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Combined Discrete-Continuum Analysis for Ballasted Rail Tracks

Ngo, T. / Indraratna, Buddhima / Rujikiatkamjorn, C.

A study on the load-deformation behaviour of railway ballast aggregates subjected to cyclic loadings using a combined discrete-continuum modelling approach is presented. Discrete ballast particles are simulated in the DEM and the continuum-based subgrade is simulated by the FDM. Interface elements are generated to transmit contact forces and displacements between the two domains (i.e. discrete and continuum) whereby the DEM exchanges contact forces to the FDM, and then the FDM transfers the displacement back to the DEM. Distributions of contact forces, coordination number, stress contours on the subgrade and corresponding number of broken bonds (representing ballast breakage) are analysed.

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Combined Discrete-Continuum Analysis for Ballasted Rail Tracks

Ngo, T. / Indraratna, Buddhima / Rujikiatkamjorn, C.

A study on the load-deformation behaviour of railway ballast aggregates subjected to cyclic loadings using a combined discrete-continuum modelling approach is presented. Discrete ballast particles are simulated in the DEM and the continuum-based subgrade is simulated by the FDM. Interface elements are generated to transmit contact forces and displacements between the two domains (i.e. discrete and continuum) whereby the DEM exchanges contact forces to the FDM, and then the FDM transfers the displacement back to the DEM. Distributions of contact forces, coordination number, stress contours on the subgrade and corresponding number of broken bonds (representing ballast breakage) are analysed.

Combined Discrete-Continuum Analysis for Ballasted Rail Tracks

Ngo, T. / Indraratna, Buddhima / Rujikiatkamjorn, C.

A study on the load-deformation behaviour of railway ballast aggregates subjected to cyclic loadings using a combined discrete-continuum modelling approach is presented. Discrete ballast particles are simulated in the DEM and the continuum-based subgrade is simulated by the FDM. Interface elements are generated to transmit contact forces and displacements between the two domains (i.e. discrete and continuum) whereby the DEM exchanges contact forces to the FDM, and then the FDM transfers the displacement back to the DEM. Distributions of contact forces, coordination number, stress contours on the subgrade and corresponding number of broken bonds (representing ballast breakage) are analysed.

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Title:

Combined Discrete-Continuum Analysis for Ballasted Rail Tracks

Additional title:

Lecture Notes in Civil Engineering

Contributors:

Barla, Marco (editor) / Di Donna, Alice (editor) / Sterpi, Donatella (editor) / Ngo, T. (author) / Indraratna, Buddhima (author) / Rujikiatkamjorn, C. (author)

Conference:

International Conference of the International Association for Computer Methods and Advances in Geomechanics ; 2021 ; Turin, Italy

Published in:

Challenges and Innovations in Geomechanics ; Chapter: 32 ; 266-273

Lecture Notes in Civil Engineering ; 126

Publication date:

2021-01-15

Size:

8 pages

ISBN:

978-3-030-64518-2 , 978-3-030-64517-5

ISSN:

2366-2565 , 2366-2557

DOI:

https://doi.org/10.1007/978-3-030-64518-2_32

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Ballast , Breakage , Rail track , DEM , Coupled DEM-FDM Engineering , Geoengineering, Foundations, Hydraulics , Geotechnical Engineering & Applied Earth Sciences , Engineering Mathematics , Offshore Engineering

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