渝黔铁路天坪隧道大上半断面快速掘进施工技术

The Quick Large Cross Section Construction Technology for Tianping Tunnel of YuQian Railway

渝黔铁路天坪隧道原设计施工开挖工法为台阶法,为提高长大隧道施工进度,缩短工期,保证施工质量,降低安全风险,需兼用现代机械化配套施工,需对原设计工法进行优化,并形成了一种新的大上半断面工法。实践证明:新工法可行,且成功提高了天坪隧道施工的综合效益。

In the construction of the Tianping tunnel of YuQian railway in Chongqing,the design method was a step method. To improve the construction progress of long and large tunnels,shorten the construction period,ensure construction quality and reduce safety risks,the engineering method is optimized to form a new large-and-a-half-section construction method. The practice has proved that the construction of the new construction method is feasible and has successfully improved the overall benefits of the Tianping tunnel construction.