位于京广铁路南段粤北坪石至乐昌的大瑶山隧道,全长14.295公里。是我国目前最长的双线电化铁路隧道,也是世界铁路长大隧道之一。担任出口工区施工任务的隧道局三处一队,自一九八二年七月实现双线隧道全断面深孔爆破,机械化开挖施工后,到一九八三年七月止,大瑶山隧道出口工区洞内开挖、衬砌施工己全部实现机械化施工作业。 The Dayaoshan Tunnel, located in the south of Beijing-Guangzhou Railway from Pingshi to Lechang in Guangdong Province, has a total length of 14.295 km. It is one of the longest double-track electrified railway tunnels in China and also one of the long-term tunnels of the world’s railways. As a team of three exporters in the tunnel area under the construction task of exporting work areas, since the full-face deep-hole blasting of double-track tunnels was completed in July 1982 and mechanized excavation was completed, by July 1983, Dayaoshan Excavation tunnel tunnel exit area, lining construction has all been mechanized construction operations.