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国大.城市广场地处杭州市最繁华的商业中心武林广场地段,地下室五层,基坑开挖深度达28.0～32.0m,为目前浙江地区软土地基中最深的建筑基坑工程。基坑周边建筑物、地下构筑物、市政管线密集,场地内存在大量废弃的预制桩和钻孔灌注桩需处理,同时还需要提出将老地下室的一部分凿除后与新的五层地下室连接的多种工艺。详细介绍了五层地下室深基坑围护结构的设计思路,各种疑难问题的技术处理对策,并利用有限元分析计算了开挖过程中对相邻延安路下穿地铁盾构隧道的影响,可供类似工程设计参考。
National Plaza. City Plaza is located in Hangzhou City, the most prosperous commercial center Wulin Square, five basements, basement excavation depth of 28.0 ~ 32.0m, is currently the deepest foundation in Zhejiang soft soil foundation engineering. There are lots of abandoned prefabricated piles and bored piles in the site to deal with the buildings, underground structures and municipal pipelines around the foundation pit. At the same time, it is also necessary to put forward the proposal that some of the old basements should be excavated, Kind of craft The design method of deep foundation pit retaining structure in five basements and the technical treatment of various difficult problems are introduced in detail. The influence of adjacent subway tunnels under Yan’an Road is calculated by the finite element analysis. For similar engineering design reference.