Documents disponibles écrits par cet auteur

Drained cyclic behaviour of loose Dogs Bay sand / S. Lopez-Querol in Géotechnique, Vol. 62 N° 4 (Avril 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 4 (Avril 2012) . - pp. 281–289 Titre : Drained cyclic behaviour of loose Dogs Bay sand Type de document : texte imprimé Auteurs : S. Lopez-Querol, Auteur ; M. R. Coop, Auteur Année de publication : 2012 Article en page(s) : pp. 281–289 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Calcareous  soils  Compaction  Dynamics  Sands Résumé : The results of drained cyclic triaxial tests performed on Dogs Bay sand (a carbonate sand) are discussed in this paper. For this sand it has been previously demonstrated that the critical state exists and is unique. The relationship between volumetric strains due to cyclic loading and the critical state of this material under monotonic conditions is explored here. Drained cyclic tests on loose samples have been carried out, applying different amplitudes of cyclic loading for samples that generally have initial states on the wet side of critical. The trends of behaviour are summarised, pointing out the relationship between initial state parameter, amplitude of cyclic loading and final change in the state parameter at equilibrium. Experimental evidence is also given to demonstrate that the sand has a memory of the volumetric strain that has previously occurred when different patterns of cyclic loading are consecutively applied and equilibrium has not been reached. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/issue/geot/62/4# [article] Drained cyclic behaviour of loose Dogs Bay sand [texte imprimé] / S. Lopez-Querol, Auteur ; M. R. Coop, Auteur . - 2012 . - pp. 281–289. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 4 (Avril 2012) . - pp. 281–289 Mots-clés : Calcareous  soils  Compaction  Dynamics  Sands Résumé : The results of drained cyclic triaxial tests performed on Dogs Bay sand (a carbonate sand) are discussed in this paper. For this sand it has been previously demonstrated that the critical state exists and is unique. The relationship between volumetric strains due to cyclic loading and the critical state of this material under monotonic conditions is explored here. Drained cyclic tests on loose samples have been carried out, applying different amplitudes of cyclic loading for samples that generally have initial states on the wet side of critical. The trends of behaviour are summarised, pointing out the relationship between initial state parameter, amplitude of cyclic loading and final change in the state parameter at equilibrium. Experimental evidence is also given to demonstrate that the sand has a memory of the volumetric strain that has previously occurred when different patterns of cyclic loading are consecutively applied and equilibrium has not been reached. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/issue/geot/62/4#

Improved 1-D modelling in compound meandering channels with vegetated floodplains / Martin-Vide, J. P. in Journal of hydraulic research, Vol. 46 N°2 (2008) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 46 N°2 (2008) . - p. 265-276 Titre : Improved 1-D modelling in compound meandering channels with vegetated floodplains Titre original : Modélisation unidimensionnelle améliorée des cours d'eau à méandres avec des plaines d'inondation couvertes de végétation Type de document : texte imprimé Auteurs : Martin-Vide, J. P., Auteur ; P. J. M. Moreta, Auteur ; S. Lopez-Querol, Auteur Article en page(s) : p. 265-276 Note générale : Hydraulique Résumé en Français Langues : Anglais (eng) Mots-clés : Compound  channel  Foodplain  Meanders  Vegetation  1D-modelling Résumé : This paper shows that common open channel flow one-dimensional (1-D) numerical models behave poorly in terms of flow distribution across a section in a naturalized meandering channel with vegetated floodplains. We compared numerical models with new experiments carried out in a physical model on a reach of the Besòs river close to Barcelona that has been restored. The case examined has floodplains with thick vegetation, a low-flow meandering channel and high water depths over the main channel and floodplains. 1-D models overestimate velocities in the main channel but underestimate them on the floodplains. The paper gives a detailed description of an improved 1-D computation method based on the consideration of the total shear stress at the main channel-floodplain interface (the sum of turbulent friction plus lateral momentum transfer) on the one hand, and the influence of upstream velocity distribution with the help of two-dimensional numerical models on the other hand. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] Improved 1-D modelling in compound meandering channels with vegetated floodplains = Modélisation unidimensionnelle améliorée des cours d'eau à méandres avec des plaines d'inondation couvertes de végétation [texte imprimé] / Martin-Vide, J. P., Auteur ; P. J. M. Moreta, Auteur ; S. Lopez-Querol, Auteur . - p. 265-276. Hydraulique Résumé en Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 46 N°2 (2008) . - p. 265-276 Mots-clés : Compound  channel  Foodplain  Meanders  Vegetation  1D-modelling Résumé : This paper shows that common open channel flow one-dimensional (1-D) numerical models behave poorly in terms of flow distribution across a section in a naturalized meandering channel with vegetated floodplains. We compared numerical models with new experiments carried out in a physical model on a reach of the Besòs river close to Barcelona that has been restored. The case examined has floodplains with thick vegetation, a low-flow meandering channel and high water depths over the main channel and floodplains. 1-D models overestimate velocities in the main channel but underestimate them on the floodplains. The paper gives a detailed description of an improved 1-D computation method based on the consideration of the total shear stress at the main channel-floodplain interface (the sum of turbulent friction plus lateral momentum transfer) on the one hand, and the influence of upstream velocity distribution with the help of two-dimensional numerical models on the other hand. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com