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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