隧道Ⅳ级围岩软弱段三台阶法施工技术

Tunnel Construction at the Weak section of IV Wall Rock by Means of Three-stage operation

随着我国交通建设的快速发展,隧道修建越来越多。软弱围岩段是隧道施工的重点和难点。本文结合某隧道实体工程,详细阐述了三台阶法施工的特点、步骤、爆破施工和初期支护施工。采用该方法安全高效地完成该隧道Ⅳ级围岩软弱段施工,表明采用的施工方法是成功的,可供同类工程施工参考。

With the rapid development of railway construction in China, tunnel construction becomes more important with more and more constructions. Operation at the weak sections of Wall Rock becomes the key point with more difficulties. The paper describes a tunnel construction project related to the construction features of three-stage operation, the operation process, blasting construction and preliminary support work. The whole construction for the weak sections of wall rock was completed successfully featuring high effectiveness and safety. The successful experiences can be applied to other similar projects.