浅埋隧洞进洞关键施工技术

Key Construction Technology for Shallow Buried Tunnel Entry

钻爆隧洞进洞段往往埋深浅、围岩条件差,当遇到地下水丰富的情况下,进洞施工常出现隧洞坍塌、冒顶、变形等,施工安全风险大,处理成本高,且严重影响施工进度。文章依托韩江、榕江、练江水系连通后续优化工程钻爆隧洞施工,针对浅埋隧洞进洞施工,采取洞顶水泥土换填、套拱与支护桩连接形成整体、大管棚中间设置超前小导管及拱架底脚换填等措施,实现浅埋隧洞安全快速进洞,通过对该技术进行总结,形成浅埋隧洞进洞施工关键施工技术。

Drilling and blasting tunnels often have shallow burial depth and poor surrounding rock conditions.When encountering abundant groundwater,tunnel collapse,roof collapse,deformation,etc.often occur during tunnel construction,posing high construction safety risks,high treatment costs,and seriously affecting construction progress.The article relies on the subsequent optimization project of connecting the Hanjiang,Rongjiang,and Lianjiang water systems.For the construction of shallow buried tunnels,measures such as replacing cement soil at the top of the tunnel,connecting arches and support piles to form a whole,setting advanced small conduits in the middle of the large pipe shed,and replacing the bottom of the arch frame are taken to achieve safe and rapid entry into the tunnel.By summarizing this technology,key construction techniques for shallow buried tunnel entry construction have been developed.