Computer-vision based 3D discrete element modeling of railroad ballast

W. Li, X. C. Bian, E. Tutumluer

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

Abstract

Ballast, an essential component of railroad track, is made up of particles with diverse size and shape. Particle shape plays a fairly important role in affecting ballast aggregates' mechanical behaviors, whereas conventional grading curve can hardly provide detailed information of ballast particle shape. A computer-vision based discrete element modeling approach characterized by using 3D polyhedron elements to represent realistic ballast particles, is introduced in this paper. Comparison between DEM simulations and laboratory direct shear tests demonstrates the reliability of this methodology. Discrete element simulations are carried out to further investigate angularity index, one of the most important shape indices, individual effects on aggregates' performance in mac no-and micro-scale. It is shown that aggregates consisting of more angular particles, owing to more significant interlocking which gives much reduced particle rotations and displacements, exhibit higher shear strength and resistance to deformation.

Original languageEnglish (US)
Title of host publicationRecent Advances in Environmental Vibration - Proceedings of 6th International Symposium on Environmental Vibration, ISEV 2013
EditorsGuangyun Gao, Yunmin Chen, E. Tutumluer
PublisherTongji University Press
Pages328-336
Number of pages9
ISBN (Electronic)9787560853031
StatePublished - Jan 1 2013
Event6th International Symposium on Environmental Vibration: Prediction, Monitoring, Mitigation and Evaluation, ISEV 2013 - Shanghai, China
Duration: Nov 8 2013Nov 10 2013

Publication series

NameRecent Advances in Environmental Vibration - Proceedings of 6th International Symposium on Environmental Vibration, ISEV 2013

Other

Other6th International Symposium on Environmental Vibration: Prediction, Monitoring, Mitigation and Evaluation, ISEV 2013
CountryChina
CityShanghai
Period11/8/1311/10/13

Keywords

  • Direct shear test
  • Discrete element method
  • Interlocking effect
  • Shape characteristics

ASJC Scopus subject areas

  • Mechanics of Materials
  • Management, Monitoring, Policy and Law
  • Safety, Risk, Reliability and Quality
  • Environmental Engineering

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