当金山隧道施工关键措施

Key Construction Technologies of Dangjinshan Tunnel

在复杂的工程地质与水文条件下进行隧道工程施工时,确定适宜的施工技术措施是关键与必要的。结合敦格铁路当金山隧道的具体情况,对断层破碎带及富水带、隧道出口洪积扇细角砾土地段、隧道大变形处理及预防隧道发生失稳等施工关键措施进行研究。其中,针对断层破碎带及富水带的施工采取径向注浆、帷幕注浆、局部注浆方法,并介绍突涌水等情况的应对措施。对关键技术措施的应用效果进行论证,研究成果为同类隧道的施工提供借鉴。

It is necessary to determine appropriate construction technologies for tunnels amid complicated engineering geological and hydrological environment. The paper, based on detailed situations of Dangjinshan Tunnel of Dunhuang-Golmud Railway, studies the key construction technologies for fault fracture zone and water enriched zone, section with diluvial fan fine breccia soil at tunnel exit, major deformation and instability preventions. For instance, as for fault fracture zone and water enriched zone, such construction technologies as radial grouting, curtain grouting and local grouting as well as countermeasure for water gush are introduced. The paper also validates the application effects of such technologies and the study serves as a good reference for the constitution of other tunnels.