渝昆高铁重难点工程宁靖里隧道贯通

Core Viewpoint - The completion of the Ningjingli Tunnel marks a significant milestone in the construction of the Yukun High-Speed Railway, with 40 tunnels now completed in the Yunnan section, representing 75% of the total tunnel work [1][2]. Group 1: Project Progress - The Ningjingli Tunnel, measuring 6,327 meters, is a critical and challenging project located in Huize County, Qujing City, Yunnan Province [1]. - Since the start of construction in September 2021, the tunnel has faced significant challenges, including a maximum daily water inflow exceeding 40,000 cubic meters, equivalent to filling over 20 international standard swimming pools in a single day [2]. - With the completion of the Ningjingli Tunnel, over 90% of the bridge and tunnel construction for the Yunnan section of the Yukun High-Speed Railway is finished, and 97% of the earthworks for the roadbed have been completed [2]. Group 2: Strategic Importance - The Yukun High-Speed Railway is a vital part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, with a total length of approximately 700 kilometers, of which the Yunnan section is 388.6 kilometers long [2]. - Once operational, the railway will significantly reduce travel time between Chongqing and Kunming, enhancing transportation convenience in the southwestern region of China [2].