某软土地区地铁车站坑中坑的围护结构选型

Selection of Retaining Structure of Pits-in-pits in Subway Station in A Soft-soil Area

介绍某软土地区与地块结合的某地铁车站坑中坑围护结构设计方案,进行了围护结构方案比选、结构受力及基坑变形分析,再通过监测数据验证。坑中坑采用钻孔灌注桩+止水帷幕+一道钢支撑的围护体系,极大地缩短了工期,为类似地质条件以及周边环境条件下的同类型基坑围护设计提供借鉴。

This paper introduces the design scheme of a pits-in-pits envelope structure for a subway station in a soft-soil area combined with a plot.The envelope structure scheme comparison,structural stress and foundation pit deformation analysis are carried out,and then verified by monitoring data.The pits-in-pits uses a bored cast-in-situ pile+water-proof curtain+a steel-supported enclosure system,which greatly shortens the construction period in order to provide reference for similar foundation pit enclosure designs under similar geological conditions and surrounding environmental conditions.