Wushaoling Tunnel

The Wushaoling Tunnel () is a 21.05 km dual-bore railway tunnel in Gansu, north-west China. The east-bound bore opened on 30 March 2006. The west-bound bore is expected to open in October 2006. It was briefly the longest railway tunnel in China until the opening of the 27.84 km Taihang Tunnel in late 2007.

Location 
Located on the Lanzhou-Wuwei section of the Lanzhou–Xinjiang Railway, the tunnel has reduced the distance between Dachaigou and Longgou by 30.4 km. Key to the "Eurasian Land Bridge", the tunnel is part of the 3,651 km section linking Lianyungang on the East China Sea coast with Ürümqi in Northwest China.

Administratively, the tunnel is located within two county-level units of Wuwei Prefecture-level City. The eastern (actually, southeastern) portal is in Bairi Tibetan Autonomous County (a.k.a. Tianzhu Tibetan  Autonomous County); the western (actually, northwestern) portal, in Gulang County.

Infrastructure 
The tunnel consists of two bores with centres separated by 40 m. It is designed to allow speeds of 160 km/h. The tunnel travels through complex geology, involving four regional fault zones and soft rock. The New Austrian Tunnelling method was adopted as the construction technique. An elliptical cross-section (horseshoe shape) was used for the majority of the tunnel, with a circular section used in the geologically challenging Fault Zone No. 7. The right (east-bound) bore was constructed first, while the left tunnel was a parallel drift with smaller diameter to be enlarged later. The gradient is mainly 1.1%. The Wuwei portal has an altitude of 2447 m, and the Lanzhou portal 2663 m. The maximum depth of the tunnel is 1100 m.

On 26 June 2003 Interfax reported that the total investment for the project was ¥ 7 billion ($845 million), that the project commenced construction in November 2002 and that it was scheduled to take six and a half years to complete. Also reported was that Chinese steel manufacturer Lingyuan Iron and Steel (Linggang) would provide 4,360 tons of steel products for the tunnel project.

Coordinates
Lanzhou portal (east): , north of Dachaigou Town in Bairi Tibetan Autonomous County
Wuwei portal (west): , south of Heisongyi Town in Gulang County

References

Category:Railway tunnels in China
Category:Transport in Gansu
Category:Tunnels completed in 2006
Category:Buildings and structures in Gansu