Documents disponibles écrits par cet auteur

Large-displacement interface shear between steel and granular media / T. Y. K. Ho in Géotechnique, Vol. 61 N° 3 (Mars 2011) 

Public ISBD [article]  in Géotechnique > Vol. 61 N° 3 (Mars 2011) . - pp. 221–234 Titre : Large-displacement interface shear between steel and granular media Type de document : texte imprimé Auteurs : T. Y. K. Ho, Auteur ; R. J. Jardine, Auteur ; N. Anh-Minh, Auteur Année de publication : 2011 Article en page(s) : pp. 221–234 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Soil/Structure  interaction  Piles  Laboratory  tests Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A systematic study is reported of the behaviour of graded silica sands and a silica rock flour silt, sheared against steel interfaces. Ring shear experiments investigated the influences of interface position, displacement scale, normal stress level and particle size distribution on ultimate interface friction angle, δ ′ cv . Grain crushing is shown to play an important role within a concentrated shear zone, and this process, along with changes in the roughness of the interface, could lead to δ ′ values markedly different from those developed in conventional small-displacement direct shear tests. It is also shown that δ ′ measurements at smaller displacements may depend on whether the interface is mounted above or below the sample, but that such differences diminish to zero when displacements are large. The finding that δ′ is strongly displacement-dependent over the single-millimetre to multiple-metre scale has many practical geotechnical engineering implications. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.8.p.086 [article] Large-displacement interface shear between steel and granular media [texte imprimé] / T. Y. K. Ho, Auteur ; R. J. Jardine, Auteur ; N. Anh-Minh, Auteur . - 2011 . - pp. 221–234. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 61 N° 3 (Mars 2011) . - pp. 221–234 Mots-clés : Soil/Structure  interaction  Piles  Laboratory  tests Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A systematic study is reported of the behaviour of graded silica sands and a silica rock flour silt, sheared against steel interfaces. Ring shear experiments investigated the influences of interface position, displacement scale, normal stress level and particle size distribution on ultimate interface friction angle, δ ′ cv . Grain crushing is shown to play an important role within a concentrated shear zone, and this process, along with changes in the roughness of the interface, could lead to δ ′ values markedly different from those developed in conventional small-displacement direct shear tests. It is also shown that δ ′ measurements at smaller displacements may depend on whether the interface is mounted above or below the sample, but that such differences diminish to zero when displacements are large. The finding that δ′ is strongly displacement-dependent over the single-millimetre to multiple-metre scale has many practical geotechnical engineering implications. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.8.p.086

A numerical simulation of underwater slope failures generated by salt diapirism combined with active sedimentation / N. Kovacevic in Géotechnique, Vol. 62 N° 9 (Septembre 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 9 (Septembre 2012) . - pp. 777 –786 Titre : A numerical simulation of underwater slope failures generated by salt diapirism combined with active sedimentation Type de document : texte imprimé Auteurs : N. Kovacevic, Auteur ; R. J. Jardine, Auteur ; D. M. Potts, Auteur Année de publication : 2012 Article en page(s) : pp. 777 –786 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Failure  Numerical  modelling  Slopes  Landslides  Offshore  engineering Résumé : This paper describes advanced finite-element simulations of a geologically active and periodically unstable 700 m high underwater escarpment located in the Gulf of Mexico that has been created by uplifting salt diapirs combined with sediment deposition. The site's geological history, soil permeability and clay shear strength characteristics govern current slope stability, and determine the timing of any future failure. The geological and geotechnical conditions are reported before presenting fully coupled, large-displacement numerical simulations employing critical state formulations of the slope's evolution over the last 600 000 years. The latter form the basis for strain-softening analyses of the pore pressure equalisation and progressive failure processes that control current slope stability. The analyses also address the ground movement patterns that precede instability, giving useful information for geohazard risk assessment and early warning monitoring system design. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.12.OG.004 [article] A numerical simulation of underwater slope failures generated by salt diapirism combined with active sedimentation [texte imprimé] / N. Kovacevic, Auteur ; R. J. Jardine, Auteur ; D. M. Potts, Auteur . - 2012 . - pp. 777 –786. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 9 (Septembre 2012) . - pp. 777 –786 Mots-clés : Failure  Numerical  modelling  Slopes  Landslides  Offshore  engineering Résumé : This paper describes advanced finite-element simulations of a geologically active and periodically unstable 700 m high underwater escarpment located in the Gulf of Mexico that has been created by uplifting salt diapirs combined with sediment deposition. The site's geological history, soil permeability and clay shear strength characteristics govern current slope stability, and determine the timing of any future failure. The geological and geotechnical conditions are reported before presenting fully coupled, large-displacement numerical simulations employing critical state formulations of the slope's evolution over the last 600 000 years. The latter form the basis for strain-softening analyses of the pore pressure equalisation and progressive failure processes that control current slope stability. The analyses also address the ground movement patterns that precede instability, giving useful information for geohazard risk assessment and early warning monitoring system design. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.12.OG.004