紧邻地铁车站的深基坑位移控制措施效果分析

针对深基坑开挖时邻近地铁车站的保护问题,结合毗邻在建的宁波轨道交通2号线外滩大桥站绿地中心深基坑工程项目,通过Midas/GTS有限元软件对4种措施下邻近地铁车站位移控制的效果进行了对比分析。结果显示,增加围护墙刚度和采取坑内土体加固措施能有效减小基坑开挖导致的车站位移,增加支撑道数对车站位移控制同样有利,而增加围护墙嵌入深度的位移控制效果有限。

Effect Analysis of Displacement Control Measures for Deep Foundation Pit Adjacent to Subway Station

Combined with the case of Waitan Da Qiao Station close to the foundation pit of Ningbo Lvdi Centre project,the protection of subway station adjacent to deep excavation is discussed.With the aid of finite element analysis software Midas/GTS,the effects of 4 different measures on the displacement control are compared.The results show that the station displacement induced by excavation can effectively be reduced by increasing the stiffness of the retaining wall and reinforcing the soils in the pit,the increase of the support number is also beneficial to the displacement control of the station.However,the effect of increasing the embedded depth of the retaining wall is rather limited.