摘要
以临近地铁车站及地铁隧道的某深大综合体基坑项目为背景,分析基坑开挖对于地铁车站结构及地铁隧道结构产生不良影响的因素。基坑围护结构采用地下连续墙结合多道钢筋混凝土内支撑支护,通过三维有限元数值模拟方法分析多种不同的基坑开挖方案对于地铁结构的影响,结果表明减小基坑的开挖深度,对基坑采取分坑措施减小基坑的一次性开挖面积,对基坑与地铁结构之间土体进行加固,合理安排开挖顺序等方式可以有效的减小基坑开挖对于地铁结构的变形影响。通过实施方案的有限元模拟结果与现场实测数据进行对比,有限元结果与实测数据趋势与数值接近,验证了有限元模拟结果可靠性,说明小应变土体本构模型能构较好地模拟复杂环境下基坑开挖对周边地下重要构筑物的影响。
Based on the foundation pit project of a deep complex adjacent to subway station and subway tunnel,this paper analyzes the factors that cause adverse effects of foundation pit excavation on subway station structure and subway tunnel structure.Foundation pit retaining structure by the combined multichannel underground continuous wall of reinforced concrete brace support,by three-dimensional finite element numerical simulation methods to analyze a variety of different excavation schemes for the influence of the subway structure,the results show that reduce the foundation pit excavation depth,for once in points and measures to reduce the foundation pit excavation area,to reinforce the foundation pit and underground structure between the soil,Reasonable arrangement of excavation sequence can effectively reduce the influence of foundation pit excavation on the deformation of subway structure.The finite element simulation results of the implementation scheme are compared with the field measured data,and the trend and value of the finite element simulation results are close to the measured data,which verifies the reliability of the finite element simulation results,indicating that the small strain soil constitutive model can better simulate the influence of foundation pit excavation on the surrounding underground important structures in a complex environment.
作者
张向军
叶冬明
郭健宝
胡生云
俞波
ZHANG Xiangjun;YE Dongming;GUO Jianbao;HU Shengyun;YU Bo(Lanlvshuangcheng Technology Group Co.,Ltd.,Hangzhou 310012,China;Hangzhou Metro Development Co.,Ltd.,Hangzhou 310016,China;Zhejiang Zhongnan Construction Group Co.,Ltd.,Hangzhou 310051,China;Hongrun Construction Group Co.,Ltd.,Hangzhou 315700,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S01期2508-2512,共5页
Building Structure
基金
浙江省建设科研项目(2021K006)
关键词
基坑开挖
分坑措施
变形控制
有限元模拟
excavation of foundation pit
measures to divide pit
deformation control
finite element simulation
