This tunnel is 100 meters long. Why did you dig for six years?

When this tunnel is dug, it will collapse every time it is less than 1 m, just like drilling a hole in the bean curd brain. Therefore, in the process of excavation of this tunnel, it is a process of repeated excavation, propulsion, collapse, continuous excavation and collapse. Many foreign experts came to the scene and said it was an impossible task.

Others may say, "Is it worth digging for six years for this 173m tunnel? It's better to change the line, it won't take so long. " First of all, you can give a positive answer, which is worthwhile! In fact, this line is not just a tunnel of 173 meters. Humaling Tunnel is only a part of lanzhou-chongqing railway, located at the junction of Yuzhong County in Lanzhou City and Weiyuan County in Dingxi City. The whole project needs to cross 18 regional fault zones and 8 main faults, with a total length of 13.438+0 km. The location where this special geological layer "tertiary water-rich silty fine sand" is encountered is at the last 3.6 kilometers of the tunnel.

The whole railway line has been planned, and the tunnels have been opened, leaving only the last 3.6 kilometers. Only this tunnel has been opened 10 km. If this tunnel is abandoned at this time, manpower and material resources will be a great waste of resources.

It is even more impossible to give up route planning. Lanzhou-chongqing railway is a new large-capacity transportation channel with equal emphasis on passengers and goods from northwest to southwest, which is of great significance. The completion of lanzhou-chongqing railway will greatly shorten the transportation distance and travel time between Lanzhou and Chongqing, and greatly improve the travel of people in the two places and cities along the way. It can make the rich resources such as agriculture, animal husbandry, nonferrous metals, coal and minerals along the line have a market, thus accelerating the economic development of the areas along the line and speeding up the people along the line to get rid of poverty and become rich.