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2018 | OriginalPaper | Chapter

12. Impact of the Heterogeneity of the Ballast on the Dynamical Behavior of the Ballast-Soil System

Authors : Lucio De Abreu Correa, Regis Cottereau, Estelle Bongini, Sofia Costa d’Aguiar, Baldrik Faure, Charles Voivret

Published in: Computational Methods and Models for Transport

Publisher: Springer International Publishing

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Abstract

This paper discusses the dynamical behavior of a randomly-fluctuating heterogeneous continuum model of the ballast. The Young’s modulus is modeled as a random field parameterized by its average, its variance and a correlation model representing non-interpenetrating spheres. A numerical model of the ballast and the surrounding soil is then constructed based on an efficient implementation of an explicit spectral element solver on a large cluster of computers. This model allows to describe numerically the wave field generated in the ballast and soil by the passage of a train, as well as to construct dispersion equations for the ballast-soil model. The influence of heterogeneity is discussed by comparison with a similar model where the ballast is assumed homogeneous. Different values of the soil mechanical parameters are considered and compared. Finally, potential consequences for the design of the ballast are discussed.

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Title: Impact of the Heterogeneity of the Ballast on the Dynamical Behavior of the Ballast-Soil System
Authors: Lucio De Abreu Correa
Regis Cottereau
Estelle Bongini
Sofia Costa d’Aguiar
Baldrik Faure
Charles Voivret
Publisher: Springer International Publishing
Book: Computational Methods and Models for Transport
Print ISBN: 978-3-319-54489-2

Electronic ISBN: 978-3-319-54490-8

Copyright Year: 2018
DOI: https://doi.org/10.1007/978-3-319-54490-8_12

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