Wave Propagation/Impediment in a Soil Stratum Over Rigid Base Due to Impulse/Moving Loads

Ground Vibration Generated by a Load Moving Along a Railway Track

“…Takemiya and Goda [8] divide the source of vibration excitation from a single axle into three components. The "rst, similarly to reference [7], is a moving non-harmonic load, the second, a "xed-point dynamic loading at the track, and the third, a moving harmonic load to represent the dynamic vehicle forces.…”

Ground Vibration Generated by a Harmonic Load Acting on a Railway Track

“…Takemiya [12] divides the sources of excitation of vibration from a train into three types of force: (i) a "xed-point dynamic force due to the irregularity of the track (this is an impulse in the time domain), (ii) a moving non-harmonic axle load, and (iii) a moving harmonic load due to irregularities of the wheel and the e!ects of the vibrational modes of the vehicle suspension. The solution for moving nonoscillatory axle loads (ii) has been pursued by some workers [13,14] having an interest in the generation of vibration from high-speed trains that approach, and exceed, the wave speeds in the ground.…”

“…Thus references [8,12] show that a model in which the loading has a broad band of frequency but is stationary on the track is appropriate for use in a number of studies of ground vibration. This is the subject of the present paper.…”

“…It is also shown in reference [2] that a model in which the ground is represented as a single homogeneous elastic layer overlying a half-space can predict measured transfer response functions of a real ground site. The importance of modelling the ground layers is also emphasized in reference [12].…”