According to the report, Humaling Tunnel, a throat control project in lanzhou-chongqing railway, has a total length of 13 kilometers. It only takes five minutes for the train to pass through this tunnel, but it took more than eight years to pass through it. The rare worldwide problem of "tertiary water-rich fine sandstone" encountered in Humaling Tunnel is equivalent to tunneling in tofu brain, and a short tunnel of173m was drilled in 6 years.
The person in charge of lanzhou-chongqing railway Company said that many foreign experts had come to consult, and German experts with high reputation in railway tunnel construction failed to bring equipment and personnel. It was impossible to dig a tunnel in this stratum when they were evacuated, but they finally solved the problem independently.
In addition, the Muzhailing Tunnel, which has been built for nearly 9 years, has also overcome the rare complex geology in the world with independent innovation, with 87 major faults 10 in lanzhou-chongqing railway. Up to now, the whole line has obtained more than 30 national patents and overcome more than 70 scientific research projects at or above the provincial and ministerial levels.
I hope that China's railway construction technology can make a greater breakthrough!