Documents disponibles écrits par cet auteur

Bearing capacity under cyclic loading — offshore, along the coast, and on land / Knut H. Andersen in Canadian geotechnical journal, Vol. 46 N° 5 (Mai 2009) 

Public ISBD [article]  in Canadian geotechnical journal > Vol. 46 N° 5 (Mai 2009) . - pp. 513–535 Titre : Bearing capacity under cyclic loading — offshore, along the coast, and on land : the 21st Bjerrum Lecture presented in Oslo, 23 November 2007 Type de document : texte imprimé Auteurs : Knut H. Andersen, Auteur Article en page(s) : pp. 513–535 Note générale : Sciences de la Terre Langues : Anglais (eng) Mots-clés : Cyclic  shear  strength  Bearing  capacity  Clay  Sand  Silt  Design  diagrams  Résistance  au  cisaillement  cyclique  Capacité  portante  Argile  Sable  Silt  Diagrammes  de  conception Index. décimale : 550 Sciences auxiliaires de la géologie. Résumé : Cyclic loading can be important for the foundation design of structures, both offshore, along the coast, and on land, and for the stability of slopes. This is illustrated by several examples. The paper discusses how soil behaves under cyclic loading, both for structures and for slopes, and shows that the cyclic shear strength and the failure mode under cyclic loading depend strongly on the stress path and the combination of average and cyclic shear stresses. Diagrams with the cyclic shear strength of clay, sand, and silt that can be used in practical design are presented. Comparisons between calculations and model tests indicate that foundation capacity under cyclic loading can be determined on the basis of cyclic shear strength determined in laboratory tests. Le chargement cyclique est important pour la conception de fondations de structures, autant en mer, sur la côte et sur la terre, et pour la stabilité des pentes. Ceci est illustré à l’aide de plusieurs exemples. Cet article discute du comportement du sol soumis à un chargement cyclique, pour la structure et les pentes, et démontre que la résistance au cisaillement cyclique et le mode de défaillance sous chargement cyclique dépendent fortement du cheminement des contraintes et de la combinaison des contraintes en cisaillement moyennes et cycliques. Des diagrammes de résistance au cisaillement cyclique pour l’argile, sable et silt, qui peuvent être utilisés pour la conception, sont présentés. Des comparaisons entre les calculs et les essais modélisés indiquent que la capacité de la fondation soumise à un chargement cyclique peut être déterminée à partir de la résistance au cisaillement cyclique obtenu par des essais en laboratoire. DEWEY : 550 ISSN : 0008-3674 En ligne : http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=f [...] [article] Bearing capacity under cyclic loading — offshore, along the coast, and on land : the 21st Bjerrum Lecture presented in Oslo, 23 November 2007 [texte imprimé] / Knut H. Andersen, Auteur . - pp. 513–535. Sciences de la Terre Langues : Anglais (eng) in Canadian geotechnical journal > Vol. 46 N° 5 (Mai 2009) . - pp. 513–535 Mots-clés : Cyclic  shear  strength  Bearing  capacity  Clay  Sand  Silt  Design  diagrams  Résistance  au  cisaillement  cyclique  Capacité  portante  Argile  Sable  Silt  Diagrammes  de  conception Index. décimale : 550 Sciences auxiliaires de la géologie. Résumé : Cyclic loading can be important for the foundation design of structures, both offshore, along the coast, and on land, and for the stability of slopes. This is illustrated by several examples. The paper discusses how soil behaves under cyclic loading, both for structures and for slopes, and shows that the cyclic shear strength and the failure mode under cyclic loading depend strongly on the stress path and the combination of average and cyclic shear stresses. Diagrams with the cyclic shear strength of clay, sand, and silt that can be used in practical design are presented. Comparisons between calculations and model tests indicate that foundation capacity under cyclic loading can be determined on the basis of cyclic shear strength determined in laboratory tests. Le chargement cyclique est important pour la conception de fondations de structures, autant en mer, sur la côte et sur la terre, et pour la stabilité des pentes. Ceci est illustré à l’aide de plusieurs exemples. Cet article discute du comportement du sol soumis à un chargement cyclique, pour la structure et les pentes, et démontre que la résistance au cisaillement cyclique et le mode de défaillance sous chargement cyclique dépendent fortement du cheminement des contraintes et de la combinaison des contraintes en cisaillement moyennes et cycliques. Des diagrammes de résistance au cisaillement cyclique pour l’argile, sable et silt, qui peuvent être utilisés pour la conception, sont présentés. Des comparaisons entre les calculs et les essais modélisés indiquent que la capacité de la fondation soumise à un chargement cyclique peut être déterminée à partir de la résistance au cisaillement cyclique obtenu par des essais en laboratoire. DEWEY : 550 ISSN : 0008-3674 En ligne : http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=f [...]

Penetration resistance of offshore skirted foundations and anchors in dense sand / Knut H. Andersen in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°1 (Janvier 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°1 (Janvier 2008) . - pp. 106–116 Titre : Penetration resistance of offshore skirted foundations and anchors in dense sand Type de document : texte imprimé Auteurs : Knut H. Andersen, Auteur ; Hans Petter Jostad, Auteur ; Rune Dyvik, Auteur Année de publication : 2008 Article en page(s) : pp. 106–116 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Sand  Layered  soils  Weight  Model  tests  Offshore  structures  Foundations  Anchors Résumé : Penetration of skirts is an essential design issue for offshore skirted foundations and anchors in sand. Skirts may not penetrate far enough into dense sand by the available submerged weight alone. It may therefore be necessary to apply underpressure inside the skirt compartment to produce an increased driving force and to reduce the penetration resistance. This paper recommends procedures to calculate penetration resistance and required underpressure for skirts penetrated in dense sand with and without interbedded clay layers. The recommendations are based on interpretation of skirt penetration data from prototypes, field model tests, and laboratory model tests in dense sand. The paper first presents a model to calculate the penetration resistance of skirts penetrated by weight, or other external vertical load that does not cause flow of water in the sand. Two models are considered; one based on bearing capacity equations with friction angles from laboratory tests, and the other one based on empirical correlations with CPT tip resistance. The bearing capacity model gives more consistent correlations with the empirical data than the CPT model. Thereafter, a model to account for the effect of underpressure applied inside the skirt compartment is proposed. This model is developed based on interpretation of available prototype and model test data from skirts penetrated by underpressure. The results show that underpressure facilitates skirt penetration in sand considerably by providing both an additional penetration force and a reduced penetration resistance. It is also shown that interbedded clay layers can prevent flow of water through the sand and eliminate the beneficial reduction in penetration resistance. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A1%2810 [...] [article] Penetration resistance of offshore skirted foundations and anchors in dense sand [texte imprimé] / Knut H. Andersen, Auteur ; Hans Petter Jostad, Auteur ; Rune Dyvik, Auteur . - 2008 . - pp. 106–116. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°1 (Janvier 2008) . - pp. 106–116 Mots-clés : Sand  Layered  soils  Weight  Model  tests  Offshore  structures  Foundations  Anchors Résumé : Penetration of skirts is an essential design issue for offshore skirted foundations and anchors in sand. Skirts may not penetrate far enough into dense sand by the available submerged weight alone. It may therefore be necessary to apply underpressure inside the skirt compartment to produce an increased driving force and to reduce the penetration resistance. This paper recommends procedures to calculate penetration resistance and required underpressure for skirts penetrated in dense sand with and without interbedded clay layers. The recommendations are based on interpretation of skirt penetration data from prototypes, field model tests, and laboratory model tests in dense sand. The paper first presents a model to calculate the penetration resistance of skirts penetrated by weight, or other external vertical load that does not cause flow of water in the sand. Two models are considered; one based on bearing capacity equations with friction angles from laboratory tests, and the other one based on empirical correlations with CPT tip resistance. The bearing capacity model gives more consistent correlations with the empirical data than the CPT model. Thereafter, a model to account for the effect of underpressure applied inside the skirt compartment is proposed. This model is developed based on interpretation of available prototype and model test data from skirts penetrated by underpressure. The results show that underpressure facilitates skirt penetration in sand considerably by providing both an additional penetration force and a reduced penetration resistance. It is also shown that interbedded clay layers can prevent flow of water through the sand and eliminate the beneficial reduction in penetration resistance. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A1%2810 [...]