Discrete element modelling of a monotonic triaxial test is carried out with the aim of studying the stress- strain response of railway ballast in a large-scale tester. The latex membrane of the tester is modelled via a lattice of bonded particles to investigate the effects of membrane stiffness on the stress-strain response. The confining pressure application through the membrane is achieved via individual forces applied to the membrane particles, giving rise to a uniform, radially inward, equivalent stress. This modelling approach leads to a close agreement with published experimental data. A coarse-graining analysis of the numerical results is performed to study the evolution of the stress state in the numerical sample.
|Title of host publication||Proceedings of the 7th UK–China International Particle Technology Forum|
|Editors||Jin Y. Ooi, Qingshan Zhu, Raffaella Ocone, Xianfeng Fan, J. P. Morrissey, Zeynep Karatza|
|Place of Publication||Edinburgh, UK|
|Publisher||The University of Edinburgh|
|Number of pages||1|
|Publication status||Published - 28 Jul 2019|
- Railway Ballast