The impact of debris flows on structures: practice revisited in light of new scientific results

l'impact des laves torrentielles sur des structures : la pratique revisitée à la lumière de résultats scientifiques nouveaux

Laigle, D. ; Labbé, M.

Type de document
Poster
Langue
Anglais
Affiliation de l'auteur
IRSTEA GRENOBLE UR ETGR FRA ; IRSTEA GRENOBLE UR ETGR FRA
Année
2016
Résumé / Abstract
The understanding and quantification of mudflow and debris flow – structure interactions in terms of modification of the incident flow and impact force applied to the obstacle are of paramount importance for the conception and design of structural countermeasures. In this context, the present study aims at determining local values of the flow velocity and pressure in the vicinity of a structure subjected to a debris-flow impact, as well as the changes in these variables over time and space, for a given incident flow. We use a 2D vertical numerical model based upon the SPH (smoothed particles hydrodynamics) numerical method. SPH is a particular method of treatment of fluid mechanics equations which is suitable for computing highly transitory free surface flows of complex fluids in complex geometries. Thus, it is suitable for the treatment of debris-flow waves – structure interactions. We present our numerical experiments setup aiming at simulating a viscoplastic fluid wave impacting a simple obstacle. We notably focus interest on the pressures developed on the structure during the impact, on their evolution with the incident flow features, and on their spatial distribution over the obstacle. We also analyze our results in terms of dynamic and gravity pressures.
Congrès
13ème congrès Interpraevent, 30/05/2016 - 02/06/2016, Lucerne, CHE

puce  Accés à la notice sur le site Irstea Publications / Display bibliographic record on Irstea Publications website

  Liste complète des notices de CemOA