地铁车站基坑开挖对周边建构筑物影响研究

Influence of Subway Foundation Excavation on Adjacent Buildings and Structures

地铁车站建设越来越密集,与建筑物较近的地铁车站深基坑变形研究显得越来越重要。以南昌市某地铁车站深基坑工程为依托,对比分析理正深基坑计算软件与PLAXIS有限元软件采用HS本构模型时的计算结果,表明有限元数值分析采用HS模型时比较贴合基坑开挖工程实际;比较钻孔灌注桩与混凝土墙做基坑与建构筑物之间隔离墙的计算结果,得出建构筑物临近地铁车站时地铁车站基坑设计要点,为后续临近建构筑物地铁车站基坑设计提供参考。

The subway stations are usually located at the densely populated urban area with closely spaced buildings and other structures. As a result, deformation of the supporting structures for the station foundation excavation on the adjacent buildings and structures becomes more and more practically important. This paper presents a case history of subway station foundation excavation in Nanchang City. The deformation of the supporting structure was comparatively evaluated by analytical method using Lizheng software and numerical analysis using PLAXIS finite element method with Hardening Soil(HS) constitutive model. The results indicate that the numerical analysis using HS soil model resulted in closer deformations with the monitoring data. The deformation isolation walls constructed by cast-in-situ reinforced concrete piles and slurry wall between the excavated area and the adjacent buildings and structures were compared. This paper also summarized main aspects of deep excavation near building structures.