@proceedings {354,
	title = {Microscopic Origins of Shear Strength in Packings Composed of Elongated Particles},
	journal = {9th International Workshop on Bifurcation and Degradation in Geomaterials (IWBDG 2011)},
	volume = {Springer Series in Geomechanics and Geoengineering - ADVANCES IN BIFURCATION AND DEGRADATION IN GEOMATERIALS},
	year = {2012},
	month = {Apr-11-2012},
	pages = {21-27},
	address = {MAY 23-26  2011 Porquerolles, FRANCE},
	abstract = {<p>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.</p>
},
	keywords = {Elongated particles, Fabric properties, force transmission, Harmonic decomposition},
	url = {https://hal.archives-ouvertes.fr/hal-00686728},
	author = {Emilien Az{\'e}ma and Farhang Radja{\"\i}},
	editor = {St{\'e}phane Bonelli and Dascalu, Cristian and Fran{\c c}ois Nicot}
}
@proceedings {353,
	title = {Onset of Immersed Granular Avalanches by DEM-LBM Approach},
	journal = {9th International Workshop on Buifurcation and Degradation in Geomaterials (IWBDG 2011)},
	volume = {Springer Series in Geomechanics and Geoengineering - ADVANCES IN BIFURCATION AND DEGRADATION IN GEOMATERIALS},
	year = {2011},
	month = {May-28-2011},
	pages = {109 - 115},
	publisher = {Springer Netherlands},
	address = {MAY 23-26  2011 Porquerolles, FRANCE},
	abstract = {<p>We present 3D grain-fluid simulations based on the discrete element method interfaced with the lattice Boltzmann method and applied to investigate the initiation of underwater granular flows. We prepare granular beds of 800 spherical grains with different values of the initial solid fraction in a biperiodic rectangular box. In order to trigger an avalanche, the bed is instantaneously tilted to a finite slope angle above the maximum angle of stability. We simulate the dynamics of the transient flow for different solid fractions. In agreement with the experimental work of Iverson (Water Resour Res 36(7):1897\&ndash;1910, 2000) and Pailha et\&nbsp;al. (Phys Fluids 20(11):111701, 2008), we find that the flow onset is controlled by the initial solid fraction.</p>
},
	isbn = {978-94-007-1420-5},
	issn = {1866-8755},
	doi = {10.1007/978-94-007-1421-210.1007/978-94-007-1421-2_14},
	author = {Jean-Yves Delenne and Mansouri, M. and Farhang Radja{\"\i} and Moulay Sa{\"\i}d El Youssoufi and Seridi, A.},
	editor = {St{\'e}phane Bonelli and Dascalu, Cristian and Fran{\c c}ois Nicot}
}
