Dynamic Characteristics of Tunnel Bottom with Laying Type Ⅲ a Sleepers and Wide Sleepers in Heavy Haul Railway Tunnels
A dynamic analysis model was established to analyze the dynamic characteristics of the railway tunnel when a C80 type freight train traversing at a speed of 100 km/h with laying Type Ⅲ a sleepers and wide sleeper,based on the occurrence of slurry and mud defects in the foundation structure of tunnel.The results show that,the max dynamic compressive stress of the upper surface of filling layer shows a trend of Ⅲ a sleepers without defects>Ⅲ a sleepers with defects>wide sleepers without defects>wide sleepers with defects.Whether laying Ⅲ a sleepers or wide sleepers,the dynamic tensile stress on the bottom of inverted arch with defects is significantly higher than that without defects by about 50％,and the dynamic deformations of the upper surface of filling layer and the bottom of inverted arch with defects are significantly greater than that without defects by about 40％,the surface vibration acceleration of the upper surface of filling layer and the bottom of inverted arch with defects is significantly higher than that without defects by about 78.6％～82.9％,27.7％～36.5％respectively.Overall,the dynamic characteristics laying wide sleepers in the tunnel is better than that laying Ⅲ a sleepers.
heavy haul railwaytunnel bottom defectsleeper typenumerical simulationdynamic characteristicwide sleeperⅢ a sleeper
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