软土地区深基坑施工对邻近运营地铁隧道影响的实测分析

Measuring & Analysis of Influence to Adjacent Operating Subway Tunnel from Soft Soil Area Deep Foundation Pit Construction

以某沿海城市软土地区邻近营运地铁深基坑工程为实例,采用自动化监测方法对地铁隧道结构变形进行动态监测,分析基坑施工过程对其产生的影响。监测和分析结果表明:该地铁隧道在施工过程中发生了侧移、沉降、收敛等变形,基坑施工采取分块开挖、土体加固、抢筑底板等措施处治后隧道变形发展得到较好控制;隧道变形与基坑开挖卸荷、深层淤泥质土体流塑变形紧密相关。

This paper, taking deep foundation pit project adjacent to operating subway in soft soil area incertain coastal city as an example, uses automatic monitoring method to carry out dynamic monitoring ofthe structural deformation of subway tunnel, to analyze the influence by foundation pit construction. Themonitoring and analysis results show that the subway tunnel undergoes deformation such as side shift,settlement, restrain, etc. , during foundation pit construction, after taking treatment measures such asblock excavation, soil reinforcement, bed plate casting, etc. for foundation pit construction, the tunneldeformation was well controlled. The tunnel deformation is closely related with foundation pit excavation,plastic deformation of soil mass of deep layer sludge soil.