松散破碎地质条件下山岭隧道斜井进洞施工技术

Construction Technology of Inclined Tunnel in Mountain Tunnel under Loose and Fractured Geological Conditions

因松散破碎地质条件下山岭隧道的地形横坡陡峭,施工进程缓慢,施工方案复杂,且缺乏斜井设计与施工技术的系统研究,因此,对松散破碎地质条件下山岭隧道斜井进洞施工技术进行合理设计分析与优化研究至关重要。针对坪田隧道进口端的特殊地理位置及工程特点,通过理论分析与实际工程结合的手段,研究制订了最优的山岭隧道的施工技术,其中包括斜井进洞方案、总体进洞施工安排步骤、斜井设计方案、斜井主要施工方案等几个关键方案,解决了从正洞进洞场地严重不足的问题,提出了极破碎地质条件下洞口段小导洞反向开挖出洞,解决了隧道无法正向开挖进洞难题,提供了隧道碴石外运通道和作业空间,保证了隧道洞口段施工安全,为该类工程提供借鉴。

Due to the steep terrain of the mountain tunnel under loose and broken geological conditions,the construction process is slow,the construction scheme is complicated,and there is no systematic research on the design and construction technology of inclined shafts,the construction technology of the inclined shaft into the mountain tunnel under loose and broken geological conditions is carried out reasonable design analysis and optimization research are essential.In view of the special geographical location and engineering characteristics of the entrance of Pingtian Tunnel,through the combination of theoretical analysis and actual engineering,the optimal mountain tunnel construction technology was researched and formulated,including the inclined shaft entry plan,the overall entry construction arrangement steps,and the inclined several key schemes,such as the well design scheme and the main construction scheme of the inclined shaft,have solved the problem of serious shortage of the entry site from the main tunnel,and proposed the reverse excavation of the small guide tunnel at the entrance of the tunnel section under extremely broken geological conditions,and solved the tunnel.The difficulty of digging into the tunnel in the forward direction is provided,and the tunnel ballast transportation channel and working space are provided,which ensures the construction safety of the tunnel entrance section and provides reference for such projects.