Tang Shaohui, Zhang Xiaoping, Liu Hao,et al. 2021. Engineering dificulties and key technologies for undervater shield tunnel in complex ground [J]. Journal of Engineering Geology, 29(5): 1477- 1487. doi: 10. 13544/j.cnki.jeg.2020-044.
    Citation: Tang Shaohui, Zhang Xiaoping, Liu Hao,et al. 2021. Engineering dificulties and key technologies for undervater shield tunnel in complex ground [J]. Journal of Engineering Geology, 29(5): 1477- 1487. doi: 10. 13544/j.cnki.jeg.2020-044.

    ENGINEERING DIFFICULTIES AND KEY TECHNOLOGIES FOR UNDERWATER SHIELD TUNNEL IN COMPLEX GROUND

    • Chinese economic integration promotes the rapid development of urban transportation networks. Many underwater shield tunnels were constructed in recent years. Since the 21st century,the completion of a series of long distance and large diameter cross-river(or cross-sea) tunnels has marked the great progress of construction technologies for underwater tunnels. In order to promote the development of tunneling technology in complex ground and improve the construction efficiency of cross-river (or cross-sea)tunnels,the present study takes the recently constructed and representative underwater tunnels as research subjects and analyzes tunnel geological environment,shield tunneling technology and construction project management. Firstly,engineering difficulties and technical challenges for long distance shield tunnels under high water pressure are presented. These tunnels include the Nanjing Yangtze River Tunnel,Jinan Yellow River Tunnel,Nanjing Metro Line 10 Crossing River Tunnel,Sutong GIL Yangtze River Crossing Cable Tunnel and Xiamen Metro Line 2 Subsea Tunnel. Then,construction technologies for underwater tunnels in complex geological conditions are summarized. The conditions include abrasive sandy cobble ground,cohesive silty clay ground,high water pressure and permeable ground,underwater gas-rich ground and undersea dense boulder group ground. Finally,development trends of cross-river (or cross-sea)tunnels are prospected. They include the complexity of engineering geology,the diversification of shield equipment and the intelligentization of tunnel construction. The present study provides theoretical basis and technical support for the survey,design and construction of underwater shield tunnels under complex geological conditions in the future.
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