三台阶七步开挖法在大断面隧道施工中的应用

Application of Three-bench Seven-step Excavation Method in Large Section Tunnel Construction

三台阶七步开挖法作为三台阶法的延伸,正越来越多地应用到大断面隧道施工中。以兰渝铁路香木湾隧道工程为例,对三台阶七步开挖法的特点、施工组织、工艺流程、施工要点等进行了详细的介绍。

Three-bench Seven-step excavation is the development of three-bench excavation,which is more and more applied in large section tunnel construction.Take the engineering case of Xiangmuwan tunnel of Lanzhou-Chongqing railway,the excavation characteristics,construction organization,technological process and construction key points were introduced in detail.