We developed a 2D discrete element model to simulate shearing response of elongated round and angular particles. Model was calibrated and validated by comparing numerical results with corresponding biaxial shearing tests on circular (round) and hexagonal (angular) rods at microscopic and macroscopic scales. Then, the systematic effect of particles aspect ratio was investigated on quasi-static shearing response of round and angular granular materials. Macroscopically, we observed a nonlinear tendency wherein as the aspect ratio decreased from 1, the critical state stress ratio initially increased, reaching a maximum, followed by a decreasing trend. This effect was more prominent in round samples. Microscopically, decreasing the aspect ratio from 1 reduced particle rotations and increased the mean coordination number. Elongated particles exhibited significant contact anisotropy, forming irregular force chains, facilitating interparticle sliding, and reducing overall strength. Additionally, we explored the impact of the interparticle friction coefficient. A high value of interparticle friction coefficient led to a monotonically increasing strength with elongation, underscoring the importance of accurately calibrating microscopic friction coefficients.

Ali, U., Kikumoto, M., Ciantia, M. (2024). Impact of particle elongation on the behavior of round and angular granular media: Consequences of particle rotation and force chain development. COMPUTERS AND GEOTECHNICS, 165(January 2024) [10.1016/j.compgeo.2023.105858].

Impact of particle elongation on the behavior of round and angular granular media: Consequences of particle rotation and force chain development

Ciantia, M
2024

Abstract

We developed a 2D discrete element model to simulate shearing response of elongated round and angular particles. Model was calibrated and validated by comparing numerical results with corresponding biaxial shearing tests on circular (round) and hexagonal (angular) rods at microscopic and macroscopic scales. Then, the systematic effect of particles aspect ratio was investigated on quasi-static shearing response of round and angular granular materials. Macroscopically, we observed a nonlinear tendency wherein as the aspect ratio decreased from 1, the critical state stress ratio initially increased, reaching a maximum, followed by a decreasing trend. This effect was more prominent in round samples. Microscopically, decreasing the aspect ratio from 1 reduced particle rotations and increased the mean coordination number. Elongated particles exhibited significant contact anisotropy, forming irregular force chains, facilitating interparticle sliding, and reducing overall strength. Additionally, we explored the impact of the interparticle friction coefficient. A high value of interparticle friction coefficient led to a monotonically increasing strength with elongation, underscoring the importance of accurately calibrating microscopic friction coefficients.
Articolo in rivista - Articolo scientifico
Aspect ratio; Elongation; Force chain; Interparticle friction; Particle rotation; Shearing;
English
21-ott-2023
2024
165
January 2024
105858
reserved
Ali, U., Kikumoto, M., Ciantia, M. (2024). Impact of particle elongation on the behavior of round and angular granular media: Consequences of particle rotation and force chain development. COMPUTERS AND GEOTECHNICS, 165(January 2024) [10.1016/j.compgeo.2023.105858].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/444799
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