项目背景

The Baoding Mountain–North Mountain Express Corridor is a key tourist transportation route connecting the Baoding Mountain Scenic Area and the North Mountain Scenic Area of the Dazu Rock Carvings in Chongqing. With a total length of 9.48 kilometers, the route includes two tunnels: Baotang Tunnel, a medium-length tunnel with each tube measuring approximately 880 meters, and Longgang Tunnel, a long tunnel with each tube measuring approximately 1,800 meters. Designed for a speed of 80 km/h and feat