既有地铁车站两侧基坑施工对车站结构变形影响分析

本文以南京某建成地铁车站两侧基坑工程为背景，利用有限元数值模拟计算方法首先分析了两侧基坑不同开挖方案下对已建成地铁车站的影响。计算结果表明：两侧基坑开挖方案按照施工方案3实施，对车站结构的影响最小，方案最优。若按照施工方案2、3进行施工车站结构最后的变形朝向先施工基坑侧。然后通过实际施工方案1和现场监测数据对比，结果表明数值计算结果和实测值差别不大，变化趋势具有一致性，满足工程需求。

Analysis of influence on existing metro station structure in the foundation pit construction on both sides of the subway station

Base on the subway station built on both sides of excavation engineering In Nanjing, First make us of the finite element method to Numerical simulation, Analysis of different construction scheme on both sides of the excavation of structural deformation influence in Existing subway station. The results show that both sides of the excavation program implemented in accordance with the construction plan 3 which is influence on subway Station structure at least, Construction organization plan is the best. If in accordance with the construction program 2or 3, The last station structure deformation toward the first construction pit side. Then through the practical construction scheme 1 and field monitoring data comparison, the numerical results and the measured value is nearly same change trend is consistent, meet the requirements of engineering.