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Dynamic Analysis of a Porous Layered Medium under a Load Moving along a Railway Track

The dynamic response of a poroviscoelastic layered soil medium subjected to a vertical harmonic rectangular moving load is proposed analytically. The moving excitation is applied either directly over the surface of the ground or over a track model. The track model due to Sheng et al. [17] takes into account rail, sleepers, pads and ballast. A parametric study is proposed in order to assess the influence of the various parameters on the dynamic response such as load velocity, frequency, porosity and permeability. A comparison between poroviscoelastic and viscoelastic models is considerd. The amplitude of the displacement response is also given for various values of beam rigidity in both sub- and super- Rayleigh regimes.