紧邻大坑工况下共用支护体系基坑止水和降水研究

The Research on the Water Stop and Precipitation in the Foundation Pit of the Sharing Supporting System in the closing big pit

能源中心基坑北侧为在建博物馆西馆工程,能源中心基坑边界与博物馆基坑连接,博物馆项目基坑深度为13.5 m,竖向结构采用三轴止水帷幕加灌注桩及局部采用地连墙,水平结构采用3道钢筋混凝土支撑。能源中心地下二层,钻孔灌注桩作为竖向结构,采用两道钢筋混凝土桁架支撑,北侧与博物馆基坑共用支撑体系,连接区域土方开挖将形成空腔造成地下水回灌,在连接区域通过高压旋喷桩的方法及连接处的东西两端进行加固止水,阻断两侧地下水流入空腔部位,为同类工程的实施提供借鉴。

On the north side of the foundation pit of the energy center is the West Museum Project under construction.The boundary of the foundation pit of the energy center is connected with the foundation pit of the museum.The depth of the foundation pit of the museum project is 13.5 m.The vertical structure adopts the three-axis water stop curtain plus cast-in-place pile and the local part adopts the diaphragm wall.The horizontal structure adopts three reinforced concrete supports.In the second underground floor of the energy center,as a vertical structure,bored piles are supported by two reinforced concrete trusses,and the north side shares the support system with the museum foundation pit.The earth excavation in the connection area will form a cavity and cause groundwater recharge.In the connection area,the method of high-pressure jet grouting pile and the East and West ends of the connection area are used to reinforce and stop the water flowing into the cavity on both sides.Provide reference for the implementation of similar projects.