After more than three years, on May 20, a nearly 4000-metre long tunnel from Lhasa to Linzhi of Sichuan-Tibet Railway (referred to as Lalin Railway) was connected.
Tibetan Rila Tunnel is located in Jiacha County, Tibet Autonomous Region, with an average altitude of more than 3200 meters and a total length of 3964 meters. All of the tunnels are single-track tunnels with a maximum depth of 392 meters. The smooth running-through of the tunnel marks another stage breakthrough in a class I extremely high-risk tunnel and a key and difficult control project, which lays a solid foundation for the promotion and construction of the post-erection task.
Mou Yi, chief engineer of the Lalin Railway Project of the Second Bureau of CREC, said that the Tibetan Rila Tunnel is a class I tunnel with extremely high risk because of its complex geology, large deformation easily occurring in water and high difficulty in tunnel construction and potential safety hazards. Located in the plateau area, the climate is cold and anoxic, and the maximum temperature difference between day and night is up to 30 degrees, which brings great challenges to builders and mechanical efficiency.
It is reported that since October 2015, more than 1890 sets of construction machinery and equipment have been put into the Lalin Railway Project of the Second Bureau of CREC, such as loaders, excavators, dredgers and other construction machinery and equipment. Nearly 6,000 workers have participated in the construction. After more than 1,300 days and nights of struggle by all the participants, the Tibetan Daily Tunnel has been successfully connected, 200 days ahead of the design period, in order to ensure the erection of beams. Duration node objectives provide a prerequisite.
Mou Yi said that the Lalin Railway is an important part of the Sichuan-Tibet and Yunnan-Tibet Railways, and an important land passage connecting the southwest frontier and the mainland. The Lalin Railway is of great significance in promoting economic development along the railway, improving people's livelihood, promoting internal and external interconnection in Tibet, and breaking the bottleneck of infrastructure.