Numerical Study on the Effect of Particle Grading on the Triaxial Shear Response of an Idealized Granular Assemblage from Micro to Macro

Samaneh Amirpour Harehdasht

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: FUNDAMENTALS - V Soil & Rock Mechanics

ABSTRACT: Although dilation behavior of granular soils has been well examined as a function of their initial state and stress ratio, the proposed relationships has not been adequately examined to provide a clear insight into the effect of the particle characteristics (e.g. size and shape). In this paper, the effect of particle size distribution on empirical correlations (Bolton 1986, and Schanz and Vermeer 1996) is investigated through a series of triaxial laboratory tests on three different materials made up of rounded to angular particles. It has been demonstrated that, in the investigated range of 63 m<D50<1000 m, the maximum dilation rate cannot be described by a unique function of dilatancy index equation, and for a given material the coefficients a decreases with increasing D50. Based on triaxial test results, the parameter a at the well-on has been correlated with D50, and the resultant dilation rate values are validated through the comparison with dilation data from literature.

RÉSUMÉ: Malgré le fait que le comportement de dilatant des sols granulaires a été largement examiné en fonction de leur état initial de l'état des contraintes, les corrélations proposées dans la littérature ne semblent pas avoir considéré de manière adéquate l'effet des caractéristiques des particules (taille et la forme des grains par exemple). Dans le présent article, l'effet de la granulométrie et de la forme des particules sur les corrélations empiriques (Bolton 1986 et 1996 Schanz et (particules arrondis et angulaires). Il a été démontré que, dans la plage étudiée de 63 um <D50 <1000 um, le taux de pour un matériau donné les coefficients diminuent avec l'augmentation de la D50. Sur la base des résultats des essais triaxiaux, le paramètre a de l'équation de Bolton bien connue a été corrélée avec D50 et les valeurs de taux de dilatance résultants ont été validés par la comparaison avec les données collectées dans la littérature.

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Cite this article:
Samaneh Amirpour Harehdasht (2016) Numerical Study on the Effect of Particle Grading on the Triaxial Shear Response of an Idealized Granular Assemblage from Micro to Macro in GEO2016. Ottawa, Ontario: Canadian Geotechnical Society.

@article{4019_0722140156,author = Samaneh Amirpour Harehdasht,title = Numerical Study on the Effect of Particle Grading on the Triaxial Shear Response of an Idealized Granular Assemblage from Micro to Macro,year = 2016}