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 language | English |
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Title of host publication | ADVANCES IN TRANSPORTATION GEOTECHNICS III |
Editors | A. G. Correia |
Place of Publication | Amsterdam, Netherlands |
Publisher | ELSEVIER SCIENCE BV |
Pages | 1128-1135 |
Number of pages | 8 |
DOIs | |
Publication status | Published - 2016 |
Event | 3rd International Conference on Transportation Geotechnics (ICTG 2016) - Guimarães, Portugal Duration: 4 Sept 2016 → 7 Sept 2016 Conference number: 3rd |
Publication series
Name | Procedia Engineering |
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Publisher | Elsevier Science B. V. |
Volume | 143 |
ISSN (Print) | 1877-7058 |
Conference
Conference | 3rd International Conference on Transportation Geotechnics (ICTG 2016) |
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Abbreviated title | ICTG 2016 |
Country/Territory | Portugal |
City | Guimarães |
Period | 4/09/16 → 7/09/16 |
Keywords
- FEM modelling
- K -θ model
- non-linear constitutive laws
- railway tracks
- resilient modulus