摘要
On December 8,2011, the last diversion tunnel in the world＇s largest tunnel group is broken through at the site of Jinping II Hydropower Station on Yalong River, Sichuan, China. The project has great significances in the great plan of West China Development and the power transmission from west to east. The tunnel group contains four diversion tunnels, one drainage tunnel and two traffic tunnels. The overall length is about 120 km. The other three diversion tunnels were drilled through on June 6, August 16, and October 20, 2011, respectively.
On December 8,2011, the last diversion tunnel in the world＇s largest tunnel group is broken through at the site of Jinping II Hydropower Station on Yalong River, Sichuan, China. The project has great significances in the great plan of West China Development and the power transmission from west to east. The tunnel group contains four diversion tunnels, one drainage tunnel and two traffic tunnels. The overall length is about 120 km. The other three diversion tunnels were drilled through on June 6, August 16, and October 20, 2011, respectively.
