复合地层超深基坑开挖对邻近地铁车站的影响研究  

Research on the Influence of Ultra-deep Foundation Pit Excavation in Composite Stratum on Adjacent Subway Stations

作　　者：周博 ZHOU Bo(Chengdu Railway Construction Management Co.,Ltd.,Chengdu 610000,Sichuan,China)

机构地区：[1]成都轨道建设管理有限公司,四川成都610000

出　　处：《工程技术研究》2023年第12期203-205,共3页Engineering and Technological Research

摘　　要：复合地层超深基坑动态开挖过程中,新建超深基坑施工会对既有车站产生一定的影响,导致既有车站结构变形或沉降,甚至影响结构安全,使其无法正常运营,因此,有必要研究复合地层超深基坑动态开挖。文章以成都轨道交通18号线某车站基坑为工程背景,基于复合地层深基坑在不同施工环境中开挖,从基坑—土体—既有车站的传力机制角度分析工程扰动引起围护结构变形及地表沉降。研究表明,相比自由场深基坑动态开挖,近接既有车站施工时围护结构桩体侧同比增长38.17%,地表沉降同比增加38.23%,既有车站差异沉降达4.67 mm。鉴于两车站间距的特殊性,后期施工过程中应采取针对性措施,减少新建基坑对既有车站的影响。In the process of dynamic excavation of ultradeep foundation pit in composite stratum,the construction of newly built ultra-deep foundation pit will have a certain influence on the existing station,which will lead to the deformation or settlement of the existing station structure,and even affect the safety of the structure,making it unable to operate normally.Therefore,it is necessary to study the dynamic excavation of ultra-deep foundation pit in composite stratum.Taking the foundation pit of a station on Chengdu Rail Transit Line 18 as the engineering background,based on the excavation of deep foundation pit in composite stratum in different construction environments,this paper analyzes the deformation of retaining structure and surface settlement caused by engineering disturbance from the perspective of force transmission mechanism of foundation pit-soil-existing station.The research shows that compared with the dynamic excavation of the deep foundation pit in the free field,the pile side of the retaining structure increases by 38.17% year-on-year during construction near existing stations,the surface settlement increases by 38.23% year-on-year,and the differential settlement of the existing station reaches 4.67 mm.In view of the particularity of the distance between the two stations,targeted measures should be taken in the later construction process to reduce the influence of the newly built foundation pit on the existing station.

关 键 词：复合地层 超深基坑 既有车站 数值模拟 

分 类 号：U231.3[交通运输工程—道路与铁道工程]