Why is there such a big difference in the weather at both ends of Mudan Tunnel?

Because the mud mountain is in the Hengduan Mountains, it goes to the other side after leaving the tunnel, so the weather is very different.

Bashan Tunnel, with a total length of 10 kilometers, is a typical project of difficult highway tunnels in complex mountainous areas in western China. The tunnel crosses the 17 fault, and the buried depth exceeds 1000 m to 5 km, the maximum buried depth reaches 1650 m, the ventilation inclined shaft is 1500 m, and the underground fan room is 6000 square meters, all of which are the largest in China.

The Nishan Tunnel in Daxiangling is divided into two lines, the left line is 9962 meters long and the right line is 10007 meters long. It is also the longest complex geological tunnel under construction in southwest China and the deepest buried tunnel in China.

Nishan tunnel is located at the edge of Longmenshan active fault zone, with harsh natural and geographical conditions and rich groundwater. In addition to gas, the construction is very difficult, combined with geological disasters such as high-pressure water inrush, large deformation, fault and rockburst.

On February 24th, the left line of 20 1 165438 Daxiangling Nishan Tunnel was successfully and safely connected. At this point, this tunnel with a length of 10 km is officially connected in both directions, which also means that the Yaxi Expressway section in Ya 'an has been successfully connected.

Baidu Baike-Nishan Tunnel