Non-Linear Behaviour of Geomaterials in Railway Tracks under Different Loading Conditions

André Paixão, José N. Varandas, Eduardo Fortunato, Rui Calçada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

The resilient behaviour of the geomaterials used in railway tracks, particularly the ballast layer, is mostly non-linear and depends mainly on the loading stress path. However geomaterials are frequently considered as linear elastic in structural analyses, assuming that it somewhat reproduces the results of non-linear models for a given load amplitude. This study focuses on whether this consideration is adequate to simulate not only the overall track behaviour, but also the response of the ballast layer, considering different loading conditions. The authors used three-dimensional train-track-soil system models, validated with experimental data, and the results of linear-elastic models are compared against non-linear models. Although the linear elastic models required significantly lower computational effort and can provide accurate estimates of the overall track response, they strongly underestimate the stress levels inside the ballast layer. This aspect can be an important hindrance to studies using linear-elastic models to analyse resilient and plastic deformations of the ballast layer in railway tracks.

Original languageEnglish
Title of host publicationADVANCES IN TRANSPORTATION GEOTECHNICS III
EditorsA. G. Correia
Place of PublicationAmsterdam, Netherlands
PublisherELSEVIER SCIENCE BV
Pages1128-1135
Number of pages8
DOIs
Publication statusPublished - 2016
Event3rd International Conference on Transportation Geotechnics (ICTG 2016) - Guimarães, Portugal
Duration: 4 Sep 20167 Sep 2016
Conference number: 3rd

Publication series

NameProcedia Engineering
PublisherElsevier Science B. V.
Volume143
ISSN (Print)1877-7058

Conference

Conference3rd International Conference on Transportation Geotechnics (ICTG 2016)
Abbreviated titleICTG 2016
CountryPortugal
CityGuimarães
Period4/09/167/09/16

Keywords

  • FEM modelling
  • K -θ model
  • non-linear constitutive laws
  • railway tracks
  • resilient modulus

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  • Cite this

    Paixão, A., Varandas, J. N., Fortunato, E., & Calçada, R. (2016). Non-Linear Behaviour of Geomaterials in Railway Tracks under Different Loading Conditions. In A. G. Correia (Ed.), ADVANCES IN TRANSPORTATION GEOTECHNICS III (pp. 1128-1135). (Procedia Engineering; Vol. 143). Amsterdam, Netherlands: ELSEVIER SCIENCE BV. https://doi.org/10.1016/j.proeng.2016.06.147