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Macro and Micro Analysis for Grading-Dependent Mechanical Behavior of Granular Materials

Liu, Y. J. / Yin, Z. Y. / Hicher, P. Y. / Wang, J. H. / Xia, X. H.

Influence of grading on the stress-strain and critical state behavior of granular materials is investigated by employing the three-dimensional discrete-element method (3D-DEM) through conventional drained triaxial tests in compression and extension. It is found that, under the same initial conditions (same e₀, p'₀), samples with a wider particle distribution exhibit more contractive. For each grading, a unique critical state line is achieved under different stress levels. The results from different gradings highlight that the critical state of the granular samples are significantly affected by the grading: the critical state line shifts down as the coefficient of uniformity (C_u) increases. A relationship between the location of CSL and the grading index C_u is then established. Micromechanical analyses are finally performed to confirm the macro finding of the grading dependency of mechanical behavior of granular materials.

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Macro and Micro Analysis for Grading-Dependent Mechanical Behavior of Granular Materials

Liu, Y. J. / Yin, Z. Y. / Hicher, P. Y. / Wang, J. H. / Xia, X. H.

Influence of grading on the stress-strain and critical state behavior of granular materials is investigated by employing the three-dimensional discrete-element method (3D-DEM) through conventional drained triaxial tests in compression and extension. It is found that, under the same initial conditions (same e₀, p'₀), samples with a wider particle distribution exhibit more contractive. For each grading, a unique critical state line is achieved under different stress levels. The results from different gradings highlight that the critical state of the granular samples are significantly affected by the grading: the critical state line shifts down as the coefficient of uniformity (C_u) increases. A relationship between the location of CSL and the grading index C_u is then established. Micromechanical analyses are finally performed to confirm the macro finding of the grading dependency of mechanical behavior of granular materials.

Macro and Micro Analysis for Grading-Dependent Mechanical Behavior of Granular Materials

Liu, Y. J. / Yin, Z. Y. / Hicher, P. Y. / Wang, J. H. / Xia, X. H.

Influence of grading on the stress-strain and critical state behavior of granular materials is investigated by employing the three-dimensional discrete-element method (3D-DEM) through conventional drained triaxial tests in compression and extension. It is found that, under the same initial conditions (same e₀, p'₀), samples with a wider particle distribution exhibit more contractive. For each grading, a unique critical state line is achieved under different stress levels. The results from different gradings highlight that the critical state of the granular samples are significantly affected by the grading: the critical state line shifts down as the coefficient of uniformity (C_u) increases. A relationship between the location of CSL and the grading index C_u is then established. Micromechanical analyses are finally performed to confirm the macro finding of the grading dependency of mechanical behavior of granular materials.

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Title:

Macro and Micro Analysis for Grading-Dependent Mechanical Behavior of Granular Materials

Contributors:

Liu, Y. J. (author) / Yin, Z. Y. (author) / Hicher, P. Y. (author) / Wang, J. H. (author) / Xia, X. H. (author)

Conference:

Fifth Biot Conference on Poromechanics ; 2013 ; Vienna, Austria

Published in:

Poromechanics V ; 1082-1089

Publication date:

2013-06-18

ISBN:

DOI:

https://doi.org/10.1061/9780784412992.129

Type of media:

Conference paper

Type of material:

Electronic Resource

Language:

English

Keywords:

Wave propagation , Poroelasticity , Mechanical properties , Soils , Mechanics , Granular media , Simulation , Porous media , Porosity

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