郑州地铁T型换乘站后期施工基坑的支撑布置优化

Optimization of Foundation Pit Support Layout in Post Construction at a T-type Metro Transfer Station in Zhengzhou City

在郑州地铁某T型换乘车站后期基坑开挖工程中,取消了水平斜撑,并在后期基坑开挖过程中对既有运营车站结构变形进行实时监测与仿真计算。根据施工现场监测数据,并结合三维有限元计算结果进行分析研究。研究结果表明,基坑开挖后换乘节点结构变形主要是由坑底隆起造成的竖向位移,取消水平斜撑后,既有车站的结构变形仍被控制在规范要求范围内。

In the post excavation project of a T-type transfer metro station in Zhengzhou City,the diagonal brace is canceled,the displacement of the transfer metro station during the excavation is monitored in real-time and simulated.According to the field monitoring data and combined with the result of 3D finite element calculation,it shows that the structural deformation in the transfer node after foundation pit excavation is mainly caused by the vertical displacement due to the pit uplift.Therefore,when the diagonal brace is canceled,the structure deformation of existing station will be controlled within the specification requirements.