ANISOTROPY IN GRANULAR GEOMATERIALS

Marjan Oboudi, Stan Pietruszczak

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Soil Mechanics II / Mécanique des sols II

ABSTRACT: The primary objective of this study is to demonstrate that a significant degree of anisotropy may occur in particulate materials that have nearly spherical aggregates (i.e. are typically considered as isotropic) provided there is a bias in the distribution of pore space due to the initial densification process. The study includes both an experimental and theoretical component. An experimental program is conducted on dynamically compacted samples of Ottawa standard sand (C109), and incorporates a series of tests performed at different orientation of the specimens. Following the experimental part, a plasticity formulation based on the critical plane approach is presented for transversely isotropic granular media.

RÉSUMÉ: Cette étude a pour objectif principal de démontrer qu™un degré significatif d™anisotropie peut exister dans des matériaux pulvérulents composés d™agrégats quasi sphériques (généralement réputés isotropes), pourvu qu™il existe une distorsion dans la distribution de la porosité attribuable au processus de densification initiale. L™étude comporte un volet expérimental et un volet théorique. Le programme expérimental, ayant été mené sur des échantillons dynamiquement compactés de sable d™Ottawa de type C109, comprend des essais réalisés à diverses orientations des échantillons. À la suite de la partie expérimentale, une formulation de la plasticité fondée sur l™approche du plan critique est présentée pour les matériaux granulaires transversalement isotropes. Nous avons étudié les effets de l™anisotropie tant inhérente qu™induite.

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Cite this article:
Marjan Oboudi; Stan Pietruszczak (2015) ANISOTROPY IN GRANULAR GEOMATERIALS in GEO2015. Ottawa, Ontario: Canadian Geotechnical Society.

@article{351,author = Marjan Oboudi; Stan Pietruszczak,title = ANISOTROPY IN GRANULAR GEOMATERIALS,year = 2015}