摘要
随着城市建设的发展,相邻深大基坑同期施工的情况愈发常见,然而其协同施工措施、同时开挖的相互影响及其对邻近既有地铁结构的耦合影响规律尚缺乏研究。以实际工程为背景,借助有限元方法,探究相邻深大基坑不同协同施工方案工况下围护结构变形的相互影响,以及对既有地铁结构的变形影响规律,为类似工程提供参考。研究表明,同期施工对基坑围护结构的影响主要体现在相邻方向上,且会大幅减小相邻侧墙体的变形;同期施工的相互影响效果应结合周围场地环境和基坑几何形状特点进行分析;采用不同的施工协调方案,在完工后两基坑围护结构的整体变形以及相邻既有地铁结构的变形差异很小;两基坑同期施工使既有地铁车站产生较大的水平变形,而竖向沉降较小;应考虑采取一定措施减小车站与隧道交接处的相对位移;两基坑同期施工对既有临近地铁结构的变形总体影响大致等于两基坑单独开挖时的影响效果的叠加。
With the development of urban construction,it is more and more common for adjacent deep and large foundation pits to be constructed at the same time.However,there is still a lack of research on the mutual influence of collaborative construction measures,simultaneous excavation and the coupling influence law on adjacent existing metro structures.This paper,based on the actual project,with the help of finite element method,Explores the mutual influence of the deformation of the retaining structure under different collaborative construction schemes of the adjacent deep and large foundation pits,as well as the deformation influence law of the existing metro structures,provide reference for similar projects.The research shows that the influence of simultaneous excavation on the retaining structure is mainly reflected in the adjacent direction,and the deformation of the adjacent side wall will be greatly reduced.The mutual effect of simultaneous excavation should be analyzed according to the surrounding site environment and the geometric shape of the foundation pit.The different construction coordination schemes of the two foundation pits have little influence on the overall deformation of the two pits and the adjacent existing metro structures.The simultaneous excavation of the two foundation pits results in large horizontal deformation and small vertical settlement of the existing metro station.Some measures should be taken to reduce the relative displacement at the junction of station and tunnel.The overall influence of the simultaneous construction of two pits on the deformation of the existing adjacent metro structure is roughly equal to the superposition of the influence of the two pits excavated separately.
作者
郭景琢
裴昊田
周强
贾建伟
袁杰
刘晓敏
高洁
程雪松
GUO Jingzhuo;PEI Haotian;ZHOU Qiang;JIA Jianwei;YUAN Jie;LIU Xiaomin;GAO Jie;CHENG Xuesong(China Construction Infrastructure Co.,Ltd.,Beijing 100044,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China;China Construction Sixth Engineering Bureau Co.,Ltd.,Tianjin 300457,China)
出处
《建筑结构》
北大核心
2023年第S01期2802-2808,共7页
Building Structure
基金
中建基础科技研发课题,CSCIC-2020-KT-(01)
中建股份科技研发计划资助(CSCEC-2020-Z-46)
关键词
相邻基坑
同步开挖
有限元分析
围护结构变形
既有地铁结构
adjacent excavations
simultaneous construction
finite element analysis
deformation of retaining structure
existing metro structure
