▎Yichang to Badong Expressway Bridge Reconstruction Project. The project is located between Miaowan No. 1 and No. 2 tunnels. The original plan was for bridge erection. Because the bridge was between the four tunnels, the tunnel spoil was excavated on the inner side in the early stage and could not be transported out. After backfilling on site, it was difficult to excavate the piers with a thicker overburden. In the later period, the spoil ground of the four tunnels was 6KM away. , The transportation distance is far and the spoil ground needs to be requisitioned. The overall cost is high, and it is better to digest and discard waste on the spot. However, if the natural slope is adopted, the maximum height is as high as 51.5m, and the foot of the natural slope will block the river.

▎Due to the overall plan of the development zone, the Dalian road needs to be excavated. The original plan was to excavate into a gap, but the gap formed after excavation due to the high mountain is not beautiful, and to prevent the rock slope from falling and weathering after the excavation. stone. After half of the mountain excavation, the development zone government plans to change the mountain gap excavation plan to a tunnel plan. At this time, most of the mountain has been dug, and a large area of ​​rock is exposed. How to restore the vegetation of the mountain has become a very difficult problem.