地铁浅覆土大断面矩形顶管施工沉降控制分析

Analysis on Settlement Control of Large Section Rectangular Pipe Jacking Construction in Subway Shallow Overburden Soil

文章以南京地铁S8号线大桥站1号出入口顶管施工为例,结合南京长江漫滩工程水文地质、出入口设计,顶管施工及监测情况,介绍了在浅覆土顶管施工情况下采取的地面沉降控制措施,通过始发、正常顶进和接收阶段的正面土压力控制,以及后续泥浆置换的控制措施,有效避免了大桥下匝道区域的地面沉降问题。

Taking the pipe jacking construction at No.1 entrance and exit of Daqiao Station on Nanjing Metro Line S8 as an example,combined with the hydrogeology,entrance and exit design,pipe jacking construction and monitoring situation of Nanjing Yangtze River floodplain project,this paper introduces the ground settlement control measures taken in the case of pipe jacking construction in shallow overburden soil.Through the control of front soil pressure in the starting,normal jacking and receiving stages,as well as the subsequent control measures of mud replacement,the ground settlement problem in the lower ramp area of the bridge is effectively avoided.