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位于衡广复线坪乐段、粤北丛山密林之中的大瑶山隧道,全长14,295米,是我国目前最长的铁路双线隧道。担任大瑶山隧道出口工区施工任务的隧道局三处一队,从一九八二年七月开始进行了双线隧道全断面深孔爆破、机械化开挖施工,讫今已一年了。一年来,从施工组织,爆破开挖诸方面都取得了一些经验,现介绍于后。一、工程地质和施工概况
The Dayao Mountain Tunnel, located in the Hengpuan-Pingping section and the jungle of Congshan in the north of Guangdong Province, is 14,295 meters in length and is the longest double-track railway tunnel in China. As one of the three teams of the tunnel bureau under the construction task of the Dayao Mountain Tunnel Exit Area, the full-face deep hole blasting and mechanized excavation of the double-track tunnel started in July 1982 and has been completed for one year now. In the past year, some experiences have been gained from construction organization and blasting excavation. First, the engineering geology and construction overview