Ground vibration analysis caused by China railway high- speed with track geometric irregularities
A semi-analytical approach, considering the effects of track geometric irregularities on the wheel/rail force, is presented in this paper to simulate the ground vibration induced by moving train loading. The; train is studied as a secondary suspension mechanical system. The track and the attached sleepers are simplified as Euler beams resting on infinite half-space. Based on the compatibility condition of deformation, combining with the 2.51) FEM for layered soil, the semi-analytical solutions of dynamic wheel/rail forces are obtained implicitly. Detailed analyses and discussions of the wheel/rail forces and ground vibration are carried out. The results show that the track geometric irregularities exert an important influence on dynamic wheel/rail forces and ground vibration. With the track geometric irregularity unchanged, the wheel/rail forces linearly increase with the increasing train speed; With the wavelength of the track geometric irregularities unchanged, the wheel/rail forces and ground vibration acceleration increases with the increasing track irregularity amplitude; With the track irregularity amplitude unchanged, the wheel/rail forces and ground vibration acceleration decreases with the increasing wave length of track irregularities.
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