An experimentally validated DEM simulation of a monotonic triaxial test on railway ballast including the membrane boundary condition

Stefan Pantaleev, John P. Morrissey, Jin Y. Ooi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.
Original languageUndefined/Unknown
Title of host publicationProceedings of the 7th UK–China International Particle Technology Forum
EditorsJin Y. Ooi, Qingshan Zhu, Raffaella Ocone, Xianfeng Fan, J. P. Morrissey, Zeynep Karatza
Place of PublicationEdinburgh, UK
PublisherThe University of Edinburgh
Number of pages1
ISBN (Print)9781912669059
Publication statusPublished - 28 Jul 2019


  • DEM
  • Triaxial
  • Railway Ballast

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