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A combined DEM-SBFEM for particle breakage modelling of rock-fill materials


Luo, T and Ooi, ET and Chan, AHC and Shao-jun, F, A combined DEM-SBFEM for particle breakage modelling of rock-fill materials, Rock and Soil Mechanics, 38, (5) pp. 1463-1471. ISSN 1000-7598 (2017) [Refereed Article]

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Copyright Chinese Academy of Sciences, Wuhan Institute of Rock and Soil Mechanics

DOI: doi:10.16285/j.rsm.2017.05.029


Both experimental and numerical studies show that particle breakage has significant influence on the macro mechanical response of granular soils. This study presents a novel computational method that combines two numerical techniques viz., the discrete element method (DEM) and the scaled boundary finite element method (SBFEM), with an aim to model the particle breakage phenomenon in granular soils. Individual grains in the soil are modelled by a single star-convex polygon having an arbitrary number of sides. The DEM, which is well-known for its ability in addressing problems involving the response of granular and discontinuous media, is used to determine the motion of- and interaction between the particles. At the end of each time step, the SBFEM is used to determine the stress state in the grains. As the SBFEM can be flexibly formulated on polygons with arbitrary number of sides, only a single polygon is required to replicate the morphology of each grain. This reduces the computational resources necessary for a stress analysis of each grain. The particle breakage condition is determined if the stress state in a polygon satisfies a mechanically driven criterion. Breakage is executed by splitting a polygon into two. The resulting new polygons are directly modelled by the SBFEM without any change to the formulation. The feasibility of the developed technique is demonstrated by a numerical benchmark.

Item Details

Item Type:Refereed Article
Keywords:rock-fill materials, discrete element method, scaled boundary finite element method, particle breakage, Hoek-Brown Criterion, biaxial test
Research Division:Engineering
Research Group:Civil engineering
Research Field:Civil geotechnical engineering
Objective Division:Construction
Objective Group:Construction design
Objective Field:Civil construction design
UTAS Author:Chan, AHC (Professor Andrew Chan)
ID Code:114956
Year Published:2017
Deposited By:Engineering
Deposited On:2017-03-03
Last Modified:2019-09-20

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