渝昆高铁首座超20公里特长隧道贯通

Core Insights - The construction of the Yukun High-Speed Railway has achieved a significant milestone with the completion of the Binghui Tunnel, which is the first tunnel over 20 kilometers in length along the entire railway line [1][2] - The Yukun High-Speed Railway, part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, spans approximately 700 kilometers, with 388.6 kilometers located within Yunnan Province, and is designed for a maximum speed of 350 kilometers per hour [1][2] Group 1 - The Binghui Tunnel, located in Yiliang County, Zhaotong City, Yunnan Province, is a key control project for the Yukun High-Speed Railway, characterized as a high-risk tunnel due to various geological challenges [1][2] - The construction utilized advanced techniques such as "2 horizontal tunnels + 2 inclined shafts + 1 flat guide" and implemented a multi-faceted defense strategy to manage geological risks, achieving a maximum monthly excavation rate of 135 meters [2] - The completion of the Yukun High-Speed Railway is expected to significantly reduce travel time between Chongqing and Kunming, enhancing transportation convenience in the southwest region and promoting regional economic collaboration [2]