Comptes Rendus
no. 2
Influence of the morphology of slope and blocks on the energy dissipations in a rock avalanche
[Influence de la morphologie de la pente et des blocs sur les modes de dissipation d'énergie dans une avalanche rocheuse]
Dominique Daudon1  ; Pascal Villard1  ; Vincent Richefeu1  ; Guilhem Mollon1
1 Université Grenoble-Alpes, 3SR Lab, 175, rue de la Passerelle, 38400 Saint-Martin-d'Hères, France
Comptes Rendus. Mécanique, Volume 343 (2015) no. 2, pp. 166-177.

Les modes de dissipations énergétiques lors de la propagation d'avalanches de roches sont étudiés à l'aide d'un modéle numérique aux éléments discrets. En utilisant des formes de blocs réalistes et une loi de contact spécifique permettant de prendre en considération les principaux phénomènes dissipatifs qui surviennent lors d'un impact, il nous a été possible d'analyser les différents modes de dissipation, par frottement et par chocs, qui se développent au sein du matériau granulaire ou à la base de l'écoulement. Il est montré que la forme des particules et la géométrie de la pente ont une influence majeure sur les modes de dissipation d'énergie et doivent être pris en compte dans les modèles numériques pour une meilleure prédiction de la propagation des avalanches rocheuses.

A discrete element model was used to determine the influence of block shape and surface topography on energy dissipative modes occurring during rockfalls or avalanches. By using realistic shapes of particles and a specific contact law able to represent the main dissipation phenomena at the contact-rebound point, we analyze the contribution of tangential and collisional effects within the granular material or at the base of the flow. It was shown that the particle shape and the slope geometry have a major influence on the energy dissipative modes and need to be accounted for in numerical models.

Reçu le :
Accepté le :
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DOI : 10.1016/j.crme.2014.11.003
Keywords: Rock avalanches, Discrete elements, Mechanical dissipation, Sensitivity study, Granular flows
Mot clés : Avalanches rocheuses, Éléments discrets, Dissipation mécanique, Étude de sensibilité, Écoulement granulaire
Dominique Daudon 1 ; Pascal Villard 1 ; Vincent Richefeu 1 ; Guilhem Mollon 1

1 Université Grenoble-Alpes, 3SR Lab, 175, rue de la Passerelle, 38400 Saint-Martin-d'Hères, France 
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Dominique Daudon; Pascal Villard; Vincent Richefeu; Guilhem Mollon. Influence of the morphology of slope and blocks on the energy dissipations in a rock avalanche. Comptes Rendus. Mécanique, Volume 343 (2015) no. 2, pp. 166-177. doi : 10.1016/j.crme.2014.11.003. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2014.11.003/

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