西康高铁全线隧道贯通

Core Viewpoint - The successful completion of the Qunling Jiutianshan Tunnel marks a significant milestone in the construction of the Xikang High-Speed Railway, with all 20 tunnels now completed and various other construction phases underway [1][2] Group 1: Construction Progress - The Xikang High-Speed Railway has completed all 20 tunnels, with bridge engineering at 89.7% completion, roadbed engineering at 77.5%, and ballastless track engineering at 16.2% [1] - Six new stations, including Xi'an East, Taihe, Zhashui West, Zhen'an West, Tongmu, and Ankang West, have commenced construction [1] Group 2: Technical Challenges - The Qunling Jiutianshan Tunnel, measuring 13.3 kilometers in length and located in a geologically complex area, is classified as a high-risk tunnel due to potential geological hazards such as rock bursts and karst formations [1][2] - The total length of the new main line is approximately 171 kilometers, with 20 tunnels totaling 141.913 kilometers and a bridge-tunnel total length of 161.310 kilometers, accounting for 94.41% of the line [2] Group 3: Economic Impact - Upon completion, the travel time from Xi'an to Ankang will be reduced from approximately 3 hours to under 1 hour, significantly enhancing passenger and freight transport services along the route [2] - The railway is a crucial part of the national medium- and long-term railway network plan, contributing to regional economic development and supporting rural revitalization efforts [2]