双侧壁导坑法在高速公路隧道进口段进洞施工中的应用

The Application of Double-wall Tunnel Guide Method in the Construction of the Entrance Section of Expressway Tunnel

利用双侧壁导坑法施工高速公路隧道入口区域时,可以成功穿越软弱围岩段,避免此处出现过大的地表沉降现象,保障高速公路隧道入口处的施工安全性及围岩稳定性。论文介绍了双侧壁导坑法的施工特点及工艺原理,重点对其工艺流程、施工步骤及操作要点进行详细论述,提出了施工注意事项,为今后开挖软弱段隧道奠定了基础。

When constructing the entrance area of the expressway tunnel by using the double-wall tunnel guide method,the section of soft surrounding rock can be successfully passed through,and the excessive surface subsidence can be avoided here,and the construction safety and surrounding rock stability of the expressway tunnel entrance can be guaranteed.This paper introduces the construction characteristics and technology principle of double-wall tunnel guide method,focuses on the process,construction steps and operating points of the three aspects of the content of detailed discussion,put forward the construction matters needing attention,for the future excavation of the weak section of the tunnel to lay a foundation.