Dynamic Analysis Of Unit Plate Track And Tunnel Under Train Loading

With the development of the underpass system in our country, the vibration problem which is aroused by the passing moving metro vehicle become more and more serious. The uneasy and damage brought by the traffic vibration has been considered to be one of the most unbearable public nuisance So, research on the vibration induced by metro vehicle is urgent and important.The vibration of metro is induced by the unsmooth of track and so the relative movement between the track and wheel. The vibration is transmitted by the track structure to the tunnel structure, inducing the vibration of soil around the tunnel, and is finally transmitted to the overgroud building nearby. It would be influenced the life of the public.Locomotive model is founded by SIMPACK, then extract data of wheel-rail force of the track irregularity curve is inputted. The slab ballastless track is founded based on introducing the main kinds of ballastless track of our country. It lays special stress on analyzing the dynamical response of slab ballastless track, by using numerical simulation, vibratory response of the rail structure under a subway train load is analysed. In addition, vibratory rate is judged by vibration acceleration. Several pararmeters which influence the dynamic response of track structure were taken into account during the analysis. A conclusion that with the rail fastener increasing of stiffness, vibration acceleration of track system response decreased, with the minishing of the stiffness and the increasing of the damping ratio of track structure, the dynamic response of the track structure is reducing is reachedAt the same time, also analyzed the force and deformation of arch, side wall, the inverted arch of the circular tunnel section under Metro loading, and summarizes the response law, for programme works.charts41,table21,reference46.