure design of subway station construction,which can control the structure deformation very well.The influence of excavation on the sur-rounding environment was minimized and the safety of foundation pit construction was ensured.