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According to the relevant person in charge of the second design institute of the railway, the Mipan section of the Chengdu-Kunming Railway double track line is located on the edge of the Sichuan Basin, connected to the Yunnan-Guizhou Plateau in the south, and has complex terrain and geological conditions , And there are more vegetable and fruit bases and mine holes along the route. To this end, the line uses “bridges instead of roads” and “tunnels instead of roads” to pass through bad geological sections. For example, the key control project Yakou Tunnel is 12447 meters long, traverses 6 sets of strata and 7 regional faults, and also passes through four 100-meter high piers on the Beijing-Kunming Expressway at the exit of the tunnel, one of which is a high pier It reaches 138 meters and has an axle load of 14,000 tons, which is the largest load for a single structure under a tunnel in the world. Ranjiawan Tunnel with a total length of 12,760 meters, runs through the unique Xigeda stratum in Panxi area. The stratum has poor water stability and is easy to disintegrate after being immersed in water. , Collapsing or even collapsing. While coping with unfavorable geology, it is also necessary to overcome numerous obstacles, including large surface structures underneath the 186 million cubic meters of Asia ’s first tailings reservoir Majiatian tailings reservoir, high-rise building structures in residential areas, among which are crossing Panzhihua In the large landscape artificial lake in Huacheng New District, the bottom of the lake is only 5 meters away from the top of the tunnel, which makes the design and construction extremely difficult. In addition, the main span of the Panzhihua Jinsha River Bridge is 208 meters, which is the largest-span prestressed concrete low-tower cable-stayed bridge of the same type in China. It is the first in China to adopt the anchoring technology of the upper cable-stayed cable beam beam anchor block. This technology is more convenient for construction and The monitoring during the later operation greatly reduces the maintenance cost. At the same time, the bridge is also China’s largest tonnage hyperboloid spherical bearing and shear tenon vibration isolation system, which has accumulated valuable experience for future railway construction to solve large spans and deep river valleys.