摘要
Abstract
Excavation of the foundation pit will cause displacement of the surrounding soil,resulting in additional deformation of the surrounding soil.When the buildings around the foundation pit need to be protected,and there are special requirements for the site displacement,strict standards for the control of foundation pit deformation must be formulated.In this paper,the relevant research results on the law of soil deformation caused by foundation pit excavation are sorted out and combined with the relevant specifications.Considering the protection requirements of independent foundations,the foundation pit deformation control standard is established through the back analysis method,and the influencing factors of the allowable value of foundation pit deformation are analyzed.The results show that:with the increase of excavation depth,the allowable value of foundation pit deformation decreases first and then increases,approximately showing a parabolic distribution;when the depth of independent foundation exceeds 0.3 times the excavation depth of the foundation pit,the allowable deformation value of the foundation pit remains unchanged;with the increase of the distance from the central axis of the foundation pit offset,the allowable deformation of the foundation pit increases monotonically,however,within the range of 0.3 times the length of the foundation pit,it basically remains unchanged,and then increases rapidly.关键词
基坑变形标准/基坑开挖/建筑保护/土体位移Key words
foundation pit deformation standard/foundation pit excavation/building protection/soil displacement
