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Étude de l'organisation des réarrangements d'un milieu granulaire sous sollicitations mécaniques

Abstract : The response to vibrations and the study of slope stability are a main topic in the study of granular media. On the one hand, these studies give information on the behavior of granular media submitted to these kind of sollicitations in nature (rockfalls, dune dynamics, earthquakes, ...) On the other hand, these studies allow a better understanding of granular matter in the framework of out of equilibrium systems like glassy systems. In a first part, we study experimentally the response of a granular medium to increasing inclination with acoustical and optical methods. The dynamics has two regimes: a regime with independent and localized small rearrangements and an intermittent regime with large events ("precursors") for inclination angles close to the angle of avalanche. The intermittent regime is constituted of collective motions of all grains at the surface of the packing. We point out the major role played by the microscopic details of the interaction between grains and by the boundary condition at the base of the packing during the inclination. The global dynamics of the system is characterized and compared with those obtained with a simple cellular automaton model. In a second part, we make a numerical study of the response of a vibrated granular medium. The system presents analogies with out of equilibrium systems (non-gaussian distributions of displacements, slowing down and heterogeneities of the dynamics, ...). We also discuss the influence of the rough bottom on the structure of the packing and on the dynamics. In particular, we observe that the bottom influences a volume whose thickness is about _ve grain diameters where heterogeneities and correlations appear.
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Contributor : Sébastien Kiesgen de Richter <>
Submitted on : Tuesday, March 9, 2010 - 2:56:04 PM
Last modification on : Tuesday, January 12, 2021 - 4:38:20 PM
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  • HAL Id : tel-00462390, version 1


Sébastien Kiesgen de Richter. Étude de l'organisation des réarrangements d'un milieu granulaire sous sollicitations mécaniques. Analyse de données, Statistiques et Probabilités []. Université Européenne de Bretagne, 2009. Français. ⟨tel-00462390⟩



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