摘要
为了分析基坑开挖对邻近地铁隧道纵向变形的影响,首先采用Mindlin解推导得到基坑开挖引起的隧道纵向附加应力计算公式;然后基于双面弹性地基梁模型建立地铁隧道的纵向变形方程,并应用有限差分法和MATLAB编程计算出隧道的纵向位移;最后通过有限元算例和工程实例对理论方法的合理性进行验证。结果表明:提出的理论计算方法与数值模拟结果和现场实测值均吻合良好;采用双面弹性地基梁模型分析隧道纵向变形比Winkler弹性地基梁模型更具优越性。
In order to analyze the influence of foundation pit excavation on the longitudinal deformation of adjacent metro tunnel,Mindlin solution was used to drive formulas of the tunnel longitudinal additional stress caused by foundation pit excavation, longitudinal deformation equation of metro tunnel was established based on two-sided elastic foundation beam model,the longitudinal displacement of tunnel was calculated by finite difference method and MATLAB programming,and the rationality of the theoretical method was verified by finite element analysis and engineering examples.The results show that the proposed theoretical calculation method is in good agreement with the numerical simulation results and field measured values,a nd analysis of tunnel longitudinal deformation with twosided elastic foundation beam model is superior to that with Winkler elastic foundation beam model.
作者
徐闻达
蒋军
XU Wenda;JIANG Jun(Institute of Disaster Prevention Engineering,Zhejiang University,Hangzhou Zhejiang 310058,China)
出处
《铁道建筑》
北大核心
2018年第9期63-67,共5页
Railway Engineering
基金
国家自然科学基金(51078329)
关键词
地铁隧道
计算公式
理论分析
纵向变形
基坑开挖
Metro tunnel
Calculation formula
Theoretical analysis
Longitudinal deformation
Foundation pitexcavadon
