浅埋偏压大跨地铁车站拱盖法施工力学及体系转化研究

STUDY ON THE MECHANICS OF CONSTRUCTION PROCESS AND SYSTEM TRANSFORMATION OF ARCH-COVER METHOD FOR SHALLOWLY BURIED BIASED LARGE-SPAN SUBWAY STATION-TAKING FUZHOU SUBWAY MAJIANGDU STATION AS AN EXAMPLE

拱盖结构是拱盖法的关键,不同的拱盖法临时支撑拆除与拱盖修筑时序不同,不同工法的体系转换也是拱盖法研究的重点。依托福州地铁马江渡站,属于典型的浅埋偏压大跨地铁车站,进行拱盖法施工过程的三维仿真,得到初期支护拱盖法和二次衬砌拱盖法施工过程中,地铁车站围岩塑性区、围岩应力、拱盖应力及重要位置的位移演变规律,为工程施工提供参考。

The arch cover structure is the key of arch cover method,different arch cover method temporary support removal and arch cover construction timing is different,and the system conversion of different work methods is also the focus of arch cover method research.In this paper,based on the Fuzhou Metro Majiangdu Station,which is a typical shallow buried partial pressure large span metro station,the three-dimensional simulation of the arch cover method construction process is carried out to obtain the plastic zone of the surrounding rock of the metro station,the surrounding rock stress,the arch cover stress and the displacement evolution law of the important position during the construction process of the initial support arch cover method and the second lining arch cover method,so as to provide reference for the engineering construction.