The "tunnel with stones flying like cannonballs" on the Sichuan Tibet railway has passed through

At 9:50 on November 2, the Bayu tunnel from Lhasa to Linzhi section of Sichuan Tibet railway was successfully completed. In the process of construction, the highest record of 7015 meters of single head driving of plateau railway tunnel was set. Bayu tunnel is the largest plateau railway tunnel in the world with the strongest rock burst, the longest single head driving distance and the largest buried depth in China. It is called "the tunnel with stones flying like shells" by the builders. The builders have overcome thousands of rock burst threats and have safely run through the whole tunnel The main tunnel of

Bayu tunnel is 13073 meters in length, 9481 meters in total length, 3500 meters in maximum altitude, 2080 meters in maximum buried depth, and 47 degrees Celsius in maximum temperature. 94% of them are located in the rockburst area, with high intensity and frequency. Generally, the rockburst lasts for 2 to 6 hours, lasting for more than a week, even months after the occurrence of rockburst There are two times of rock burst, which is very rare in the world tunnel construction history. In addition, limited by special geographical conditions, the tunnel can not be set with auxiliary tunnel, only from the two ends of the inlet and outlet of the single head driving As an important throat of Lalin railway,

will play a very important role in promoting the economic and social development of Tibet and laying a foundation for the early opening of Sichuan Tibet railway