Strength of non-spherical particles with anisotropic geometries under triaxial and shearing loading configurations

Galindo-Torres, S. A., Pedroso, D. M., Williams, D. J. and Muehlhaus, H. B. (2013) Strength of non-spherical particles with anisotropic geometries under triaxial and shearing loading configurations. Granular Matter, 15 5: 531-542. doi:10.1007/s10035-013-0428-6


Author Galindo-Torres, S. A.
Pedroso, D. M.
Williams, D. J.
Muehlhaus, H. B.
Title Strength of non-spherical particles with anisotropic geometries under triaxial and shearing loading configurations
Journal name Granular Matter   Check publisher's open access policy
ISSN 1434-5021
1434-7636
Publication date 2013-10-01
Year available 2013
Sub-type Article (original research)
DOI 10.1007/s10035-013-0428-6
Volume 15
Issue 5
Start page 531
End page 542
Total pages 12
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Formatted abstract
This paper presents a study on the macroscopic shear strength characteristics of granular assemblies with three- dimensional complex-shaped particles. Different assemblies are considered, with both isotropic and anisotropic particle geometries. The study is conducted using the discrete element method (DEM), with so-called sphero-polyhedral particles, and simulations of mechanical true triaxial tests for a range of Lode angles and confining pressures. The observed mathematical failure envelopes are investigated in the Haigh-Westergaard stress space, as well as on the deviatoric-mean pressure plane. It is verified that the DEM with non-spherical particles produces results that are qualitatively similar to experimental data and previous numerical results obtained with spherical elements. The simulations reproduce quite well the shear strength of assemblies of granular media, such as higher strength during compression than during extension. In contrast, by introducing anisotropy at the particle level, the shear strength parameters are greatly affected, and an isotropic failure criterion is no longer valid. It is observed that the strength of the anisotropic assembly depends on the direction of loading, as observed for real soils. Finally simulations on a virtual shearing test show how the velocity profile within the shear band is also affected by the grain's shape.
Keyword Complex shaped grains
Failure criteria
Discrete element method
Dense Granular Flows
Numerical-Simulation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
School of Civil Engineering Publications
Official 2014 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 10 times in Thomson Reuters Web of Science Article | Citations
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