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ANISOTROPY IN GRANULAR GEOMATERIALS
Session: Soil Mechanics II / Mécanique des sols II
Marjan Oboudi, Isherwood Associates (Canada)
Stan Pietruszczak, McMaster University (Canada)
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.
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