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Comportement des matériaux granulaires sous vibration - Application au cas du ballast

Abstract : Granular materials are discrete solid particles which are large enough to avoid any thermal fluctuations. These materials are widely encountered especially in construction, transportation and pharmaceutical industries. The behavior of these materials is
generally out of the scope of the statistical and continuum mechanical approaches. In the first part of this thesis, we focus on the description of the discrete element model that we use, the effect of the simulation parameters on the sample quality and their
response under quasi-static axial loading. The second part is dedicated to the settlement of granular materials under periodic loading. An experimental study is conducted to investigate the effects of the physical factors on the settlement speed. These results are confronted and completed by numerical results based on the molecular dynamics. Moreover, the settlement mechanism, the effect of granular shape, the interaction and mode of confinement on
this phenomenon are described in details. At this level, we also introduced a computational method for the prediction of bed response under long term dynamic loading. The suggested approach uses
sequentially a molecular dynamics scheme, a time averaging technique, and a relaxation method in order to simulate long term granular materials settlement.
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Contributor : Ali Karrech Connect in order to contact the contributor
Submitted on : Tuesday, September 25, 2007 - 2:27:34 PM
Last modification on : Friday, September 30, 2022 - 4:09:52 AM
Long-term archiving on: : Thursday, April 8, 2010 - 8:00:13 PM


  • HAL Id : tel-00174829, version 1


Ali Karrech. Comportement des matériaux granulaires sous vibration - Application au cas du ballast. Matériaux. Ecole des Ponts ParisTech, 2007. Français. ⟨tel-00174829⟩



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