摘要
为探究基坑开挖过程中时空效应对深基坑围护墙变形的影响,以天津市某深基坑工程为背景,利用现场原位监测数据,分析深基坑围护墙顶水平位移、竖向位移及墙体深层位移变化的时间与空间效应。结果表明:基坑围护墙顶变形的80%是由中、下部土体开挖引起的,基础底板浇筑与支撑拆除对围护墙变形的影响较小;基坑围护墙顶水平位移要先于其竖向位移完成,二者在时间上存在较大的差异性;基坑角部的空间效应对围护墙水平位移的约束作用显著,而对围护墙竖向位移的约束作用很小;基坑不同方向围护墙水平位移在时间与空间上存在显著的差异,而竖向位移在时间与空间上的差异较小。该研究可为有效减小基坑围护结构的变形提供理论参考。
This paper is focused on a study designed to explore the influence of time-space effect on the deformation of retaining wall in deep foundation pit excavation.The study building on a deep foundation pit project in Tianjin analyzes the time and space effects of horizontal displacement,vertical displacement,and deep displacement of retaining wall in deep foundation pit using in-situ monitoring data.The results show that 80%of the deformation of the retaining wall of foundation pit results from the excavation of the middle and lower soil and is subjected to the little influence of the pouring of foundation slab and the support removal;the horizontal displacement of the top of the retaining wall of foundation pit should precede its vertical displacement,with a greater time difference observed between them;the spatial effect of the corner of foundation pit has a significant constraint on the horizontal displacement of retaining wall,but has a small constraint on the vertical displacement of retaining wall;significant differences exist in time and space between horizontal displacement in different directions of foundation pit but smaller differences occur in vertical displacement of retaining wall.The research could provide a theoretical reference for effectively reducing the deformation of foundation pit retaining structure.
作者
赵延林
丁志刚
张玉
吴昊
Zhao Yanlin;Ding Zhigang;Zhang Yu;Wu Hao(School of Architecture & Civil Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China)
出处
《黑龙江科技大学学报》
CAS
2020年第5期566-571,共6页
Journal of Heilongjiang University of Science And Technology
关键词
深基坑
时空效应
围护墙
环形内支撑
deep foundation pit
time-space effect
retaining wall
ring support
