达州段隧道全部贯通

Core Viewpoint - The completion of all tunnels in the Dazhou section of the Chengdu-Dazhou-Wanzhou high-speed railway lays a solid foundation for the timely construction of the railway, which is a crucial part of China's high-speed rail network [1] Group 1: Project Progress - The Dazhou section of the Chengdu-Dazhou-Wanzhou high-speed railway, which is 125 kilometers long, has achieved 95% completion in bridge girder erection and 10% completion in the ballastless track bed [1] - The E'ceng Mountain Tunnel, among others, has been successfully connected, marking the completion of all tunnels in this section [1] Group 2: Engineering Challenges - The Dazhou section includes key engineering challenges such as the Huaying Mountain Tunnel and the Changsheng Tunnel, which is one of the four high-risk tunnels with high gas levels along the entire line [1] - Since the project's commencement at the end of 2020, Dazhou has implemented a "special handling for railway matters" approach to support land use and material supply for the construction [1] Group 3: Strategic Importance - The Chengdu-Dazhou-Wanzhou high-speed railway is an important component of China's "eight vertical and eight horizontal" high-speed rail network, with a total length of 486.4 kilometers and a designed speed of 350 kilometers per hour [1] - Once completed, it will serve as a significant fast and convenient passage for eastern Sichuan to exit the province [1]