滇中引水一期工程楚雄段隧洞全线贯通

Core Viewpoint - The completion of the last section of the Fengtun Tunnel marks a significant milestone for the Yunnan Province's largest-ever livelihood project, the Dianzhong Water Diversion Project, which aims to alleviate water resource conflicts in the region and improve the ecological environment of highland lakes [1][3]. Group 1: Project Overview - The Dianzhong Water Diversion Project spans three major river basins: the Jinsha River, Lancang River, and Red River, with a total length of 664 kilometers, benefiting over 11.12 million people across six states (cities) including Kunming and Chuxiong [3]. - The Chuxiong section of the project is 153.53 kilometers long, with 91.6% of it consisting of tunnels, and it traverses complex geological areas such as the "Dianzhong Red Layer" and the foothills of the Hengduan Mountains [3]. Group 2: Construction Challenges - The construction of the Chuxiong section faces four major global challenges: deep tunnel construction difficulties, groundwater management issues, crossing fractured fault zones, and dealing with significant soft rock deformation [3][5]. - The Fengtun Tunnel, which is 9.87 kilometers long, is a critical part of the Chuxiong section, with a maximum depth of 630 meters and extreme water inflow reaching 30,000 cubic meters per day [5]. Group 3: Technological Innovations - The construction team developed a "forewarning-dynamic adjustment-precise support" technical system to address the complex geological conditions, utilizing technologies such as TSP detection and transient electromagnetic methods to create a geological "perspective network" for real-time monitoring [5]. - The innovative "micro-step + locking large pipe shed" technique reduced soft rock deformation by 80%, achieving a 100% qualification rate for initial support [5].