摘要
以福州地铁祥坂站基坑和苏宁B11基坑共用地下连续墙为研究对象,采用弹性法开展了理论计算并基于现场实测数据系统分析了基坑非同步开挖全过程中共用地下连续墙的侧向变形、支撑轴力、墙顶与立柱隆沉等的变化规律。研究结果表明:共用地下连续墙的最大水平侧向变形随着开挖深度的增加而逐渐增大,并表现为一定的空间效应;共用地下连续墙上混凝土支撑轴力的变化与土层侧向变形基本同步,随着基坑开挖深度的增加而逐步增加,并在底板浇筑完成后最终趋于稳定。共用地下连续墙顶部在基坑开挖初始阶段发生一定的沉降变形,而后随着开挖的持续,坑底土的回弹隆起则致使共用地下连续墙快速发生隆起。总体而言,该紧邻深基坑围护结构中的共用地下连续墙能满足工程要求,联合三道混凝土内支撑可较出色地控制基坑侧向位移的发展。研究成果可为类似共用地下连续墙相邻基坑工程的设计与施工提供指导和参考。
The foundation pit of the Xiangban station of Fuzhou subway and the foundation pit of Suning B11 are taken as the research object, the laws of lateral deformation, supporting axial force, wall top and column uplift are analyzed during the whole process of non-synchronous excavation based on the field measured data. The research results show that the maximum horizontal lateral deformation of the shared diaphragm wall gradually increases with the increase of the excavation depth, and shows a certain spatial effect;the change of the axial force of the concrete support on the shared diaphragm wall is related to the lateral deformation of the soil layer, gradually increasing with the increase of the excavation depth of the foundation pit, and finally stabilizes after the bottom plate is poured. The top of the shared diaphragm wall undergoes a certain settlement and deformation at the initial stage of the excavation, and then as the excavation continues, the rebound and uplift of the pit bottom soil causes the shared diaphragm wall to quickly uplift. In general, the shared underground continuous wall in the adjacent deep foundation pit enclosure can meet the engineering requirements, and the combination of three concrete internal supports can better control the development of the lateral displacement of the foundation pit. The research results can provide guidance and reference for the design and construction of adjacent foundation pit projects of similar shared diaphragm walls.
作者
俞强
Yu Qiang(Fujian Provincial Institute of Architectural Design and Research Co.Ltd,Fuzhou 350001,China)
出处
《建筑科学》
CSCD
北大核心
2022年第3期129-138,共10页
Building Science
基金
福建省科技计划引导性项目(2021H01010159)。
关键词
深基坑
共用地下连续墙
变形特性
实测分析
空间效应
deep foundation pit
shared diaphragm wall
deformation characteristic
field analysis
spatial effect
