镇安隧道贯通！是西渝高铁全线首个超4公里的单洞双线隧道

Core Points - The construction of the Xiyu High-Speed Railway has achieved a significant breakthrough with the successful completion of the Zhen'an Tunnel, which is the first single-hole double-track tunnel over 4 kilometers in length [1] - The Zhen'an Tunnel, located in Kaizhou District, Chongqing, is 4,458 meters long and presents various geological challenges, including shallow burial depth and poor rock stability [3] - The Xiyu High-Speed Railway's main line, spanning 478 kilometers with a design speed of 350 km/h, will connect multiple existing and under-construction high-speed rail lines, enhancing transportation in the central and western regions of China [5] Group 1 - The Zhen'an Tunnel is a key component of the Xiyu High-Speed Railway, which is part of China's "eight vertical and eight horizontal" high-speed rail network [1] - The construction faced significant challenges due to geological conditions, prompting the use of advanced techniques such as geological radar and long-distance drilling to ensure safety and efficiency [3] - The completion of the Xiyu High-Speed Railway is expected to improve regional connectivity, support poverty alleviation efforts, and promote rural revitalization and urban-rural integration [5]