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Dynamic analysis of a smooth penetrometer free-falling into uniform clay / M. Nazem in Géotechnique, Vol. 62 N° 10 (Octobre 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 10 (Octobre 2012) . - pp. 893 –905 Titre : Dynamic analysis of a smooth penetrometer free-falling into uniform clay Type de document : texte imprimé Auteurs : M. Nazem, Auteur ; J. P. Carter, Auteur ; D. W. Airey, Auteur Année de publication : 2012 Article en page(s) : pp. 893 –905 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Offshore  engineering  Numerical  modelling  Site  investigation  Soil/structure  interaction  Shear  strength Résumé : The finite-element analysis of free-falling objects penetrating soil deposits is one of the most sophisticated and challenging problems in geomechanics. A robust numerical method will be described here for dealing with such complex and difficult problems. The approach is based on the arbitrary Lagrangian–Eulerian (ALE) method of analysis, the main features and challenges of which are described briefly in the paper. The ALE method is then employed to perform a parametric study of a perfectly smooth penetrometer free-falling into a uniform layer of clay, which deforms under undrained conditions. The effect of the mechanical properties of the clay soil on the penetration characteristics is presented, and an approximate, closed-form expression is derived for the dynamic penetration factor, N dp. Comparisons are made between the deduced values of N dp and published values of the conventional cone factor, N c, and comparisons are made with experimental data to validate the approach. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.10.P.055 [article] Dynamic analysis of a smooth penetrometer free-falling into uniform clay [texte imprimé] / M. Nazem, Auteur ; J. P. Carter, Auteur ; D. W. Airey, Auteur . - 2012 . - pp. 893 –905. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 10 (Octobre 2012) . - pp. 893 –905 Mots-clés : Offshore  engineering  Numerical  modelling  Site  investigation  Soil/structure  interaction  Shear  strength Résumé : The finite-element analysis of free-falling objects penetrating soil deposits is one of the most sophisticated and challenging problems in geomechanics. A robust numerical method will be described here for dealing with such complex and difficult problems. The approach is based on the arbitrary Lagrangian–Eulerian (ALE) method of analysis, the main features and challenges of which are described briefly in the paper. The ALE method is then employed to perform a parametric study of a perfectly smooth penetrometer free-falling into a uniform layer of clay, which deforms under undrained conditions. The effect of the mechanical properties of the clay soil on the penetration characteristics is presented, and an approximate, closed-form expression is derived for the dynamic penetration factor, N dp. Comparisons are made between the deduced values of N dp and published values of the conventional cone factor, N c, and comparisons are made with experimental data to validate the approach. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.10.P.055