| The train-induced vibration will spread outward through the medium of around strata, and induce the secondary vibration of construction in further, which brings great influence to construction and people's daily life. How to diminish the environment pollution cased by vibration has become a very important problem.To get right proper evaluation of environment vibration, first of all we should master the mechanism of how the train induced vibration came into being .The track system is composed of rail sleeper ballast and substrate. When the train moves, the wheel and the track system will interact each other. Because of the action of the wheel, the track may bright bent transformation, and the transformation spread in the ground. Then the transformation changes into load which act on the foundation, thereof we calculate the wave's propagation in the ground.The present paper based on the mechanism of the vibration's production and transmission, simplifying the track system as elastic foundation beam model, and using a moving load which act on the beam to simulate the train, regarding four sorts of track system as research object, to evaluate the model of the vibration propagating of the track system under the moving load. Using the analytic method of finite elastic layer to calculate the transmission of the ground vibration, we get the displacement-time curve, acceleration-time curve and transfer function spectrum of ground under moving load, and analyze the result. In practice engineering calculation, this method is wildly used. Considering the cooperation of track system and ground, the present paper analyses the frequency response of track system and ground, and compares with the formerly research, getting some useful conclusion. For the track-viaduct-ground system, we use double-beam model to calculate its dynamic response under moving load, and analyze the transmission of the vibration in the system.At last, some problems about this research worth to be studied afterward are put up.
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