Independence of shear strength with particle size dispersity still valid in polyhedral particle assemblies

Published on Jul 5, 2021in Epj Web of Conferences
· DOI :10.1051/EPJCONF/202124906009
Emilien Azéma21
Estimated H-index: 21
(University of Montpellier),
David Cantor2
Estimated H-index: 2
(École Polytechnique de Montréal)
Source
Abstract
References19
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This article presents an analysis of the shear strength of numerical samples composed of polyhedra presenting a grain size dispersion. Previous numerical studies using, for instance, disks, polygons, and spheres, have consistently shown that microstructural properties linked to the fabric and force transmission allow granular media to exhibit a constant shear resistance although packing fraction can dramatically change as a broader grain-size distribution is considered. To have a complete pictur...
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Abstract The Discrete Element Method (DEM) simulations are performed to investigate shear flows of polydispersed, cylindrical particles. Binary mixtures and Gaussian distribution mixtures are considered in the simulations to study the effect of polydispersity on the rheology and particle phase stresses. It is observed that no segregation occurs in the shear flows in the absence of gravity and interstitial fluid medium and the orientational alignment of a particle species in a mixture is affected...
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We examine the signatures of internal structure emerged from quasistatic shear responses of granular materials based on three-dimensional discrete element simulations. Granular assemblies consisting of spheres or nonspherical particles of different polydispersity are sheared from different initial densities and under different loading conditions (drained or undrained) steadily to reach the critical state (a state featured by constant stress and constant volume). The radial distribution function ...
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We use three-dimensional contact dynamics simulations to analyze the rheology of polydisperse packings of spherical particles subjected to simple shear. The macroscopic and microstructural properties of several packings are analyzed as a function of their size span (from nearly monodisperse to highly polydisperse). Consistently with previous two-dimensional simulations, we find that the shear strength is independent of the size span despite the increase of packing fraction with size polydispersi...
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Soil arching above support structures with different water tables may be different. A series of trapdoor tests are carried out to research the effect of water table on soil arch. Displacement of sands and soil pressure on trap door is obtained from test results and the influence of grain size and trap door width have also been considered in the model test. It can be concluded that the limit influenced range of water table on soil arching is two times width of trap door. When water table is less ...
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#2José Daniel Muñoz (National University of Colombia)H-Index: 11
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The force network ensemble is one of the most promising statistical descriptions of granular media, with an entropy accounting for all force configurations at mechanical equilibrium consistent with some external stress. It is possible to define a temperature-like parameter, the angoricity \(\alpha ^{-1}\), which under isotropic compression is a scalar variable. This ensemble is frequently studied on whole packings of grains; ho wever, previous works have shown that spatial correlations can be ne...
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#1Manuel Cárdenas-Barrantes (National University of Colombia)H-Index: 2
#2José Daniel Muñoz (National University of Colombia)H-Index: 11
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The force network ensemble is one of the most promising statistical descriptions of granular media, with an entropy accounting for all force configurations at mechanical equilibrium consistent with some external stress. It is possible to define a temperature-like parameter, the angoricity \(\alpha ^{-1}\), which under isotropic compression is a scalar variable. This ensemble is frequently studied on whole packings of grains; ho wever, previous works have shown that spatial correlations can be ne...
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#1Emilien Azéma (University of Montpellier)H-Index: 21
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By means of extensive contact dynamics simulations, we analyzed the effect of particle size distribution (PSD) on the strength and microstructure of sheared granular materials composed of frictional disks. The PSDs are built by means of a normalized β function, which allows the systematic investigation of the effects of both, the size span (from almost monodisperse to highly polydisperse) and the shape of the PSD (from linear to pronouncedly curved). We show that the shear strength is independen...
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#1Nicolas Estrada (University of Los Andes)H-Index: 13
Using discrete element methods, the effects of the grain size distribution on the density and the shear strength of frictionless disk packings are analyzed. Specifically, two recent findings on the relationship between the system's grain size distribution and its rheology are revisited, and their validity is tested across a broader range of distributions than what has been used in previous studies. First, the effects of the distribution on the solid fraction are explored. It is found that the di...
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By means of extensive contact dynamics simulations, we analyze the combined effects of polydispersity both in particle size and in particle shape, defined as the degree of shape irregularity, on the shear strength and microstructure of sheared granular materials composed of pentagonal particles. We find that the shear strength is independent of the size span, but unexpectedly, it declines with increasing shape polydispersity. At the same time, the solid fraction is an increasing function of both...
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