上软下硬地层单拱大跨地铁车站施工工法优化分析

为了能够适应上软下硬地层，在保证安全的基础上具有一定的经济效益，隧道工作者在PBA工法的基础上形成了拱盖法施工工法。以贵阳轨道交通2号线阳明祠地铁车站为工程背景，以三维有限差分元数值计算手段，结合工程区域地质条件及周边建设环境，考虑施工安全、施工工期，综合对比不同工况，对阳明祠地铁车站原设计的拱盖法施工工法进行了优化，并深入探讨了拱盖法的基本思想，提出了应针对工程区域特殊建设环境合理应用拱盖法。

Optimization Analysis on Construction Methods of Single Arch and Large Span Subway Station in Upper-soft and Lower-hard Ground

In order to adapt to the upper-soft and lower-hard ground and has economic benefits on the basis of construction safety, the arch cover method has been invented based on the PBA construction method by the tunnel workers. In this paper, based on the Guiyang metro line 2 Yangmingci subway station, with the three-dimensional finite difference numerical simulation, the construction method of Yangmingci subway station has been analyzed and optimized based on the geological conditions and surrounding construction environment, considering the construction safety and time of construction and comprehensively comparing different working conditions. The basic idea of arch cover method has been discussed deeply and that the arch cover method should be applied to the special construction environment of the engineering area has been put forward.