铁路复线三线隧道双侧壁导洞法施工技术

The Double Side Drift Construction Technique for Three-Track Railway Tunnels

在山岭地区修建铁路,因受地形限制,往往几条铁路穿越同一山脉,线路并行需要大断面隧道通过,例如在建的兰渝高铁(双线)就和遂渝二线(单线)穿越同一座山,形成三线大跨隧道。与其他双线铁路隧道相比,三线隧道具有跨度大、高度变化相对较小(即矢跨比变小)、结构形状更加扁平等特点。文章简要介绍了兰渝复线铁路唯一的一座三线隧道——新作坊隧道的"双侧壁导洞法"的施工工艺和关键技术,研究分析了施工方案优化及施工效果。

In mountain areas, it is common for several railways to run through the same mountain because of terrain restrictions, and in this ease a large-section tunnel with parallel lines is necessary. The Lanzhou-Chongqing high-speed railway （double-track） and the Suining-Chongqing high-speed railway （single-track）, which are under con- struction, pass through the same hill and form a three-track large-span tunnel. Compared with other double-lrack railway runnels, the three-track tunnel is characterized by its large span. relatively small height variation （i.e. small risespan ratio）, and flat structure shape. This paper briefly introduces the construction technology and techniques for the double side drift method adopted in the Xinzuofang Tunnel, which is the only three-track tunnel on the Lanzhou- Chongqing Railway.