Analysis of Segment Stress Characteristics of Super Large Shield Tunnel During Construction
In order to investigate the mechanical behavior of the segments during the construction period of a super large diameter shield tunnel,a finite element model of the stress during the construction period of the super large diameter shield tunnel was established based on a certain super large diameter tunnel project in Wuhan.The influence of jack thrust and slurry timeliness was considered,and the deformation and stress mechanism of the segments under different working conditions during the shield tunnel excavation process was simulated.The research results indicate that the influence of jack thrust and slurry aging on the deformation of the pipe segment is mainly concentrated in the L1 and L2 segments,approximately 3～13 rings,while the influence on the force on the pipe segment is mainly concentrated in the L0 and L1 segments,approximately 1～8 rings.As the thrust of the jack increases or the solidification time of the slurry decreases,the upward deformation of the pipe segment,horizontal and vertical convergence,misalignment deformation,and joint opening all show a decreasing trend.The maximum compressive stress of the pipe segment increases with the increase of the jack thrust or the solidification time of the slurry.The stress concentration at the action ring of the jack is obvious,and the greater the thrust of the jack,the more obvious this phenomenon becomes.
tunnelsshieldssegmentdeformationfinite element analysis
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