浅埋大跨度变截面隧道地层沉降规律及控制技术

On the stratum settlement and controlling measures of long span changing section shallow metro tunnel construction

依托深圳地铁7号线变截面施工区段工程实例,采用数值模拟方法,研究了浅埋大跨度变截面隧道施工地层沉降规律,结果表明,地层分界处对开挖所造成的应力分布有比较大的影响,表现为分界处的应力相对较小;变截面隧道开挖应力集中区域主要在两侧拱腰部位以及变截面处,最后提出了变截面隧道施工控制技术。

Taking the changing section of Shenzhen subway line 7,numerical simulatiion method,the stratum settlement law of the shallow buried large-span tunnel with variable cross section is studied. The result shows,the excavation of formation interfaces has a great effect on the stress distribution,the stress on the formation interface is smaller. The focal point of stress on changing section tunnel are mainly located on the haunch and the section. Finally proposed the variable cross-section tunnel construction control technology.