软土地区既有地铁车站地下结构改造研究

基于天津地铁既有地铁车站结构改造工程，对大型地铁车站地下结构的改造方案进行研究。提出沿车站长度方向隔跨跳仓改造、沿深度方向自上而下分层改造的方案。在地下车站结构改造过程中，采用三维数值模拟分析既有地下车站结构、新设置的地下连续墙的内力与变形，在此基础上对改造方案进行了优化。改造工程实施效果良好，实测的变形与数值模拟吻合较好。

Research of existing metro station structure reconstruction in soft soil ground

Based on an existing metro station structure reconstruction project, large underground structure reconstruction method is analyzed. The method to widen the existing metro station and to construct the new structure was presented. Three dimensional finite element simulations were performed to predict the stress and deformation of existing structure and the reconstruction scheme was optimized based on the numerical simulation. Field observation and measurement show that the deformation of existing structure remain safe and the deformation yielded during reconstruction match quite well with the predicted value.