Core Points - The Bianghui Tunnel, a key project of the Yukun High-speed Railway, has successfully completed its construction, marking it as the first super-long tunnel over 20 kilometers in the southwest region of China [1] - The tunnel, located in Yiliang County, Zhaotong City, Yunnan Province, features a dual-tube single-line design and is classified as a high-risk tunnel due to its complex geological conditions [1] - With the completion of the Bianghui Tunnel, the overall tunnel construction progress in Yunnan for the Yukun High-speed Railway has reached 85%, and over 95% of bridge and tunnel construction has been completed [1] Industry Progress - The Yukun High-speed Railway is entering a critical construction phase, with the main body of the roadbed, bridges, and tunnels nearly completed [1] - The project is now accelerating the construction of the "four electrics" and station building works, preparing to fully enter the ballastless track construction phase [1]

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]

Core Points - The completion of the Binghui Tunnel, a 21.17-kilometer long tunnel, marks a significant milestone for the Yukun High-Speed Railway, being the first ultra-long tunnel over 20 kilometers in Southwest China [1][3] - The tunnel features a dual-tube single-line design and is classified as a first-level high-risk tunnel due to its complex geological conditions [3] - The Yukun High-Speed Railway is a crucial part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, with a total length of approximately 700 kilometers, significantly reducing travel time between Chongqing and Kunming [5] Construction Challenges - The construction faced multiple complex geological issues, including soft rock deformation and water inflow, leading to the proposal of 37 emergency solutions by participating units to enhance construction efficiency [3] Economic Impact - Once fully operational, the Yukun High-Speed Railway will greatly improve transportation convenience in the Southwest region and promote regional economic collaboration [5]