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Microscopic Origins of Shear Strength in Packings Composed of Elongated Particles

  • E. AzémaEmail author
  • F. Radjaї
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG, volume 11)

Abstract

We investigate the rheology, force transmission and texture of granular materials composed of elongated particles by means of contact dynamics simulations. The particles have a rounded-cap rectangular (RCR) shape described by a single elongation parameter varying from 0 for a circular particle to 1 for an infinitely thin or long particle. We study the quasi-static behavior, structural and force anisotropies as a function of the elongation parameter for packings submitted to biaxial compression. The shear strength is found to increase linearly with this parameter whereas the solid fraction both at the initial isotropic state and in the critical state is nonmonotonous. We show that for these elongated particles a harmonic decomposition of the stress tensor provides a fairly good approximation of the internal state. Our data suggest that the increase of shear strength with reflects both enhanced friction mobilization and anisotropic particle orientation as the elongation of the particles increases.

Keywords

Elongated particles Fabric properties Force transmission Harmonic decomposition 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.LMGCCNRS – Université Montpellier 2Montpellier cedex 05France

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