车站一体化群洞临近设计施工方案优化及应用

Optimization and application of the design and construction plan for the integration of subway station group tunnels adjacency

以北京轨道交通7号线东延工程中万盛南街西口站南侧一体化结构多个暗挖通道工程为背景,针对多个暗挖通道上下、左右相距很近甚至连体施工时,因地下水处理不到位、施工顺序(方法)及进洞方式控制不当引起地层沉降叠值超标,甚至导致穿越市政管线断裂、已完通道结构开裂及道路坍塌等问题,结合地质水文、相互位置关系及现场实际情况优化设计施工方案,并在现场应用,经验证该方案安全可控、节省工期、经济环保。

Taking the integrated structure of multiple underground excavation channels on the south side of Wansheng South Street Xikou Station in the East Extension Project of Beijing Rail Transit Line 7 as the background,this study aims to address the problems of inadequate groundwater treatment,improper construction sequence(method),and tunnel entry control during the construction of multiple underground excavation channels,which may result in excessive ground settlement,even leading to the fracture of municipal pipelines,cracking of completed channel structures,and road collapse,Optimize the design and construction plan based on geological and hydrological conditions,mutual location relationships,and actual on-site conditions,and apply it on site to verify its safety,controllability,time saving,and economic and environmental protection.