Internal Flow Effects on Isotropic Confined Sand-Clay Mixtures
| Autor: | Alain Alexis, Frédéric Rosquoët, Didier Marot, Fateh Bendahmane |
|---|---|
| Přispěvatelé: | Institut de Recherche en Génie Civil et Mécanique (GeM), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-École Centrale de Nantes (ECN)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Materials science
Health Toxicology and Mutagenesis 0211 other engineering and technologies 0207 environmental engineering Soil Science rate of erosion 02 engineering and technology [SPI.MAT]Engineering Sciences [physics]/Materials Clogging Hydraulic head Hydraulic conductivity suffusion Environmental Chemistry Internal erosion Geotechnical engineering 020701 environmental engineering Backward erosion 021101 geological & geomatics engineering Internal flow sand-clay mixture [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph] Pollution 6. Clean water Particle-size distribution internal erosion Erosion Particle size hydraulic conductivity |
| Zdroj: | Soil and Sediment Contamination Soil and Sediment Contamination, TAYLOR & FRANCIS INC, 2009, 18 (3), pp.294-306. ⟨10.1080/15320380902799524⟩ |
| ISSN: | 1532-0383 |
| Popis: | International audience; 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). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|