Dynamic Response Analysis of Near-spacing Twin Tunnels Surroundings Under Vibration Load of Metro
To explore the dynamic response characteristics of near-spacing twin tunnels surroundings under Vibration Load of Metro,a twin tunnels model is established by PFC2D and simulates three operating conditions of the subway:loading in the left tunnel,loading in the right tunnel,loading in both tunnels at the same time.Monitoring points and monitoring circles are set up in the middle area of the twin tunnels and the surroundings of the right tunnel,the speed,displacement,stress and strain of each monitoring position is obtained.The results indicate that:under vibration load of metro,the vertical velocity of the surroundings of the twin tunnels is much higher than the horizontal velocity;the closer the monitoring point in the middle area of the twin tunnels is to the bottom of the tunnel,the more violent the vertical velocity response are;the vertical velocity response of the upper surroundings of the twin tunnels is greater than the vertical velocity response of the lower surroundings;the vertical stress variation amplitude of the surroundings in the upper middle area and the surroundings at the top of the twin tunnels are the largest During the operation of the twin tunnels,the vertical displacement of the surroundings at the upper and lower parts of the middle area and the top of the twin tunnels should be monitored with emphasis when double row trains are running simultaneously.This research is aimed at providing a reference for dynamic response analysis of the segments and surroundings during the operation period of the twin tunnels.
close spaced twin tunnelsmetro vibration loadparticle flow methoddynamic response
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