Abstract
Under the effect of internal flows, a liner can undergo a washing out of particles, which modifies the particle size distribution and affects hydraulic, chemical and mechanical characteristics. This paper discusses the effects of internal flows on sand/kaolin mixture, in terms of rate of erosion and modification of the hydraulic conductivity. A parametric study is conducted with a specific device that consists of three modified triaxial cells. These cells allow isotropically consolidating and confining specimens, they prevent a parasitic flow and survey large deformations of specimen. The tests reveal that suffusion of clay is accompanied by a clogging in the specimen that induces a drop in hydraulic conductivity. For high gradients the erosion of clay is accompanied by the backward erosion of sand and finally the specimen collapses. The erosion rate then depends on the values of the different parameters considered (hydraulic gradient, clay content and filter pore opening size).
Highlights
To cite this version: Didier Marot, Fateh Bendahmane, Frédéric Rosquoët, Alain Alexis
This paper discusses the effects of internal flows on sand/kaolin mixture, in terms of rate of erosion and modification of the hydraulic conductivity
The present paper reports a study conducted at the Institut de Recherche en Genie Civil et Mecanique (GeM, Saint-Nazaire, France) to provide new data on the effects of internal erosion on sand/clay specimens
Summary
To cite this version: Didier Marot, Fateh Bendahmane, Frédéric Rosquoët, Alain Alexis. Internal Flow Effects on Isotropic Confined Sand-Clay Mixtures. This paper discusses the effects of internal flows on sand/kaolin mixture, in terms of rate of erosion and modification of the hydraulic conductivity. A parametric study is conducted with a specific device that consists of three modified triaxial cells These cells allow isotropically consolidating and confining specimens, they prevent a parasitic flow and survey large deformations of specimen. The tests reveal that suffusion of clay is accompanied by a clogging in the specimen that induces a drop in hydraulic conductivity. The erosion rate depends on the values of the different parameters considered (hydraulic gradient, clay content and filter pore opening size). Suffusion is characterized by an internal redistribution of the fine particles within the soil and can be accompanied by the decrease of the conductivity. On the other hand, is induced by a backward erosion of particles from the soil downstream and along the upstream line towards an outside environment until forming
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