Numerical modelling of railway ballast at the particle scale
| Autor: | Sharif Ahmed, William Powrie, Antonis Zervos, Louis Le Pen, John Harkness |
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| Rok vydání: | 2015 |
| Předmět: |
Ballast
Engineering Particle number business.industry 0211 other engineering and technologies Computational Mechanics Stiffness 02 engineering and technology Structural engineering Strain rate Physics::Classical Physics Geotechnical Engineering and Engineering Geology Discrete element method Mechanics of Materials 021105 building & construction Particle-size distribution medicine Particle General Materials Science medicine.symptom business 021101 geological & geomatics engineering Parametric statistics |
| Zdroj: | International Journal for Numerical and Analytical Methods in Geomechanics. 40:713-737 |
| ISSN: | 0363-9061 |
| DOI: | 10.1002/nag.2424 |
| Popis: | The paper describes the development of a technique to simulate triaxial tests on specimens of railway ballast numerically at the particle scale and its validation with reference to physical test data. The ballast particles were modelled using potential particles and the well-known discrete element method. The shapes of these elemental particles, the particle size distribution and the number of particles (N = 2800) in each numerical triaxial specimen all matched closely to the real ballast material being modelled. Confining pressures were applied to the specimen via a dynamic triangulation of the outer particle centroids. A parametric study was carried out to investigate the effects on the simulation of timestep, strain rate, damping, contact stiffness and inter-particle friction. Finally, a set of parameters was selected that provided the best fit to experimental tri- axial data, with very close agreement of mobilized friction and volumetric strain behaviour. |
| Databáze: | OpenAIRE |
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