市政技术2026，Vol.44Issue(6)：283-289,298,8.DOI:10.19922/j.1009-7767.2026.06.283
软土深基坑非对称支护对邻近敏感结构变形的影响研究
Study on the Influence of Asymmetric Support of Deep Foundation Pit in Soft Soil on the Deformation of Adjacent Sensitive Structures
周婕 1谢宇1
作者信息
- 1. 中城交发工程咨询集团有限公司,浙江 杭州 310000||浙江省长三角基础设施科学研究院,浙江 杭州 310000
- 折叠
摘要
Abstract
To address the deformation control challenges of deep foundation pit adjacent to sensitive structures of bridges and pedestrian underpasses in soft soil areas,a combined support scheme of"asymmetric retaining structure+active servo control"was proposed and implemented based on a deep foundation pit project in Hangzhou.A 3D nu-merical model was established using the finite element software Plaxis 3D.The HSS model was employed to simulate the small-strain stiffness characteristics of the soft soil,and the entire construction sequence including excavation of Stage Ⅰ →backfill → excavation of Stage Ⅱ.The results indicate that the asymmetric retaining scheme of utilizing diaphragm walls with three supports of struts on the west side near the bridge and bored piles with three upports of struts on the remaining sides,combined with active axial force servo compensation,can precisely control over envi-ronmental deformation;The maximum horizontal displacement of the retaining structure is 7.5 mm,and the maxi-mum ground settlement outside the pit is 14.3 mm,exhibiting a narrow and deep settlement trough;Furthermore,the maximum horizontal and vertical displacements are 1.63 mm and-0.78 mm for the adjacent bridge pier,and the maximum horizontal and vertical displacements are 1.14 mm and-1.06 mm for the pedestrian underpass,respec-tively.All are well within the strict control limits(bridge≤ 3.0 mm,pedestrian underpass≤5.0 mm).The additional deformation of the retaining structure caused by Stage Ⅱ excavation is approximately 30％～40％of that by Stage Ⅰ,because that the partition piles effectively mitigate the superposition effects of staged construction on sensitive struc-tures.This scheme provides a valuable technical reference for similar deep foundation pit projects in complex and sensitive urban environments.关键词
软土深基坑/非对称围护结构/伺服主动控制/敏感构筑物/数值模拟Key words
deep foundation pit in soft soil/asymmetric retaining structure/active servo control/sensitive structures/numerical simulation分类
建筑与水利引用本文复制引用
周婕,谢宇..软土深基坑非对称支护对邻近敏感结构变形的影响研究[J].市政技术,2026,44(6):283-289,298,8.
