丘陵地貌小净距隧道“零”开挖单向出洞技术

Unidirectional Exit Technique for “Zero” Excavation of Small Clean Distance Tunnel in Hilly Landform

以靖黎高速公路蛇岭隧道出洞施工为依托,结合隧道超前地质预报及现场实际情况,利用双层注浆超前小导管对围岩的支护能力取代大管棚,优化出洞方式,对独头掘进隧道“零”开挖出洞技术进行了分析总结。

Based on the tunnel exit construction of Sheling tunnel of Jingli expressway, combined with the advance geological forecast and the actual situation of the tunnel, this paper analyzes and summarizes the“zero”excavation exit technology of single-head tunneling tunnel by using the supporting capacity of double-layer grouting leading small pipe instead of large pipe shed to support the surrounding rock.