Documents disponibles écrits par cet auteur

Analysis of the cone penetration test in layered clay / J. Walker in Géotechnique, Vol. 60 N° 12 (Décembre 2010) 

Public ISBD [article]  in Géotechnique > Vol. 60 N° 12 (Décembre 2010) . - pp. 939–948 Titre : Analysis of the cone penetration test in layered clay Type de document : texte imprimé Auteurs : J. Walker, Auteur ; H.-S. Yu, Auteur Année de publication : 2011 Article en page(s) : pp. 939–948 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Numerical  modelling  In  situ  testing  Clays Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents an analysis of the cone penetration test in multi-layered clays using the commercial finite-element code Abaqus/Explicit. The von Mises yield criterion and its associated flow rule are assumed to model the plastic behaviour of elastoplastic undrained clays. An arbitrary Lagrangian–Eulerian scheme and an enhanced hourglass algorithm are adopted to preserve the quality of mesh throughout the numerical simulation. Initially, the behaviour of the penetration resistance is examined in a soil with only two layers. The bottom layer is the weaker of the two and the behaviour of the penetration resistance when the cone approaches the lower layer is studied. The investigation is then extended to study the cone penetration test in a multi-layered clay by sandwiching a weaker clay layer between two stronger clay layers. The thickness of the weaker clay layer is varied and the behaviour of the penetration resistance is studied in relation to the thickness and relative strength of the soil layers. The results are discussed with respect to the soil mechanisms that are present when the cone moves past the relevant layer boundaries so that the position of these boundaries can be determined more accurately. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.7.00153 [article] Analysis of the cone penetration test in layered clay [texte imprimé] / J. Walker, Auteur ; H.-S. Yu, Auteur . - 2011 . - pp. 939–948. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 60 N° 12 (Décembre 2010) . - pp. 939–948 Mots-clés : Numerical  modelling  In  situ  testing  Clays Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents an analysis of the cone penetration test in multi-layered clays using the commercial finite-element code Abaqus/Explicit. The von Mises yield criterion and its associated flow rule are assumed to model the plastic behaviour of elastoplastic undrained clays. An arbitrary Lagrangian–Eulerian scheme and an enhanced hourglass algorithm are adopted to preserve the quality of mesh throughout the numerical simulation. Initially, the behaviour of the penetration resistance is examined in a soil with only two layers. The bottom layer is the weaker of the two and the behaviour of the penetration resistance when the cone approaches the lower layer is studied. The investigation is then extended to study the cone penetration test in a multi-layered clay by sandwiching a weaker clay layer between two stronger clay layers. The thickness of the weaker clay layer is varied and the behaviour of the penetration resistance is studied in relation to the thickness and relative strength of the soil layers. The results are discussed with respect to the soil mechanisms that are present when the cone moves past the relevant layer boundaries so that the position of these boundaries can be determined more accurately. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.7.00153

Three-dimensional finite-element analysis of arching in a piled embankment / Y. Zhuang in Géotechnique, Vol. 62 N° 12 (Décembre 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 12 (Décembre 2012) . - pp. 1127 –1131 Titre : Three-dimensional finite-element analysis of arching in a piled embankment Type de document : texte imprimé Auteurs : Y. Zhuang, Auteur ; E. Ellis, Auteur ; H.-S. Yu, Auteur Année de publication : 2012 Article en page(s) : pp. 1127 –1131 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Embankments  Piles Résumé : Piled embankments rely upon arching of the embankment material onto underlying piles, thus potentially significantly reducing load on the soft subsoil that more generally prevails beneath the embankment. Finite-element modelling of a piled embankment in plane strain has previously been reported; the ‘subsoil' was not explicitly modelled, but was represented by a vertical stress acting on the underside of the embankment. This technical note considers extension of this work to three dimensions. The results make particular reference to prediction of the stress on the subsoil at the point of ‘maximum arching' and the height of influence of arching within the embankment. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.9.P.113 [article] Three-dimensional finite-element analysis of arching in a piled embankment [texte imprimé] / Y. Zhuang, Auteur ; E. Ellis, Auteur ; H.-S. Yu, Auteur . - 2012 . - pp. 1127 –1131. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 12 (Décembre 2012) . - pp. 1127 –1131 Mots-clés : Embankments  Piles Résumé : Piled embankments rely upon arching of the embankment material onto underlying piles, thus potentially significantly reducing load on the soft subsoil that more generally prevails beneath the embankment. Finite-element modelling of a piled embankment in plane strain has previously been reported; the ‘subsoil' was not explicitly modelled, but was represented by a vertical stress acting on the underside of the embankment. This technical note considers extension of this work to three dimensions. The results make particular reference to prediction of the stress on the subsoil at the point of ‘maximum arching' and the height of influence of arching within the embankment. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.9.P.113

Validation experiments for lower-bound shakedown theory applied to layered pavement systems / S. F. Brown in Géotechnique, Vol. 62 N° 10 (Octobre 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 10 (Octobre 2012) . - pp. 923 –932 Titre : Validation experiments for lower-bound shakedown theory applied to layered pavement systems Type de document : texte imprimé Auteurs : S. F. Brown, Auteur ; H.-S. Yu, Auteur ; S. Juspi, Auteur Année de publication : 2012 Article en page(s) : pp. 923 –932 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Pavements  and  roads  Repeated  loading  Deformation Résumé : Experiments involving the application of moving-wheel loads to a series of two- and three-layered pavement systems, involving various soils and unbound granular materials, were used to determine the applied contact pressure ranges within which the structures may be assumed to have developed a ‘shakedown' condition. Shakedown implies that the pavement responds to loading in a resilient manner after some limited plastic deformation during the early load applications. The data were used to assess the validity of applying three-dimensional lower-bound shakedown theory to pavements as a basis for improving pavement design computations. The research indicated that this approach has considerable promise, and that further experimental validation work is desirable. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.11.P.050 [article] Validation experiments for lower-bound shakedown theory applied to layered pavement systems [texte imprimé] / S. F. Brown, Auteur ; H.-S. Yu, Auteur ; S. Juspi, Auteur . - 2012 . - pp. 923 –932. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 10 (Octobre 2012) . - pp. 923 –932 Mots-clés : Pavements  and  roads  Repeated  loading  Deformation Résumé : Experiments involving the application of moving-wheel loads to a series of two- and three-layered pavement systems, involving various soils and unbound granular materials, were used to determine the applied contact pressure ranges within which the structures may be assumed to have developed a ‘shakedown' condition. Shakedown implies that the pavement responds to loading in a resilient manner after some limited plastic deformation during the early load applications. The data were used to assess the validity of applying three-dimensional lower-bound shakedown theory to pavements as a basis for improving pavement design computations. The research indicated that this approach has considerable promise, and that further experimental validation work is desirable. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.11.P.050