摘要
结合上海某基坑工程的工况和地质参数,建立数值计算模型,分析软土地区大面积基坑分区开挖对邻近地铁车站底板变形的影响,优化基坑开挖方式。计算结果表明:合理的分区开挖方式可以显著减小基坑开挖对邻近地铁车站底板变形的影响;与未分区开挖相比,分区以后先开挖离车站较远的大面积基坑、后开挖离车站较近的小面积基坑时,车站底板竖向位移和水平位移比不分区时分别减小43%和38%;分区后未开挖部分土体和地下连续墙对基坑变形的遮拦作用以及时空效应可以充分发挥作用。
Combined with the site conditions and geological parameters of a deep excavation in Shanghai,numerical models are employed to analyze the impacts of the large-scale excavation with the zoned excavation on the vicinity metro station in soft soil, and the excavation modes are optimized. The calculation results show that the reasonable zoned excavation can obviously reduce the impacts of the excavation on nearby metro station. Compared with the non-zoned excavation,for the earlier excavation with the farther large area foundation pit then the excavation with the small area pit near the station,the vertical and horizontal displacements of the station floor have reduced by 43% and 38% respectively. The blocking effect of the non-excavation soil and the diaphragm wall,as well as the time-space effect,play the important roles on deformation control.
作者
王树银
Wang Shuying(Fourth Highway Engineering Bureau Co.,Ltd.,CCCCy Beijing 100022,China)
出处
《工程勘察》
2021年第6期14-18,共5页
Geotechnical Investigation & Surveying
基金
西安市建委城建专项资金支持项目(SJW2017-13)
中央高校基本科研项目费资助(300102289303)。
关键词
基坑
车站
地铁
软土
deep excavation
station
metro
soft clay
