基坑开挖施工对邻近地铁隧道结构的影响研究

Research on the Influence of Foundation Pit Excavation Construction on the Adjacent Subway Tunnel Structure

随着城市建设步伐的加快,越来越多的建(构)筑物施工会对已建成的地铁结构造成影响。为了研究新建明挖基坑施工对邻近既有地铁区间的影响,以福州市世茂帝封江A地块项目基坑施工临近福州地铁5号线成型隧道为背景,论文利用有限元计算软件建立基坑与相邻地铁隧道的三维数值模型,模拟建筑基坑开挖卸载过程,得到基坑施工对既有地铁区间隧道的影响。研究结果表明,基坑采用SMW工法桩+三轴搅拌桩止水帷幕的基坑支护方案,基坑开挖施工对地铁隧道结构的影响可控,能够达到满足地铁隧道保护的目的。

With the acceleration of the pace of urban construction,more and more construction(structures)will affect the completed subway structure.In order to study the influence of new open pit construction on adjacent existing metro area,taking the foundation pit construction of Fuzhou Shimaodi Fengjiang Plot A project near the formed tunnel of Fuzhou metro line 5 as the background,this paper establishes the three-dimensional numerical model of foundation pit and adjacent subway tunnel by using finite element calculation software,and simulates the unloading process of building foundation pit,and the influence of foundation pit construction on the existing subway tunnel is obtained.The research results show that the foundation pit supporting scheme of SMW method pile+three-axis mixing pile sealing curtain can control the influence of foundation pit excavation on the structure of subway tunnel,and can meet the purpose of subway tunnel protection.