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PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
Wave Propagation in a Ballasted Railway Track: A Stochastic Heterogeneous Approach
L. de Abreu Correa1, R. Cottereau1, C. Voivret2, S. Costa d'Aguiar2, E. Bongini2 and B. Faure2
1Laboratoire MSSMat UMR 8579, Centrale Supelec, CNRS, Chatenay-Malabry, France
L. de Abreu Correa, R. Cottereau, C. Voivret, S. Costa d'Aguiar, E. Bongini, B. Faure, "Wave Propagation in a Ballasted Railway Track: A Stochastic Heterogeneous Approach", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 25, 2016. doi:10.4203/ccp.110.25
Keywords: wave propagation, granular media, ballasted railway track, stochastic modeling, spectral element method.
The work, described in this paper, is an investigation of the dynamic behavior of a ballasted railway track modeled as a stochastic heterogeneous media. Three-dimensional simulations carried out using the spectral element method were used to generate the results. This leads to a comparison, in the frequency space, of different ratios of mechanical properties of soil and ballast together with homogeneous compared with heterogeneous models. The presence of dispersion in the homogeneous case and the influence of the heterogeneities are stressed. Additional apparent damping is induced in the free field in the heterogeneous case.
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