流变地层地铁换乘站复合盖挖法施工力学分析  

Study on Mechanical Theory of Compound Cover Method for Metro Transfer Station in Rheological Stratum

作　　者：孔超[1] 陈书勇 张俊儒[1] 黄黆[1] 

机构地区：[1]西南交通大学土木工程学院,交通隧道工程教育部重点实验室,成都610031 [2]中交隧道工程局有限公司,北京100000

出　　处：《地下空间与工程学报》2014年第1期128-135,共8页Chinese Journal of Underground Space and Engineering

基　　金：中央高校基本科研业务专项资金资助项目(SWJTU11ZT33);铁道部科技发展计划项目(2001G009-2)

摘　　要：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。The subway station is usually located at the bustling downtown with heavy traffic flow, dense popula- tion, crowded building and municipal pipeline, and it is characterized by short construction period, etc. The metro station construction and structure stress characteristics are influenced by the rheo｜ogical property of soft soil stratum. Based on the three layers of underground park-and-ride station in Yuqiao Road, Shanghai, the new construction meth- od with composite covered excavation has been invented. The construction mechanics system of composite covered ex- cavation is studied using the finite difference software FLAC3D combined with field monitoring data, the calculation re- sults indicate that the maximum horizontal displacement of diaphragm wall is 15.6ram, relative displacement is 0.6%o H; The upper soil mass excavation of the foundation pit is the construction key point of compound cover method. To control excavating deformation, and reinforce the corresponding position and timely set support have important signifi- cance to reduce the deformation of foundation pit; the construction by composite covered excavation is good for the construction safety and surrounding environmental contrel.

关 键 词：地铁 换乘车站 复合盖挖法 流变地层 施工力学 

分 类 号：TU94[建筑科学—建筑技术科学]