软土地区深基坑承压水降水对地表沉降影响分析  

Influence of Confined Water Dewatering on Surface Settlement of Deep Foundation Pit in Soft Soil Area

作　　者：林宣 徐海涛 高旭 仲洋洋 张金凯 董毓庆 LIN Xuan;XU Haitao;GAO Xu;ZHONG Yangyang;ZHANG Jinkai;DONG Yuqing(Hangzhou Metro Group Co.Ltd.,Hangzhou Zhejiang 310000,China;China Railway 19Lh Bureau Group Co.Ltd.,Beijing 100176,China;China Railway Construction Bridge Engineering Bureau Group Co.Ltd.,Tianjin 300300,China;Department of Civil Engineering,Zhejiang Lniversity City College,Hangzhou Zhejiang 310015,China)

机构地区：[1]杭州地铁集团有限责任公司,浙江杭州10000 [2]中铁十九局集团有限公司,北京100176 [3]中国铁建大桥工程局集团有限公司,天津300300 [4]浙大城市学院土木工程系,浙江杭州310015

出　　处：《铁道建筑技术》2022年第4期156-160,165,共6页Railway Construction Technology

基　　金：杭州市科技计划项目(2020010);浙江省科技计划项目(2020K007)。

摘　　要：杭州地铁8号线青六路站深基坑工程赋存地下承压水,为确保基坑工程顺利实施,基坑开挖施工期间采取降水措施,并对基坑及周边环境进行全面监测。通过分析监测数据得出结论:基坑周边地表沉降呈明显阶段性,分别为浅层开挖阶段(0~-8 m)、承压水降水阶段、深层土体开挖阶段(-8~-24 m)、整体底板构筑阶段;由于坑外水位恢复,基坑出现明显回弹现象,最大回弹量为47.3 mm;基坑围护结构变形增加主要集中于基坑深层土体开挖阶段;基坑特殊的三角区结构产生了较为明显的空间效应,导致基坑北侧地表沉降略大于南侧。The underground confined water is found in deep foundation pit engineering of Qingliu Road Station of Hangzhou Metro Line 8.In order to ensure the smooth implementation of foundation pit engineering,precipitation measures are taken during the excavation,and the comprehensively monitoring is carried on the foundation pit and its surrounding environment.Through the analysis of monitoring data,the conclusions are drawn as follows:the ground settlement around the foundation pit shows obvious stages,including shallow excavation stage(0~-8 m),confined water precipitation stage,deep soil excavation stage(-8~-24 m),and construction stage of the overall bottom plate;due to the recovery of the water level outside the pit,the pit has an obvious springback phenomenon,and the maximum springback is 47.3 mm.The deformation of foundation pit retaining structure mainly increases during the excavation stage of deep soil.The special triangular structure of the foundation pit produces an obvious spatial effect,which leads to the surface settlement of the north side of the foundation pit is slightly larger than that of the south side.

关 键 词：深基坑 承压水 降水 变形监测 地表沉降 

分 类 号：TU473.3[建筑科学—结构工程]