PREDICTION METHOD OF TRAIN-INDUCED GROUND VIBRATION BY PULSE TRAIN INPUT : LEVEL TRACK

Abstract

A method for the prediction of the propagation of ground vibration from a railway train is investigated. It is assumed that the rail and sleeper are one body. In the case of a joined rail with splice plates, the rail is excited by shocks from wheels passing over the rail joints. In the case of a joined rail by welding, the rail is excited by shocks from wheels passing through predetermined points on the rail. In both cases, it is considered that the vibrations generated at the rail are damped free vibrations and the input to the ballast is given by the power spectrum density of the pulse train led by the envelope function of that vibration. The ballast, roadbed and ground are treated as a concentrated constant systems. This method is applied to a level track, and prediction values are compared with measured ones.