Why Modeling Particle Shape Matters: Significance of Particle-Scale Modeling in Describing Global and Local Granular Responses
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 150, Issue 9
Abstract
The applicability of particle-scale modeling using the discrete-element method (DEM) is typically evaluated by comparing simulation results with stress–strain responses observed in elementary tests. This validation at the global level may not guarantee that the simulation can capture realistic particle-level motion. Thus, this study investigated the applicability and limitation of two types of DEM models, through the comparison with experimental results of biaxial shearing tests on bidisperse granular assemblies comprising circular (round) and hexagonal (angular) particles under various confining pressures. Experimental data wherein particle rotations were identified by novel image analysis technique were used to evaluate whether the DEM models could accurately reproduce macroscopic stress–strain relationships and microscopic particle responses. Experimental findings suggested that particle rotations play a crucial role in granular deformation and are influenced by the particle shape. A detailed DEM model with precise particle shapes effectively replicated both macroscopic stress–strain relationships and microscopic responses, including particle rotation and interlocking at global and local levels. Conversely, a simpler ad hoc DEM model, which incorporates rolling resistance for circular particles, could imitate the stress–strain relationships of hexagonal particles but fell short in replicating microscopic responses accurately.
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Data Availability Statement
The data sets generated during and analyzed during the study are available from the corresponding author upon reasonable request.
Acknowledgments
The Ministry of Education, Culture, Sports, Science, and Technology of Japan is acknowledged for giving financial assistance through a MEXT scholarship to the first author to study at Yokohama National University, Japan. This work was funded by JSPS KAKENHI under Grant Nos. 24360192 and 19H00780 to the corresponding author. We also gratefully acknowledge the financial support from the Royal Society International Exchanges research grant (IES/R1/201238) for the second and third authors.
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© 2024 American Society of Civil Engineers.
History
Received: Oct 5, 2023
Accepted: Apr 11, 2024
Published online: Jul 4, 2024
Published in print: Sep 1, 2024
Discussion open until: Dec 4, 2024
ASCE Technical Topics:
- Comparative studies
- Continuum mechanics
- Discrete element method
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Granular materials
- Materials engineering
- Methodology (by type)
- Model accuracy
- Models (by type)
- Motion (dynamics)
- Numerical methods
- Particles
- Research methods (by type)
- Rotation
- Simulation models
- Solid mechanics
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