突破3000米！海太长江隧道掘进任务完成近三分之一

Core Insights - The construction of the Haitai Yangtze River Tunnel, undertaken by China Railway 14th Bureau, has achieved a significant milestone with the "Jianghai" shield machine surpassing 3,000 meters of excavation, completing nearly one-third of the total excavation task, marking a phase victory for the project [1] Group 1: Project Overview - The Haitai Yangtze River Tunnel stretches 39.07 kilometers, with an underwater section of 11.185 kilometers, making it the world's longest underwater highway shield tunnel [3] - The project faces challenges such as ultra-long distances, large diameters, high water pressure, deep burial, and complex working conditions, with a shield excavation diameter exceeding 16.6 meters and a maximum burial depth of 75 meters [3] Group 2: Technical Achievements - Since the start of excavation in April 2025, the project team has utilized their extensive experience in large shield tunnel construction, achieving a steady excavation rate of 16 meters per day and 480 meters per month at a depth of 52 meters [4] - The team has implemented a "Digital Shield Intelligent Control Center" for 24-hour monitoring of excavation parameters, grouting quality, and equipment status, leveraging big data for intelligent decision-making and precise construction [4] Group 3: Strategic Importance - The construction of the Haitai Yangtze River Tunnel is crucial for the integrated development of the Yangtze River Delta region and the national strategy for the Yangtze Economic Belt, optimizing the layout of river-crossing channels and promoting urban integration in the Yangtze River Delta [5] - The project is expected to be completed and opened to traffic by 2028, significantly reducing the travel time from Nantong to Suzhou and Shanghai from 1 hour to 10 minutes, thereby alleviating traffic pressure on the Sutong Yangtze River Bridge and accelerating the formation of the "1-hour economic circle" in the Yangtze River Delta [5]