Impact of Ballast Fouling on the Mechanical Properties of Railway Ballast: Insights from Discrete Element Analysis
Ballast fouling is a major factor that contributes to the reduction of shear strength of railway ballast, which can further affect the stability of railway supporting structure. The major sources of ballast fouling include infiltration of foreign fines into the ballast material and ballast degradati...
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doaj-6ad636a9aa704f83b86c1ae0cf0d2b1f2021-08-26T14:16:05ZengMDPI AGProcesses2227-97172021-07-0191331133110.3390/pr9081331Impact of Ballast Fouling on the Mechanical Properties of Railway Ballast: Insights from Discrete Element AnalysisLuyu Wang0Mohamed Meguid1Hani S. Mitri2Department of Civil Engineering, McGill University, Montreal, QC H3A 0C3, CanadaDepartment of Civil Engineering, McGill University, Montreal, QC H3A 0C3, CanadaDepartment of Mining and Materials Engineering, McGill University, Montreal, QC H3A 0E8, CanadaBallast fouling is a major factor that contributes to the reduction of shear strength of railway ballast, which can further affect the stability of railway supporting structure. The major sources of ballast fouling include infiltration of foreign fines into the ballast material and ballast degradation induced by train movement on the supported tracks. In this paper, a discrete element model is developed and used to simulate the shear stress–strain response of fouled ballast assembly subjected to direct shear loading. A simplified computational approach is then proposed to model the induced ballast fouling and capture the mechanical response of the ballast at various levels of contamination. The approach is based on the assumption that fine particles comprising the fouling material will not only change the interparticle friction angle, but also the contact stiffness between the ballast particles. Therefore, both the interparticle friction coefficient and effective modulus are adjusted based on a fouled ballast model that is validated using experimental results. The effect of ballast degradation is also investigated by gradually changing the particle size distribution of the ballast assembly in the discrete element model to account for the increased range of particle sizes. Using the developed model, the effect of ballast degradation on the shear strength is then evaluated. Conclusions are made to highlight the suitability of these approximate approaches in efficiently modeling ballast assemblies under shear loading conditions.https://www.mdpi.com/2227-9717/9/8/1331railway ballast foulingballast degradationmicro-mechanical parametersshear strength |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Luyu Wang Mohamed Meguid Hani S. Mitri |
spellingShingle |
Luyu Wang Mohamed Meguid Hani S. Mitri Impact of Ballast Fouling on the Mechanical Properties of Railway Ballast: Insights from Discrete Element Analysis Processes railway ballast fouling ballast degradation micro-mechanical parameters shear strength |
author_facet |
Luyu Wang Mohamed Meguid Hani S. Mitri |
author_sort |
Luyu Wang |
title |
Impact of Ballast Fouling on the Mechanical Properties of Railway Ballast: Insights from Discrete Element Analysis |
title_short |
Impact of Ballast Fouling on the Mechanical Properties of Railway Ballast: Insights from Discrete Element Analysis |
title_full |
Impact of Ballast Fouling on the Mechanical Properties of Railway Ballast: Insights from Discrete Element Analysis |
title_fullStr |
Impact of Ballast Fouling on the Mechanical Properties of Railway Ballast: Insights from Discrete Element Analysis |
title_full_unstemmed |
Impact of Ballast Fouling on the Mechanical Properties of Railway Ballast: Insights from Discrete Element Analysis |
title_sort |
impact of ballast fouling on the mechanical properties of railway ballast: insights from discrete element analysis |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2021-07-01 |
description |
Ballast fouling is a major factor that contributes to the reduction of shear strength of railway ballast, which can further affect the stability of railway supporting structure. The major sources of ballast fouling include infiltration of foreign fines into the ballast material and ballast degradation induced by train movement on the supported tracks. In this paper, a discrete element model is developed and used to simulate the shear stress–strain response of fouled ballast assembly subjected to direct shear loading. A simplified computational approach is then proposed to model the induced ballast fouling and capture the mechanical response of the ballast at various levels of contamination. The approach is based on the assumption that fine particles comprising the fouling material will not only change the interparticle friction angle, but also the contact stiffness between the ballast particles. Therefore, both the interparticle friction coefficient and effective modulus are adjusted based on a fouled ballast model that is validated using experimental results. The effect of ballast degradation is also investigated by gradually changing the particle size distribution of the ballast assembly in the discrete element model to account for the increased range of particle sizes. Using the developed model, the effect of ballast degradation on the shear strength is then evaluated. Conclusions are made to highlight the suitability of these approximate approaches in efficiently modeling ballast assemblies under shear loading conditions. |
topic |
railway ballast fouling ballast degradation micro-mechanical parameters shear strength |
url |
https://www.mdpi.com/2227-9717/9/8/1331 |
work_keys_str_mv |
AT luyuwang impactofballastfoulingonthemechanicalpropertiesofrailwayballastinsightsfromdiscreteelementanalysis AT mohamedmeguid impactofballastfoulingonthemechanicalpropertiesofrailwayballastinsightsfromdiscreteelementanalysis AT hanismitri impactofballastfoulingonthemechanicalpropertiesofrailwayballastinsightsfromdiscreteelementanalysis |
_version_ |
1721190386658967552 |