[Explanation] On April 7, the key control project of the Lhasa-Linzhi section of the Sichuan-Tibet Railway (Lalin Railway)-the Milin Tunnel and the Zangga Tunnel successfully opened on the same day. At this point, the 216.5-kilometer tunnels of the entire Lalin Railway line have been successfully completed. It is expected that the laying of the entire railway line will be completed by the end of 2020.

The Milin Tunnel is located in Milin County, Nyingchi City, Tibet. It is one of the six 10,000-meter long tunnels with the most difficult construction on the entire Lalin Railway. The average altitude is 3100 meters, the total length is 11560 meters, and the maximum buried depth is about 1200 meters. They are called the hardest bite.

[Same period] He Xu, commander of the Lalin Railway Command of China Railway 19th Bureau Group Co., Ltd.

The passage of the Milin tunnel is also a sign of the passage of all our tunnels, which means that all the tunnels of our Lalin Railway are fully connected. After the completion of the Milin tunnel, the remaining ballastless track construction and the task of erection of our 140-hole T-beam can be completed within two months, which means that the track laying task at the end of the year (2020) can be fully achieved.

[Explanation] It is reported that the Lalin Railway is located in the southeast of the Qinghai-Tibet Plateau, with a total length of 435 kilometers and a design speed of 160 kilometers per hour. It is the first electrified railway in Tibet. There are 47 newly built tunnels on the whole line, 216.5 kilometers, accounting for 53.69% of the total length of the line, including 6 extra-long tunnels over 10 kilometers long.

Since the construction of the Lalin Railway began, more than 20,000 railway builders have overcome many difficulties such as high cold and oxygen shortage, ecological fragility, complex geological structure, and frequent disasters. They have completed construction tasks in a safe, high-quality, and efficient manner. We have accumulated valuable experience in solving the construction problems of severe geological disasters.

[Same period] Zhu Jintang, Deputy General Manager of Tibet Railway Construction Co., Ltd.

In view of the special geological environment of the plateau, we have increased the intensity of scientific and technological research, and explored innovative technological methods to overcome the construction problems of world-class tunnels such as aeolian sand, harmful gases, high ground stress, high ground temperature, moraine layers, and research and application of wind protection and sand fixation. , Comprehensive cooling, water and mud inrush prevention and control, rockburst comprehensive treatment (control) and a series of construction technologies, which have formed many mature construction technologies and management experience, and obtained 32 patents. These scientific research results will be The construction of Linzhi section provides useful reference.

[Explanation] It is reported that as an important part of the Sichuan-Tibet Railway, the Lalin Railway is expected to be opened to traffic in 2021, which will not only effectively improve the layout of China's regional railway network, but also promote economic development along the route, improve people's livelihood, and promote the interconnection between the inside and outside of the region. Of great significance.

Reporter Gonsanram reports from Tibet Linzhi

Editor in charge: [Ji Xiang]