Innovation and Prospects of Shield Tunnelling Technology in Mixed Ground
Since the early 1990s,Guangzhou Metro has pioneered the introduction of combined shield machines to construct metro tunnels in the geologically complex strata of Guangzhou(known as the"Geological Museum").Through the first decade of comprehensive practice and systematic analysis from 1994 to 2005,a series of new con-cepts,viewpoints,and methods were proposed and defined,and over 100 km of high-quality metro tunnels were constructed,establishing a theoretical system for shield tunnelling technology in mixed ground.It has expanded the geological adaptability of the shield tunnelling method and laid a solid theoretical and practical foundation for its large-scale promotion,equipment localization,industrialization,and talent development.In the second decade(2006-2015),the theoretical system for shield tunnelling in mixed ground was further refined and developed.To re-solve the basic risk sources or factors of shield tunnelling in mixed ground such as"mud cake,hindered mucking,and spewing",innovations such as the"Hengdun Mud"chamber opening technology,the pioneering"Hidden Rock Body Environmental Blasting Technology,"and the"Auxiliary Air Pressure Tunnelling Technology"were developed and applied.Additionally,the application of new technologies such as dual-mode and air pressure cutter heads in shield machines led to the construction of a large number of long-distance,large-diameter,deep-buried,and com-plex geological tunnels,gradually establishing China as a major player in shield Tunnelling.In the recent decade(2016-),several advanced achievements have been officially released,such as the development and successful ap-plication of the multi-mode integrated"Tri-mode Tunnelling Machine",and research on the settlement causes and countermeasures in slurry shield construction in"extremely thick rock layer".These advancements enrich the shield tunnelling technology and help China move towards becoming a world leader in shield tunnelling.
Mixed groundShield tunnelTunneling technologyInnovation and prospects
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