上跨既有地铁隧道的明挖基坑施工关键技术

Key Technology of Open Excavated Foundation Pit Construction for Overcrossing Existing Metro Tunnel

上海徐家汇中心虹桥路地块4-15区基坑施工大部分在运营的地铁隧道上方进行,由于其地理位置特殊,底板下有轨道交通9号线穿过,所以施工难度较大。通过采取一系列施工技术,解决了基坑开挖卸载后可能造成地铁隧道上浮所引起的变形问题,顺利完成了4-15区的基坑开挖施工。

Most of the foundation pit construction in zone 4-15 of Hongqiao Road plot in Xujiahui center,Shanghai is carried out above the operating subway tunnel.Due to its special geographical location,rail transit line 9 passes under the floor,so the construction is difficult.By adopting a series of construction technologies,the deformation problem caused by the floating of metro tunnel after foundation pit excavation and unloading is solved,and the foundation pit excavation construction in zone 4-15 is successfully completed.