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Stress tensors for granular materials as non simple continua / Francesco Froiio in European journal of environmental and civil engineering, Vol. 14 N° 8-9 (Septembre 2010) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1167-1183 Titre : Stress tensors for granular materials as non simple continua Type de document : texte imprimé Auteurs : Francesco Froiio, Auteur ; Eleni Gerolymatou, Auteur Année de publication : 2011 Article en page(s) : pp. 1167-1183 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Granular  materials  Generalised  continuum  models  Stress  tensors  Averaging Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : We discuss the microstructural origin of stress tensors for granular materials in the context of "non simple" continuum models, of the micropolar and of the second-gradient type. Stress tensors are looked upon as generalised forces in the sense of analytical mechanics and we derive expressions that provide estimates of these quantities on the base of forces and couples exchanged between the grains in a Representative Elementary Volume (REV). DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Stress tensors for granular materials as non simple continua [texte imprimé] / Francesco Froiio, Auteur ; Eleni Gerolymatou, Auteur . - 2011 . - pp. 1167-1183. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1167-1183 Mots-clés : Granular  materials  Generalised  continuum  models  Stress  tensors  Averaging Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : We discuss the microstructural origin of stress tensors for granular materials in the context of "non simple" continuum models, of the micropolar and of the second-gradient type. Stress tensors are looked upon as generalised forces in the sense of analytical mechanics and we derive expressions that provide estimates of these quantities on the base of forces and couples exchanged between the grains in a Representative Elementary Volume (REV). DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

Thermoporomechanics of landslides / Sotirios Alevizos in European journal of environmental and civil engineering, Vol. 14 N° 8-9 (Septembre 2010) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1185-1198 Titre : Thermoporomechanics of landslides : A review of the Vaiont slide Type de document : texte imprimé Auteurs : Sotirios Alevizos, Auteur ; Eleni Gerolymatou, Auteur ; Emmanuil Veveakis, Auteur Année de publication : 2011 Article en page(s) : pp. 1185-1198 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Friction  Landslides  Irreversible  thermodynamics  Temperature Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The problem of creeping landslides accompanied by heat production due to friction on their base is studied here. The landslide is modelled using a rigid block that slides over a clayey zone of finite width and a thermal softening and velocity strengthening constitutive law for the friction coefficient of the basal clay material. As time progresses, the sliding process enters an irreversible, highly unstable procedure, when the heat dissipation at the base of the slide starts localizing towards an infinitesimally small shear band of the order of mm. The influence of this transition to the stability of the slide is explored by applying this model in the famous landslide of the Vaiont valley (Northern Italy). The model is calibrated upon the real velocity data of the slide verifying that the onset of the localization of dissipation is also a stability threshold for deep seated thermally driven landslides. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Thermoporomechanics of landslides : A review of the Vaiont slide [texte imprimé] / Sotirios Alevizos, Auteur ; Eleni Gerolymatou, Auteur ; Emmanuil Veveakis, Auteur . - 2011 . - pp. 1185-1198. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1185-1198 Mots-clés : Friction  Landslides  Irreversible  thermodynamics  Temperature Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The problem of creeping landslides accompanied by heat production due to friction on their base is studied here. The landslide is modelled using a rigid block that slides over a clayey zone of finite width and a thermal softening and velocity strengthening constitutive law for the friction coefficient of the basal clay material. As time progresses, the sliding process enters an irreversible, highly unstable procedure, when the heat dissipation at the base of the slide starts localizing towards an infinitesimally small shear band of the order of mm. The influence of this transition to the stability of the slide is explored by applying this model in the famous landslide of the Vaiont valley (Northern Italy). The model is calibrated upon the real velocity data of the slide verifying that the onset of the localization of dissipation is also a stability threshold for deep seated thermally driven landslides. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp