铁路隧道软弱围岩地段斜井进主洞挑顶施工技术

Construction Technology of Railway Tunnel in Soft Rock Section Inclined Shaft into Main Tunnel Roof Ripping

在长大隧道的施工过程中,为了满足工期和运营的需要,往往需要增设斜井。斜井施工完成后,需要进行挑顶,以逐步扩大到主洞的大断面施工。通往主洞施工的过渡段受力复杂,处理不好可能形成长久的安全隐患,所以斜井挑顶进主洞是施工的重点。本文结合张庄特长隧道施工情况,介绍了隧道软弱围岩斜井进主洞"外包法"施工技术,安全又快速的方式保证了斜井进入主洞施工。

In the long tunnel construction process, in order to meet the need of duration and operating, it is often needed the additional inclined shaft. After Inclined shaft completion of the construction, it needs to roof ripping so as to gradually expand to the construction of large cross main tunnel. If it is not handled properly to main tunnel transition section construction of complex stress, there will be a long-term security risk. So the construction of inclined shaft into main tunnel roof ripping is the key in the process. In this ar-ticle, combining the Zhang Zhuang long tunnel construction case, it introduced ＂outer＂ construction tech-nology of inclined shaft weak surrounding rock into main tunnel, which is a safe and quick way to ensure the construction of inclined shaft into main tunnel.