摘要
研究目的:随着城市的不断发展,城市内地铁线路的建设越来越多,不可避免地会有大量基坑建设紧邻已建或在建的地铁车站或区间隧道,地铁深基坑的开挖工程对周边已有地铁建筑的相互影响也日益突出。本文以苏州轨道交通1号线星海街站为例,通过对车站两侧基坑的两种不同开挖工况进行数值计算,分析基坑对称开挖与非对称开挖对已有轨道交通的变形影响,拟获取不同开挖方式工况下对既有地铁车站结构变形影响的基本规律。研究结论:(1)基坑开挖对地铁车站结构变形的影响主要体现在垂直地铁轴线方向的变形及竖向沉降;(2)相对于非对称开挖,基坑对称开挖对地铁车站结构的变形影响较小;(3)从对地铁车站结构变形影响最小化的角度来看,当具备对称开挖基坑条件时,建议采取两侧基坑同时开挖的方法;(4)本研究成果可为今后地铁安全评估提供参考。
Research purposes: With the continuous development of the urban, the demand for urban subway construction is increasing,and more and more subway lines are built in the city. Inevitably,a large number of foundation pits will be built next to the subway stations or section tunnels that have been built or under construction. The excavation of the deep foundation pit of the subway has become increasingly prominent in the existing subway construction. This paper takes the Xinghai Street Station of Suzhou Rail Transit Line 1 as an example,two different excavation conditions of the foundation pits on both sides of the subway station were modeled in numerical simulation.The influence of symmetric excavation and asymmetric excavation methods on the deformation of the existing rail transit construction was compared. And the basic law of the influence of different excavation methods on the deformation of existing rail transit construction is aimed to be obtained.Research conclusions:( 1) The influence of foundation pit excavation on the structural deformation of metro station is mainly reflected in the deformation and vertical settlement of the vertical subway axis.( 2) Compared with the asymmetric excavation,the symmetrical excavation of the foundation pit has smaller effect on the deformation of the metro station structure.( 3) From the perspective of minimizing the influence of structural deformation of the subway station,when symmetrical foundation pit excavation is proposed,it is recommended to adopt the method of simultaneous excavation of the foundation pits on both sides.( 4) The research result can provide reference for the safety assessment of subway in the future.
作者
江智鹏
JIANG Zhipeng(China Railway Siyuan Survey and Design Group Co. Ltd,Wuhan,Hubei 430063 ,China)
出处
《铁道工程学报》
EI
北大核心
2019年第6期86-90,共5页
Journal of Railway Engineering Society
关键词
对称基坑
基坑开挖
轨道交通
结构变形
symmetrical foundation pit
foundation pit excavation
rail transit
construction deformation
