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

Corrêa, Lúcio de Abreu; Cottereau, Régis; Bongini, Estelle; d’Aguiar, Sofia Costa; Faure, Baldrik; Voivret, Charles

doi:10.1007/978-3-319-54490-8_12

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…22 are so different is a clear demonstration that heterogeneity in the ballast should be taken into account. Indeed, the results obtained here can be shown to be much more compatible with actual observations made in the field [26] than previous models.…”

Section: Influence Of Heterogeneity Of the Ballast On The Wavefieldsupporting

confidence: 90%

Randomly-fluctuating heterogeneous continuum model of a ballasted railway track

Corrêa

Quezada²,

Cottereau

et al. 2017

Comput Mech

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This paper proposes a description of a granular medium as a stochastic heterogeneous continuum medium. The heterogeneity of the material properties field recreates the heterogeneous stress field in a granular medium. The stochastic approach means that only statistical information, easily available, is required to construct the model. The heterogeneous continuum model is calibrated with respect to discrete simulations of a set of railway ballast samples. As they are continuum-based, the equilibrium equations can be solved on a large scale using a parallel implementation of an explicit time discretization scheme for the Finite Element Method. Simulations representative of the influence on the environment of the passage of a train on a ballasted railway track clearly show the influence of the heterogeneity. These simulations seem to correlate well with previously unexplained overly damped measurements in the free field.

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Section: Influence Of Heterogeneity Of the Ballast On The Wavefieldsupporting

confidence: 90%

Randomly-fluctuating heterogeneous continuum model of a ballasted railway track

Corrêa

Quezada²,

Cottereau

et al. 2017

Comput Mech

Self Cite

View full text Add to dashboard Cite

show abstract

“…Then, we provide some [46,4], where waves should propagate non-dispersively with the velocity of a Rayleigh wave. In a setting including a homogeneous ballast layer, the situation would be more complex, and probably involve dispersive waves in the waveguide [46]. How-ever, the fact that part of the energy remains localized close to the source is a specific feature of the heterogeneous model of the ballast.…”

Section: Dynamic Behavior Of a Ballasted Railway Trackmentioning

confidence: 99%

Dispersion analysis in ballasted railway tracks and Anderson localization in granular media

Corrêa

Cottereau

Faure

2020

Journal of Sound and Vibration

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This paper analyzes the dynamic behavior of a randomly-heterogeneous continuum model of a ballasted railway track through the numerical construction of dispersion curves along the axis of the track. At intermediate frequencies (50-100 Hz), the dispersion curves display a strong decrease of the group velocity. At higher frequencies (above 100 Hz), the wave are strongly localized and cannot propagate along the track. This behavior is coherent with experimental observations reported in the literature on ballasted railway tracks and other granular media. Additional simulations are performed to prove that the localization is not a consequence of the geometry of the track or the impedance mismatch between the ballast and the underlying soil, but is indeed Anderson localization due to the heterogeneity of the ballast.

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

Cited by 2 publications

References 25 publications

Randomly-fluctuating heterogeneous continuum model of a ballasted railway track

Randomly-fluctuating heterogeneous continuum model of a ballasted railway track

Dispersion analysis in ballasted railway tracks and Anderson localization in granular media

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