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地铁车站多位于繁华闹市区,具有交通流量大、人口居住密集、周围建筑物、市政管线密集、工期短等特点,在沿海地区修建地铁车站时还会遇到具有流变特性的软土地层,地层的流变特性会严重影响车站结构受力和施工安全。以上海市轨道交通御桥路地下三层换乘车站为工程依托,提出了复合盖挖新型施工方法,应用FLAC3D差分软件并结合现场监测数据对复合盖挖法施工力学行为进行了详细分析,得出利用复合盖挖法连续墙的最大水平位移为15.6 mm,相对位移仅为0.6‰H;基坑上部土体开挖为复合盖挖法施工关键工序,在上部开挖时,有效控制基坑变形并进行相应加固、及时设置支撑等对减小基坑的整体变形有着重要意义;复合盖挖法的施工对施工安全和周边环境控制是有利的。
Metro stations are located in downtown area with traffic flow, population density, surrounding buildings, municipal pipeline intensive, short duration and other characteristics of the construction of the Metro station in the coastal area will encounter the soft soil strata with rheological properties, The rheological properties of the strata can seriously affect the stress of the station structure and construction safety. Based on the three-floor transfer station of Yuqiao Road in Shanghai Metro, a new construction method of compound cover excavation is put forward, and the construction mechanics behavior of composite cover excavation method is analyzed in detail by using FLAC3D differential software combined with on-site monitoring data The maximum horizontal displacement of the continuous wall with composite cap excavation method is 15.6 mm and the relative displacement is only 0.6 ‰ H. The excavation of the upper soil of the foundation pit is the key process for the construction of the compound cap excavation method and effectively controls the excavation of the foundation pit Deformation and the corresponding reinforcement, timely set up support and so on to reduce the overall deformation of the foundation pit is of great significance; composite cover excavation construction of the construction safety and the surrounding environment control is beneficial.