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我国目前正在建设的最长高瓦斯隧道兰州至重庆铁路客运专线梅岭关隧道,经过中国铁建十八局集团建设者三年多施工16日正式贯通,标志着制约兰渝铁路全线铺轨工期的难点按期突破。位于川、陕、甘三省交界处广元市的兰渝铁路梅岭关隧道,穿越川东北高瓦斯油气区,东距九龙山气田约30 km,西距射箭河气田约10 km。隧道设计为单洞双线,单洞双线
China is currently under construction the longest gas tunnel Lanzhou to Chongqing Meiling tunnel passenger railway line, after China Railway Construction eighteen Bureau group builders more than three years of construction more than 16 formally through, marking the constraints of Lan Yu railway laying all the time Difficult to break on schedule. The Meilingguan Tunnel at Lanzhou-Chongqing Railway in Guangyuan, at the junction of Sichuan, Shaanxi and Gansu provinces, passes through the high gas oil and gas zone in northeastern Sichuan. It is about 30 km east of Jiulongshan gas field and about 10 km west of Archer river gas field. Tunnel designed for single-hole two-lane, two-lane single-hole