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Energy dissipation in nearly saturated poroviscoelastic soil columns during quasi-static compressional excitations / Tong Qiu in Journal of engineering mechanics, Vol. 138 N° 10 (Octobre 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 10 (Octobre 2012) . - pp.1263–1274. Titre : Energy dissipation in nearly saturated poroviscoelastic soil columns during quasi-static compressional excitations Type de document : texte imprimé Auteurs : Tong Qiu, Auteur ; Yanbo Huang, Auteur Année de publication : 2012 Article en page(s) : pp.1263–1274. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Compression  Coupling  Damping  Excitation  Relaxation  Saturated  soils  Vibration  Viscoelasticity Résumé : This paper presents a theoretical investigation on the energy dissipation in a nearly saturated poroviscoelastic soil column under quasi-static compressional excitations. Different components of the energy dissipation are evaluated and compared. The magnitude of fluid- induced energy dissipation is primarily a function of a normalized excitation frequency Ω. For small values of Ω, a drained soil column is fully relaxed and essentially behaves as a dry column with negligible pore pressure. For such a soil column, fluid-induced energy dissipation is negligible, and the total damping ratio of the column is essentially the same as that of the solid skeleton. For very high values of Ω, a drained soil column is fully loaded and the excitation-generated pore pressure decreases as the fluid becomes more compressible. For such a soil column, the fluid pressure gradient only exists in a thin boundary layer near the drainage boundary, where drainage occurs and fluid induces energy dissipation, whereas the rest of the column is essentially undrained. Significant fluid-induced energy dissipation occurs for moderate values of Ω because of a combination of moderate fluid pressure, pressure gradient, and fluid relative motion throughout the soil column. The effects of the boundary drainage condition, saturation, porosity, and skeleton damping ratio on fluid-induced energy dissipation are discussed. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000428 [article] Energy dissipation in nearly saturated poroviscoelastic soil columns during quasi-static compressional excitations [texte imprimé] / Tong Qiu, Auteur ; Yanbo Huang, Auteur . - 2012 . - pp.1263–1274. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 10 (Octobre 2012) . - pp.1263–1274. Mots-clés : Compression  Coupling  Damping  Excitation  Relaxation  Saturated  soils  Vibration  Viscoelasticity Résumé : This paper presents a theoretical investigation on the energy dissipation in a nearly saturated poroviscoelastic soil column under quasi-static compressional excitations. Different components of the energy dissipation are evaluated and compared. The magnitude of fluid- induced energy dissipation is primarily a function of a normalized excitation frequency Ω. For small values of Ω, a drained soil column is fully relaxed and essentially behaves as a dry column with negligible pore pressure. For such a soil column, fluid-induced energy dissipation is negligible, and the total damping ratio of the column is essentially the same as that of the solid skeleton. For very high values of Ω, a drained soil column is fully loaded and the excitation-generated pore pressure decreases as the fluid becomes more compressible. For such a soil column, the fluid pressure gradient only exists in a thin boundary layer near the drainage boundary, where drainage occurs and fluid induces energy dissipation, whereas the rest of the column is essentially undrained. Significant fluid-induced energy dissipation occurs for moderate values of Ω because of a combination of moderate fluid pressure, pressure gradient, and fluid relative motion throughout the soil column. The effects of the boundary drainage condition, saturation, porosity, and skeleton damping ratio on fluid-induced energy dissipation are discussed. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000428