复杂条件下软土超深基坑变形特性分析

Analysis of Deformation Characteristics of Super Deep Pit Excavation in Soft Soil Under Complex Conditions

以古河道沉积软土区某市域线车站基坑为案例,针对(6)层粉质黏土缺失、多分区、基坑临边重车荷载大等特点,分析不同基坑宽度、不同围护深度、进出洞加固区、换乘段等区域围护墙体测斜变形规律,并总结基坑不同分区的坑外地表沉降变形规律。根据围护墙体测斜数据和地表沉降数据规律,对相关施工控制措施进行了探讨,为后续类似项目提供经验借鉴。

Taking the foundation pit of a city station in an ancient river sedimentation soft soil area as a case study,the deform-ation law of the retaining wall was analyzed in areas such as different foundation pit widths,different retaining depths,reinforcement areas for entrance and exit tunnels,and transfer sections based on the characteristics of missing⑥layer of silty clay,multiple zones,and heavy vehicle loads on the edge of the foundation pit.The laws of surface settlement and deformation outside the pit were summar-ized in different zones of the foundation pit.Based on the inclination measurement data of the retaining wall and the law of surface set-tlement data,relevant construction control measures were discussed,providing experience and reference for similar projects in the fu-ture.