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Grain Size Distribution Effects in 2D Discrete Numerical Experiments
The discrete element method (DEM) is becoming increasingly popular for the simulation and study of the mechanical response of granular materials. The narrow grain size distributions (GSD) used in most DEM studies are not necessarily representative of real soils, wherein grain sizes vary over several orders of magnitude. In the current study, biaxial compression tests on two-dimensional particulate assemblies are simulated and the results analyzed as a function of GSD. Four GSD's are simulated and material response is interpreted in terms of stress-strain-strength behavior at the macroscale and in terms of particle-level properties at the microscale. These types of studies may ultimately lead to a better fundamental understanding of the response of real soils with varying GSD's. Results of the simulations indicate that a coarser well-graded specimen has a higher shear strength than a finer well-graded specimen, consistent with a higher rate of dilation at peak for the coarser specimen. The more uniformly graded specimen is softer at low strains, requires a higher strain to peak, and is significantly more dilatant than the well-graded assemblies.
Grain Size Distribution Effects in 2D Discrete Numerical Experiments
The discrete element method (DEM) is becoming increasingly popular for the simulation and study of the mechanical response of granular materials. The narrow grain size distributions (GSD) used in most DEM studies are not necessarily representative of real soils, wherein grain sizes vary over several orders of magnitude. In the current study, biaxial compression tests on two-dimensional particulate assemblies are simulated and the results analyzed as a function of GSD. Four GSD's are simulated and material response is interpreted in terms of stress-strain-strength behavior at the macroscale and in terms of particle-level properties at the microscale. These types of studies may ultimately lead to a better fundamental understanding of the response of real soils with varying GSD's. Results of the simulations indicate that a coarser well-graded specimen has a higher shear strength than a finer well-graded specimen, consistent with a higher rate of dilation at peak for the coarser specimen. The more uniformly graded specimen is softer at low strains, requires a higher strain to peak, and is significantly more dilatant than the well-graded assemblies.
Grain Size Distribution Effects in 2D Discrete Numerical Experiments
Evans, T. Matthew (author) / Mojarrad, Hamed (author) / Cunningham, Charles (author) / Tayebali, Akhtar A. (author)
International Foundation Congress and Equipment Expo 2009 ; 2009 ; Orlando, Florida, United States
2009-03-10
Conference paper
Electronic Resource
English
Grain Size Distribution Effects in 2D Discrete Numerical Experiments
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