软土地区紧邻既有地铁车站深基坑施工安全技术

Construction Safety Technology of Deep Foundation Excavation Adjacent to Existing Subway Station in Soft Soil Area

基于上海某紧邻既有车站深基坑工程,分析了项目实施期间面临的主要挑战,包括高压线下方施作地下连续墙、既有车站保护及坑底突涌风险管控。此外,提出了低净空超深地下连续墙施工技术、紧邻既有车站基坑变形控制技术和复杂承压含水层抽水影响控制技术,有效确保了施工安全。

Based on a foundation excavation project close to one existing subway station in Shanghai,the major challenges faced throughout implementation of deep foundation excavation were analyzed,including implementation of underground diaphragm walls below high voltage lines,protection of the existing subway station,and risk control of hydraulic failures.Moreover,construction technology of ultra-deep underground diaphragm walls under low-net-clearance conditions,deformation-control technology of deep foundation excavation close to existing stations,and dewatering impact-control technology of complex confined aquifers were proposed,which effectively ensured the safety of project construction.