渝昆高铁两座10公里以上特长隧道贯通

Core Viewpoint - The successful completion of the Hanjiaping and Nijiacun tunnels marks a significant milestone in the construction of the Yukun High-speed Railway, indicating that the project is entering a critical phase towards timely operation [1] Group 1: Project Progress - The Hanjiaping tunnel is 10.6 kilometers long, while the Nijiacun tunnel is 10.3 kilometers long, both being single-tube double-track tunnels [1] - A total of 45 tunnels have been completed in the Yukun High-speed Railway within Yunnan, achieving over 80% completion in tunnel construction [1] Group 2: Construction Challenges - The construction faced complex geological conditions, including sudden mud and water inflow, soft rock deformation, and harmful gases, which posed high safety risks and significant construction difficulties [1] - Targeted measures were implemented by the builders to ensure construction safety and quality [1] Group 3: Current Status - The Yukun High-speed Railway in Yunnan has entered a sprint phase, with the main body of the roadbed, bridges, and tunnels nearly completed, while the "four electrics" and station building projects are accelerating [1]