Force d'impact d'une avalanche granulaire sur un mur rigide: solution analytique contre simulations discrètes

International audienceThe present paper investigates the mean impact force exerted by a granular mass flowing down an incline and impacting a rigid wall of semi-infinite height. First, this granular flow-wall interaction problem is modeled by numerical simulations based on the discrete element method (DEM). These DEM simulations allow computing the depth-averaged quantitie

Force d'impact d'un écoulement granulaire contre un obstacle par modélisation discrète

5th Interdisciplinary Workshop on Rockfall Protection RocExs 2014, Lecco, ITA, 29-/05/2014 - 31/05/2014International audienceThis paper presents a numerical study for evaluating the impact force of dry granular flow against a rigid wall. The granular material was modeled using poly-dispersed clumps where each clump consisted of two overlapping spherical particles accounting for the shape effects of gravel particles. The particles were flowing in an inclined flume where different inclination angles were tested and interaction forces with the wall were recorded at different heights. Compared with the experimental results, the model showed good agreement regarding the peak impact force, the time of the peak force and the final (residual) force at the end of the tests

Relation entre microstructure et chargement appliqué par un écoulement granulaire sur un mur rigide par modélisation MED

International audienceThis paper presents a numerical model based on Discrete Element Method used to reproduce a series of tests of dry granular flow impacting a rigid wall. The flow was composed of poly-dispersed non-spherical particles flowing in an inclined chute with different inclination angles. The model has been calibrated based on the flow thickness measurements and the shape of the flowing particles (a single sphere and a clump). Quantitative comparison with experimental data showed good agreement in terms of peak impact force on the wall, the time of the peak and also the residual force values at the end of the tests. After validating the model, relation between microstructure and the normal impact force against the wall was investigated, by comparing the variation of impact force values along the height of the wall for different tests. Microstructural heterogeneities were observed in the impacting and depositing stages of the flow, indicating the presence of arching effect in the granular medium behind the wall

Force d'impact d'un écoulement granulaire contre un obstacle par modélisation discrète

5th Interdisciplinary Workshop on Rockfall Protection RocExs 2014, Lecco, ITA, 29-/05/2014 - 31/05/2014International audienceThis paper presents a numerical study for evaluating the impact force of dry granular flow against a rigid wall. The granular material was modeled using poly-dispersed clumps where each clump consisted of two overlapping spherical particles accounting for the shape effects of gravel particles. The particles were flowing in an inclined flume where different inclination angles were tested and interaction forces with the wall were recorded at different heights. Compared with the experimental results, the model showed good agreement regarding the peak impact force, the time of the peak force and the final (residual) force at the end of the tests