Progress and Prospects of Construction Technology for Ultra-Large Diameter Underwater Shield Tunnels
With the development of the"Belt and Road"Initiative,the National Maritime Strategy,and Regional Economic Integration Strategic Layout,a large number of rail transit,highway,railway,and other large-scale infra-structure projects are facing the challenge of crossing rivers and seas.Starting from the Nanjing Yangtze River Tun-nel,Shanghai Yangtze River Tunnel,and Wuhan Yangtze River Tunnel,by introducing,assimilating,practicing,and re-innovating of shield tunnelling technology,China's underwater shield tunnel technology has entered a rapid development stage.A large number of completed and under-construction super underwater shield tunnel projects have greatly promoted the innovation,development,and progress of underwater shield tunnel technology in China and even the world,breaking through a series of technical bottlenecks in shield equipment,design,construction,opera-tion,and maintenance of underwater tunnel.The article systematically elaborates the three major elements of shield technology and their connotations,namely soil-water stability,shield equipment and control,structural safety and waterproofing,analyzes the current status and development trend of ultra-large diameter underwater shield tunnel technology at home and abroad,summarizes the important innovative achievements in ultra-large diameter underwa-ter shield tunnel technology in recent years,and proposes the technical challenges,countermeasures,and engineering application prospects of underwater shield tunnel with large diameter,long distance,high water pressure,and com-plex geological conditions.
Ultra-large diameterUnderwater shield tunnelCurrent research statusDevelopment trendTechnologi-cal innovationChallenges and countermeasures
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