软弱围岩隧道进洞段施工方案研究

文章首先介绍了超前大管棚的性能特点和适用条件，根据依托工程具体工程地质条件提出了适用大管棚进洞的施工方法，然后详细介绍了该隧道大管棚工法的施工过程和施工中需要注意的事项，为具体的洞口段进洞施工提供方案支持。

Study on the Construction Scheme of Weak Wall Rock Tunnel Holed Section

This paper introduces the characteristics and application conditions of large advance pipe roof, according to the geological conditions proposes the specific engineering project construction method for large pipe shed into the hole, and then introduces the matters need to pay attention to the construction process and construction of the tunnel pipe shed method, to provide support for the specific scheme of holed section construction.