换乘车站深基坑开挖对既有地铁车站的变形控制及影响

Deformation Control and Influence of Deep Foundation Pit Excavation on Existing Metro Station at Transfer Station

本文以合肥市地铁某换乘车站基坑施工对已运地铁车站结构影响为项目背景,基于有限元分析软件MIDAS-GTS/NX对项目基坑施工进行全过程模拟,模拟包括车站基坑开挖、车站及附属结构回筑、侧墙破除等内容。模拟计算结构表明:既有车站主体及附属结构、区间结构水平位移、竖向位移均低于控制值5 mm,满足规范要求。因此可以看出既有地铁结构在拟建地铁车站结构施工过程中可以保障安全运营。

Based on the influence of foundation pit construction on the existing subway station structure in a transfer station in Hefei,the whole process of foundation pit construction is simulated based on the finite element analysis software MIDAS-GTS/NX,including foundation pit excavation,station and auxiliary structure reconstruction,side wall demolition and so on.The simulation results show that the horizontal and vertical displacement of the existing main body and auxiliary structure of the station and the section structure are all lower than the control value of 5 mm,meeting the requirements of the specification.Therefore,it can be seen that the existing subway structure can ensure safe operation in the construction process of the proposed subway station structure.