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Centrifuge model study of spudcan penetration in sand overlying clay / K. L. Teh in Géotechnique, Vol. 60 N° 11 (Novembre 2010) 

Public ISBD [article]  in Géotechnique > Vol. 60 N° 11 (Novembre 2010) . - pp. 825–842 Titre : Centrifuge model study of spudcan penetration in sand overlying clay Type de document : texte imprimé Auteurs : K. L. Teh, Auteur ; C. F. Leung, Auteur ; Y. K. Chow, Auteur Année de publication : 2011 Article en page(s) : pp. 825–842 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Bearing  capacity  Sands  Footings/foundations  Centrifuge  modelling  Clays  Offshore  engineering Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A series of centrifuge model tests has been conducted to investigate the bearing resistance of spudcan foundations of offshore jack-up rigs in sand overlying normally consolidated clay. The spudcan bearing-resistance profiles measured in most of the tests recorded a peak resistance at a shallow depth within the upper sand layer, followed by an abrupt post-peak reduction in resistance causing the spudcan to plunge into the underlying soft clay. This phenomenon is commonly termed as ‘spudcan punch-through hazard', which potentially leads to severe structural damage of jack-up rigs in the field. The centrifuge test results revealed that the ratio of upper sand layer thickness over spudcan diameter and the ratio of bearing resistance between the upper sand and underlying clay affect the development of spudcan bearing resistance. The limitations of existing design methods, which were derived for the ultimate bearing capacity of pre-embedded shallow foundation to assess the spudcan bearing resistance-depth profile, are also identified. It is proposed that the profile may be assessed by focusing on three key characteristic bearing resistances. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.8.p.077 [article] Centrifuge model study of spudcan penetration in sand overlying clay [texte imprimé] / K. L. Teh, Auteur ; C. F. Leung, Auteur ; Y. K. Chow, Auteur . - 2011 . - pp. 825–842. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 60 N° 11 (Novembre 2010) . - pp. 825–842 Mots-clés : Bearing  capacity  Sands  Footings/foundations  Centrifuge  modelling  Clays  Offshore  engineering Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A series of centrifuge model tests has been conducted to investigate the bearing resistance of spudcan foundations of offshore jack-up rigs in sand overlying normally consolidated clay. The spudcan bearing-resistance profiles measured in most of the tests recorded a peak resistance at a shallow depth within the upper sand layer, followed by an abrupt post-peak reduction in resistance causing the spudcan to plunge into the underlying soft clay. This phenomenon is commonly termed as ‘spudcan punch-through hazard', which potentially leads to severe structural damage of jack-up rigs in the field. The centrifuge test results revealed that the ratio of upper sand layer thickness over spudcan diameter and the ratio of bearing resistance between the upper sand and underlying clay affect the development of spudcan bearing resistance. The limitations of existing design methods, which were derived for the ultimate bearing capacity of pre-embedded shallow foundation to assess the spudcan bearing resistance-depth profile, are also identified. It is proposed that the profile may be assessed by focusing on three key characteristic bearing resistances. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.8.p.077