Computer-Vision Based 3D Discrete Element Modeling of Railroad Ballast
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 mechani cal 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.Compar ison 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 macro-and micro-scale.It is shown that aggregates consisting of more angular particles, owing to more signifi cant interlocking which gives much reduced particle rotations and displacements, exhibit higher shear strength and resistance to deformation.
shape characteristics discrete element method direct shear test interlocking effect
W.Li X.C.Bian E.Tutumluer
Institute of Geotechnical Engineering, MOE Key Laboratory of Soft Soils and Geoenvironmental Enginee Civil and Environmental Engineering Faculty, University of Illinois at Urbana-Champaign (UIUC), Urba
国际会议
第六届国际环境振动学术研讨会(6th International Symposium on Environmental Vibration)(ISEV2013)
上海
英文
328-336
2013-11-08（万方平台首次上网日期，不代表论文的发表时间）