Abstract
The aim of this work is to numerically assess the influence of the random variability of railway track properties on the track response under moving load. A 2D dynamic finite element model with modified width plane strain condition of the railway track is performed. Random fields are generated based on statistics of dynamic cone penetration tests performed on a classical line by the French National Railway Company (SNCF). Simulations are carried out in order to evaluate the effect of soil variability on the track global stiffness, measured at small speed. According to these simulations we observed that output’s variability are much smaller than input’s one. Moreover, a global sensibility analysis based on the Fourier Amplitude Sensitivity Test (FAST) showed that around 80% of the output variance is due to the variance of the supporting soil. These results highlight the importance of taking into account natural soil spatial variability on railway track models.
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