基坑开挖对邻近地铁车站变形的影响分析

Impact Analysis of Foundation Pit Excavation on Deformation of Metro Station Nearby

基于深圳宝安区某邻近地铁车站基坑工程,对基坑施工全过程进行数值模拟,分析基坑开挖对邻近地铁车站结构产生的变形影响。结果表明:基坑支护结构变形随着开挖深度增加而增加,地铁车站结构水平变形(朝坑内)从东向西逐步增大、从地铁顶板到底板方向逐步减小,最大水平变形发生在地铁车站附属一号风井结构西端顶部;地铁车站结构竖向变形(向上)从东向西逐步增大,最大竖向变形发生在地铁车站附属一号风井结构底板中部。

Based on the foundation pit engineering adjacent to a metro station in Baoan District,Shengzhen,numerical simulation was carried out on the entire construction process so as to analyze the impact of foundation pit excavation on the structural deformation of metro station nearby.The result shows that,the deformation of the supporting structure for foundation pit is increased with the increase of the excavation depth;the horizontal deformation(towards to the pit)of the metro station structure increases gradually from the east to the west,decreases gradually from the roof to the floor,and the maximum horizontal deformation occurs at the top of the west end of No.1 air shaft structure affiliated to the metro station;the vertical deformation(upward)of the metro station structure increases gradually from the east to the west,and the maximum vertical deformation occurs in the middle of the floor of No.1 air shaft structure affiliated to the metro station.