The tunnel around Lalin railway is smoothly connected
At 10:16 on the 18th, with a burst of blasting noise, the tunnel from Lhasa to Nyingchi railway was successfully completed. This is another long tunnel with an altitude of more than 3000 meters across the whole line of Lhasa Nyingchi railway, which marks another breakthrough in key and difficult projects along the line The
Lalin railway zharou tunnel is located in Milin County, Linzhi City, Tibet Autonomous Region, with an average altitude of 3100 meters and a total length of 4836 meters. It is one of the six class I high-risk tunnels in 47 tunnels of Lalin railway. In the process of tunnel construction, there are many kinds of geological problems, such as changeable surrounding rock, water gushing and mud gushing, high ground stress, etc. the rock burst area accounts for 38.4%
"the surrounding rock conditions we face in each blasting are different, and even in a short span of 20 meters, there will be three types of geological conditions of coexistence of soft rock, hard rock and water rich rock." Wang Shucheng, commander of the engineering headquarters of Lalin railway of China Railway 17th Bureau, said that the construction personnel should reasonably adjust the blasting parameters and support parameters, especially in the medium rock blasting section, the initial shotcreting of steel fiber concrete will increase the thickness of the initial support from 30 cm to 35 cm The
Lhasa Nyingchi railway is a key project of the 13th five year plan of the state, with a total length of 435.48 kilometers and a design speed of 160 kilometers per hour. It is the first electrified railway in Tibet. The geological conditions of the project are complex, and the bridge tunnel ratio is over 75%. At present, it has entered a critical period of construction. It is expected to be completed and opened to traffic in 2021, which will be of great significance to drive the economic development along the line, improve people's livelihood, and promote connectivity within and outside the region According to the data of
Tibet Railway Construction Co., Ltd., as of November 18, 119 bridges and 42 tunnels have been completed in the whole line, accounting for 98.8% of the total design length. Since the start of construction in 2015, 76% of the total investment has been completed. From October 2018 to now, Lalin railway has been laid for 106 kilometers.