某地铁明挖深基坑施工中变形监测技术应用

Application of deformation monitoring technology in open pit deep excavation of a subway

地铁车站施工一般位于城市的中心区,采用的施工方法主要有两种:即明挖法和暗挖法。尤其在地铁明挖深基坑工程的施工期会产生基坑围护结构的位移、坑底不平衡隆起、周边地表不稳定沉降等变形,如若有过大的变形值则会引起基坑失稳或周边建(构)筑物开裂等工程事故。本文以石家庄新客站东广场二、三号线节点明挖深基坑工程为背景,介绍在深基坑施工中变形监测的必要性、监测方法及监测的意义。

Metro station construction is generally located in the central area of the city, and the construction methods adopted are mainly two kinds: open cut method and underground excavation method. Especially in the construction period of metro station deep excavation will cause displacement of retaining structure, unbalanced bottom uplift, unstable settlement of surrounding ground surface deformation, if there is excessive deformation will cause instability of foundation pit surrounding buildings or buildings(structures) cracking of engineering accidents. In the background of Eastern square of Shijiazhuang new station line two、three's deep excavation project with node open cut, the necessity of deformation monitoring in deep foundation construction, monitoring method and significance.