Discrete Element Modeling of Aggregate Behavior in Fouled Railroad Ballast
Publication: Recent Advancement in Soil Behavior, in Situ Test Methods, Pile Foundations, and Tunneling: Selected Papers from the 2009 GeoHunan International Conference
Abstract
This paper describes an aggregate imaging based Discrete Element Modeling (DEM) methodology successfully employed to model both clean and coal dust fouled railroad ballast behavior. Laboratory direct shear box tests were conducted on granite type clean and fouled ballast aggregate samples. The size, shape and angularity properties of the aggregate particles were obtained through image analysis. Accordingly, direct shear box DEM simulations were conducted for different aggregate contact friction conditions. Both the clean ballast behavior and the heavily fouled case of coal dust filling completely all the voids in ballast were adequately modeled using the DEM approach by assigning a lower contact friction angle as the controlling discrete element model parameter in the latter case. In accordance with the direct shear test results, much lower shear stress-shear deformation curves, i.e., lower shear strengths, were predicted the coal dust fouled case using the DEM simulations.
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Copyright
© 2009 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Aggregates
- Discrete element method
- Engineering fundamentals
- Environmental engineering
- Infrastructure
- Laboratory tests
- Material mechanics
- Material properties
- Materials engineering
- Methodology (by type)
- Mine wastes
- Numerical methods
- Pavements
- Pollutants
- Rail transportation
- Railroad ballast
- Railroad tracks
- Shear strength
- Shear stress
- Shear tests
- Strength of materials
- Stress (by type)
- Structural analysis
- Structural engineering
- Tests (by type)
- Transportation engineering
- Wastes
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