Research on Micro Settlement Control Technology for Shield Closely Tunneling Under Existing Railway and Highway Shared Frame Bridges
At present,with the rise of urban rail transit projects,more and more shield tunnels are penetrating complex existing buildings,which brings great safety hazards.Based on the rail transit project of Ziyang Line tunneling under the railway and highway shared frame bridge,this paper proposes the micro settlement control technology for shield tunneling,establishes a three-dimensional model of shield tunneling under the railway and highway shared frame bridge,explores the deformation and stress changes of the Chengdu-Chongqing railway track and the pier and abutment of the Chengdu-Chongqing railway line frame bridge,and reveals the safety and effectiveness of measures for the double track under the Ziyang Line shield tunneling section to cross the Chengdu-Chongqing Railway.The research results can provide technical reference for the safety analysis of shield tunneling under railways,and have practical guidance for future underground engineering.
rail transitunderpassrailway and highway shared frame bridgemicro settlement controlnumerical simulation
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