Effect of the grain elongation on the behaviour of granular materials in biaxial compression

Cécile Nouguier-Lehon

doi:10.1016/j.crme.2010.10.005

Effect of the grain elongation on the behaviour of granular materials in biaxial compression
[Influence de l'allongement des grains sur le comportement des matériaux granulaires au cours d'une compression biaxiale]

Cécile Nouguier-Lehon ¹

¹ Université de Lyon, École centrale de Lyon, LTDS UMR 5513, 36, avenue Guy-de-Collongue, 69134 Écully cedex, France

Comptes Rendus. Mécanique, Volume 338 (2010) no. 10-11, pp. 587-595.

Résumé
Abstract

Nous étudions dans cet article l'influence de l'allongement des grains sur le comportement de matériaux granulaires denses grâce à des simulations numériques 2D de l'essai de compression biaxiale par la méthode Contact Dynamics. Les grains sont de forme hexagonale (et de quatre élongations différentes) et leur comportement est comparé au cas des grains circulaires. Pour les formes étudiées, les échantillons de grains polygonaux sont initialement plus denses que l'échantillon de disques, et on observe une diminution de la densité initiale quand l'allongement des grains augmente. L'angle de frottement à l'état résiduel augmente linéairement avec l'allongement des particules. La rotation cumulée des disques est beaucoup plus importante que celle des polygones. Enfin, on peut remarquer que pour ces hexagones allongés, les grains qui tournent beaucoup sont situés le long de fines bandes car pour ces formes, les bandes de cisaillement sont plus fines et moins fluctuantes.

In this article we study the effect of the grain elongation on the shearing behaviour of dense granular materials by means of 2D numerical simulations of biaxial compression tests, using the Contact Dynamics method. The case of grains with hexagonal shapes (and four possible different elongations) is studied in comparison to the case of a sample with circular grains. For the shapes studied, samples with polygonal grains exhibit initial densities higher than the sample with discs, and the initial density decreases when the grain elongation increases. The friction angle at the residual state increases linearly with the particle elongation ratio. The cumulative rotations of discs are higher than those of polygons. Finally, in the case of elongated hexagons, the grains with highest rotations are located along thin bands because the shear bands are thinner and more persistent for these shapes.

Publié le : 2010-10-01

DOI : 10.1016/j.crme.2010.10.005

Keywords: Granular media, Particle shape, Biaxial test, Rotations
Mot clés : Milieux granulaires, Forme des particules, Essai biaxial, Rotations

Affiliations des auteurs :

Cécile Nouguier-Lehon ¹

¹ Université de Lyon, École centrale de Lyon, LTDS UMR 5513, 36, avenue Guy-de-Collongue, 69134 Écully cedex, France

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     author = {C\'ecile Nouguier-Lehon},
     title = {Effect of the grain elongation on the behaviour of granular materials in biaxial compression},
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Cécile Nouguier-Lehon. Effect of the grain elongation on the behaviour of granular materials in biaxial compression. Comptes Rendus. Mécanique, Volume 338 (2010) no. 10-11, pp. 587-595. doi : 10.1016/j.crme.2010.10.005. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2010.10.005/

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