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Simulation of fresh and fouled ballast behavior using discrete element method

Conference Paper


Abstract


  • Ballasted rail track is commonly used worldwide for several reasons, including

    economy, rapid drainage and ease of maintenance. During operation, the ballast

    becomes contaminated or fouled due to infiltration of fines from surface, mud

    pumping from subgrade, and ballast degradation under train loading. This paper

    presents the application of a three-dimensional Discrete Element Method (DEM) in

    investigating the stress-strain and volumetric behaviour of fresh and 40%

    VCI-fouled ballast in direct shear testing. A ‘Clump logic’ in PFC3D was employed

    to model irregular-shaped particles in which groups of ten to twenty spherical balls

    were clumped in appropriate sizes and positions to model representative ballast

    particles. Fouled ballast was modeled by adding pre-determined amount of miniature

    spherical particles into the voids of fresh ballast. Results obtained from DEM

    simulation reasonably agree with those measured experimentally. The DEM simulation

    indicates that when ballast becomes fouled, the peak shear stress decreases

    and the dilation increases compared to fresh ballast. Additionally, the distribution

    of contact force chain apparently explains the ‘cushioning effect’ of coal fines that

    effectively reduced maximum contact forces and associated ballast degradation.

    Keywords: Ballast, Fouling, Coal fines, Discrete element method.

Publication Date


  • 2013

Citation


  • Rujikiatkamjorn, C., Ngo, N. Trung., Indraratna, B., Vinod, J. S. & Coop, M. (2013). Simulation of fresh and fouled ballast behavior using discrete element method. In B. Indraratna, C. Rujikiatkamjorn & J. J S. Vinod (Eds.), Proceedings of the International Conference on Ground Improvement and Ground Control (pp. 1585-1592). Singapore: Research Publishing.

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5283

Start Page


  • 1585

End Page


  • 1592

Place Of Publication


  • Singapore

Abstract


  • Ballasted rail track is commonly used worldwide for several reasons, including

    economy, rapid drainage and ease of maintenance. During operation, the ballast

    becomes contaminated or fouled due to infiltration of fines from surface, mud

    pumping from subgrade, and ballast degradation under train loading. This paper

    presents the application of a three-dimensional Discrete Element Method (DEM) in

    investigating the stress-strain and volumetric behaviour of fresh and 40%

    VCI-fouled ballast in direct shear testing. A ‘Clump logic’ in PFC3D was employed

    to model irregular-shaped particles in which groups of ten to twenty spherical balls

    were clumped in appropriate sizes and positions to model representative ballast

    particles. Fouled ballast was modeled by adding pre-determined amount of miniature

    spherical particles into the voids of fresh ballast. Results obtained from DEM

    simulation reasonably agree with those measured experimentally. The DEM simulation

    indicates that when ballast becomes fouled, the peak shear stress decreases

    and the dilation increases compared to fresh ballast. Additionally, the distribution

    of contact force chain apparently explains the ‘cushioning effect’ of coal fines that

    effectively reduced maximum contact forces and associated ballast degradation.

    Keywords: Ballast, Fouling, Coal fines, Discrete element method.

Publication Date


  • 2013

Citation


  • Rujikiatkamjorn, C., Ngo, N. Trung., Indraratna, B., Vinod, J. S. & Coop, M. (2013). Simulation of fresh and fouled ballast behavior using discrete element method. In B. Indraratna, C. Rujikiatkamjorn & J. J S. Vinod (Eds.), Proceedings of the International Conference on Ground Improvement and Ground Control (pp. 1585-1592). Singapore: Research Publishing.

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5283

Start Page


  • 1585

End Page


  • 1592

Place Of Publication


  • Singapore