STUDY OF EXISTING SUBWAY TUNNEL UNDER WATER-RICH SAND LAYER UNDER SHIELD TUNNELING
Based on the project of a subway line in Zhengzhou,the deformation characteristics of the existing subway tunnel under the condition of water-rich sand layer are studied by using Midas GTS finite element software numerical calculation,field monitoring and radar detection behind the tunnel wall.The results show that:the results of numerical simulation and field monitoring are basically consistent;Proper increase of bin pressure and driving speed in the driving process has a positive effect on controlling vertical deformation;The research results can provide reference for the safety construction of similar subway shield tunnel.
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