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Study of scale effect in an internal erosion mechanism / Didier Marot in European journal of environmental and civil engineering, Vol. 16 N° 1 (Janvier 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 1 (Janvier 2012) . - pp. 1-19 Titre : Study of scale effect in an internal erosion mechanism : Centrifuge model and energy analysis Type de document : texte imprimé Auteurs : Didier Marot, Auteur ; Jacques Garnier, Auteur ; Luc Thorel, Auteur Année de publication : 2012 Article en page(s) : pp. 1-19 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Suffusion  Scale  effect  Centrifuge  bench  Erosion  model  Energy  analysis Résumé : Suffusion is an internal erosion mechanism, which means detachment and transport of fine particles within the soil skeleton due to hydraulic seepage flows. Different researchers have observed that the value of the critical hydraulic gradient required to initiate suffusion decreases with the length of the specimen tested. A specific centrifuge bench was designed to study the suffusion process and to study this scale effect under a controlled effective stress. Clayey sand specimens were subjected to centrifuge acceleration and to a downward flow under a constant hydraulic head. The study underlines the influence of specimen length on critical hydraulic gradient and also on the rate of erosion. A new energy analysis of tests is developed, linking the erosion rate to the power expended by fluid flow, and the eroded clay mass to the energy dissipation. This method permits the effect of specimen length to be avoided. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667203 [article] Study of scale effect in an internal erosion mechanism : Centrifuge model and energy analysis [texte imprimé] / Didier Marot, Auteur ; Jacques Garnier, Auteur ; Luc Thorel, Auteur . - 2012 . - pp. 1-19. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 1 (Janvier 2012) . - pp. 1-19 Mots-clés : Suffusion  Scale  effect  Centrifuge  bench  Erosion  model  Energy  analysis Résumé : Suffusion is an internal erosion mechanism, which means detachment and transport of fine particles within the soil skeleton due to hydraulic seepage flows. Different researchers have observed that the value of the critical hydraulic gradient required to initiate suffusion decreases with the length of the specimen tested. A specific centrifuge bench was designed to study the suffusion process and to study this scale effect under a controlled effective stress. Clayey sand specimens were subjected to centrifuge acceleration and to a downward flow under a constant hydraulic head. The study underlines the influence of specimen length on critical hydraulic gradient and also on the rate of erosion. A new energy analysis of tests is developed, linking the erosion rate to the power expended by fluid flow, and the eroded clay mass to the energy dissipation. This method permits the effect of specimen length to be avoided. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667203