Complementary wave-based characterizations of sedimentation processes / Yu-Hsing Wang in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°1 (Janvier 2008)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 134 N°1 (Janvier 2008) . - pp. 47–56 Titre : Complementary wave-based characterizations of sedimentation processes Type de document : texte imprimé Auteurs : Yu-Hsing Wang, Auteur ; Xiaobo Dong, Auteur Année de publication : 2008 Article en page(s) : pp. 47–56 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Shear waves Clays Anisotropy Sedimentation Fabrics Résumé : In this paper, the sedimentation behavior of two kaolinite samples with distinct fabric associations is characterized using mechanical and electromagnetic wave-based techniques. The two different fabric formations, the edge-to-face (EF) flocculated structure (i.e., Sample A) and the dispersed and deflocculated structure (i.e., Sample B), were produced by changing the pH of the pore fluid. The anisotropy of the shear-wave velocity and DC conductivity was not observed in the sediment of Sample A because of EF isotropic fabric associations, but it was detected in Sample B as a result of face-to-face aggregation. An open card-house structure of the Sample A sediment results in a higher relaxation strength of the bulk water, Δκw owing to a higher water content; the smaller Δκw measured in the Sample B sediment indicates denser packing. In both samples, sediment consolidation gives rise to a decrease in the bulk-water relaxation strength, but an increase in the bound-water relaxation strength owing to increasing particle content. During sediment consolidation, the sediment conductivity of Sample A continuously decreases because of the reduced contribution from the fluid conductivity. In Sample B, the surface conduction overcompensates such a decreased contribution so that the sediment conductivity increases with increasing particle content. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A1%2847 [...] [article] Complementary wave-based characterizations of sedimentation processes [texte imprimé] / Yu-Hsing Wang, Auteur ; Xiaobo Dong, Auteur . - 2008 . - pp. 47–56. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°1 (Janvier 2008) . - pp. 47–56 Mots-clés : Shear waves Clays Anisotropy Sedimentation Fabrics Résumé : In this paper, the sedimentation behavior of two kaolinite samples with distinct fabric associations is characterized using mechanical and electromagnetic wave-based techniques. The two different fabric formations, the edge-to-face (EF) flocculated structure (i.e., Sample A) and the dispersed and deflocculated structure (i.e., Sample B), were produced by changing the pH of the pore fluid. The anisotropy of the shear-wave velocity and DC conductivity was not observed in the sediment of Sample A because of EF isotropic fabric associations, but it was detected in Sample B as a result of face-to-face aggregation. An open card-house structure of the Sample A sediment results in a higher relaxation strength of the bulk water, Δκw owing to a higher water content; the smaller Δκw measured in the Sample B sediment indicates denser packing. In both samples, sediment consolidation gives rise to a decrease in the bulk-water relaxation strength, but an increase in the bound-water relaxation strength owing to increasing particle content. During sediment consolidation, the sediment conductivity of Sample A continuously decreases because of the reduced contribution from the fluid conductivity. In Sample B, the surface conduction overcompensates such a decreased contribution so that the sediment conductivity increases with increasing particle content. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A1%2847 [...]

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