Recently, with boring of the last 1m of surrounding rocks at the arch finished, the up track of the 20km-long Yuelongmen Tunnel, one of the critical works of Chengdu-Lanzhou Railway, was cut through, laying a solid foundation for the completion of the whole Chengdu-Lanzhou Railway.
As a double-tube tunnel, the Yuelongmen Tunnel has an up track of 19.981km and a down track of 20.042km, with a total length of 71km including the service galleries. The tunnel passes through the towering Longmen Mountain, with a maximum burial depth of 1,445m, a single-sided uphill slope and an elevation difference of 346.3m between the entrance and exit.
The tunnel is one of the critical works of Chengdu-Lanzhou Railway, with steep terrain, large difference in elevation among the valleys and the mountains, and frequent geological disasters, featuring "four extremes, three heights and five complexities". Since the construction of Yuelongmen Tunnel started in 2013, the constructors have established scientific control technology and dynamic management research, so that the progress of Yuelongmen Tunnel can be effectively controlled and that of the whole line can be orderly and steadily advanced.
It is reported that Chengdu-Lanzhou Railway will put an end to the history of no railway in northwest Sichuan, and form a trunk railway corridor connecting northwest China with southwest China and the coast of south China together with the existing Baoji-Chengdu Railway, Lanzhou-Chongqing Railway and Chengdu-Xi'an Railway, which is conducive to the full play of resource advantages and location advantages in northwest and southwest China, and also significant for the coordinated development of regional economy and society and the unity and progress of regions inhabited by ethnic groups.