Influence of relative density on granular materials behavior: DEM simulations of triaxial tests |
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Authors: | Christophe Salot Philippe Gotteland Pascal Villard |
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Affiliation: | (1) Laboratoire 3S-R, UJF, CNRS, INP, UMR, Grenoble Universités, Grenoble, France |
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Abstract: | The rheological behavior of non-cohesive soils results from the arrangement and complex geometry of the grains. Numerical
models based on discrete element modeling provides an opportunity to understand these phenomena while considering the discrete
elements with a similar shape to that of the grains the soil is composed of. However, dealing with realistic shapes would
lead to a prohibitive calculation cost. In a macroscopic modeling approach, simplification of the discrete elements’ shape
can be done as long as the model can predict experimental results. Since the intrinsic non-convex geometry property of real
grains seems to play a major role on the response of the granular medium, it is thus possible to keep this geometrical feature
by using cluster of spherical discrete elements, which has the advantage to reduce dramatically the computation cost. Since
the porosities found experimentally could not always be obtained with the numerical model—owing to the huge difference in
shape, the notion of relative density, which requires a search for minimum and maximum porosities for the model, was chosen
to compare the experimental and numerical results. Comparing the numerical simulations with the experimental triaxial tests
conducted with relative densities and different confining pressures shows that the model is able to predict the experimental
results. |
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Keywords: | Granular materials Discrete element model Shape of elements Porosity Triaxial tests |
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