Aerodynamic Behavior of Flaky Falling Blocks in High-speed Railway Tunnels and Its Influence on Operation Safety
The deteriorating lining defects of high-speed railway tunnels and the problem of lining falling endanger the safety of train operation greatly.In order to explore the impact of lining falling blocks on operation safety in tunnels,a three-dimensional numerical model of air-tunnel-lining falling block-train was established to analyze the aerodynamic be-havior of lining falling blocks under the condition of train operation,and to study the influence of the initial falling posi-tion of falling flaky lining blocks on the operation safety.The results show that the longitudinal displacements of the flaky falling blocks at different spalling locations along the tunnel are all negative values.The average longitudinal displace-ment of vault falling blocks along the tunnel is 1.45 times that of the side wall falling blocks.The lateral movement dis-placement of the falling blocks on the upper side wall is about 2～3 times that of the vault falling blocks.With the in-crease of the distance from the center line of the tunnel,the falling blocks of the vault are influenced more significantly by the flow field structure,with greater initial peak acceleration.The falling block of the vault may directly collide with the train.The falling block of the upper side wall may collide with the side of the train or be drawn into the wheel and rail.The falling block of the lower side wall moves away from the train body and has no impact on the operation safety.The results have reference value for the prevention and control of high-speed railway tunnel lining defects in the future.
NETL
NSTL
万方数据
