重庆地铁单拱大跨断面设计研究与分析

Research and analysis on single-arched span section design for Chongqing subways

利用Midas-GTS分析软件,对重庆地铁单拱大跨断面进行有限元模拟,得出定性的评价,对二次衬砌按概率极限状态设计法进行承载能力极限状态及正常使用极限状态的验算。结果表明,重庆地区类似地层采用双侧壁导坑法施工大跨断面安全可行,施工阶段中开挖中部核心土是双侧壁工法的关键工序。

By Midas-GTS analysis software,FEM can be done to single-arched span section of Chongqing subways and then a qualitative analysis can be done.For the second lining,it makes a checking for the ultimate limit state of loading and for the limit state of normal using according to probabilistic limit state design.The result shows it＇s safe and feasible that application of double sidewall drift method in construction of span section in Chongqing.And in the construction phase,excavation of the central core soil is the key process in double sidewall method.