渝昆高铁首座超二十公里特长隧道贯通

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]