Influence of soil non linearity in the dynamic response of high speed railway track

Abstract eng:
The main objectives of the paper are to evaluate the relevance of the non-linear soil behavior on the track response and to validate the proposed methodology which includes these effects through an equivalent linear analysis. The proposed numerical model is based on 2.5D finite/infinite elements method that is coupled to an iterative procedure in order to fulfill the agreement between strain level and dynamic properties of the materials. To validate the model, the case study of Ledsgard is simulated, and the experimental and numerical results of displacements of the track are compared for several speeds of circulation of the train X2000. It is identified that the stiffness degradation, function of the strain level, plays a relevant role when dealing with high speed lines on soft ground. Moreover, the simulations developed with the proposed methodology reveal results very close to those observed, independently of the train speed, contrary to what was verified when the elastic linear model is used.

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