Documents disponibles écrits par cet auteur

Analysis of tunnel excavation in London / N. A. Gonzalez in Géotechnique, Vol. 62 N° 12 (Décembre 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 12 (Décembre 2012) . - pp. 1095 –1109 Titre : Analysis of tunnel excavation in London : Clay incorporating soil structure Type de document : texte imprimé Auteurs : N. A. Gonzalez, Auteur ; M. Rouainia, Auteur ; M. Arroyo, Auteur Année de publication : 2012 Article en page(s) : pp. 1095 –1109 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Ground  movements  Numerical  modelling  Fabric/structure  of  soils  Tunnels Résumé : Recent studies on London Clay have identified a number of different units in the geological profile, and have highlighted the role of soil structure in mechanical behaviour. In fact, structure is the dominant factor determining the differences in the mechanical response of different units. In the paper, numerical analyses simulating the undrained excavation of a tunnel in St James's Park are presented. London Clay behaviour is characterised by a kinematic-hardening structured soil model incorporating structure and stiffness degradation. The parameters and initial conditions are based on a careful calibration that takes into account the presence of different units within the London Clay formation and the different degrees of soil structure. The analyses performed result in a very satisfactory reproduction of the magnitude and patterns of short-term surface and subsurface displacements, as well as pore pressures. The paper concludes with a discussion of the results in the context of other analyses performed previously, and puts forward some considerations concerning design issues. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.11.P.030 [article] Analysis of tunnel excavation in London : Clay incorporating soil structure [texte imprimé] / N. A. Gonzalez, Auteur ; M. Rouainia, Auteur ; M. Arroyo, Auteur . - 2012 . - pp. 1095 –1109. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 12 (Décembre 2012) . - pp. 1095 –1109 Mots-clés : Ground  movements  Numerical  modelling  Fabric/structure  of  soils  Tunnels Résumé : Recent studies on London Clay have identified a number of different units in the geological profile, and have highlighted the role of soil structure in mechanical behaviour. In fact, structure is the dominant factor determining the differences in the mechanical response of different units. In the paper, numerical analyses simulating the undrained excavation of a tunnel in St James's Park are presented. London Clay behaviour is characterised by a kinematic-hardening structured soil model incorporating structure and stiffness degradation. The parameters and initial conditions are based on a careful calibration that takes into account the presence of different units within the London Clay formation and the different degrees of soil structure. The analyses performed result in a very satisfactory reproduction of the magnitude and patterns of short-term surface and subsurface displacements, as well as pore pressures. The paper concludes with a discussion of the results in the context of other analyses performed previously, and puts forward some considerations concerning design issues. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.11.P.030

Increasing the resistance of piles subject to cyclic lateral loading / J. Peng in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 10 (Octobre 2011) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 977-985 Titre : Increasing the resistance of piles subject to cyclic lateral loading Type de document : texte imprimé Auteurs : J. Peng, Auteur ; B. G. Clarke, Auteur ; M. Rouainia, Auteur Année de publication : 2012 Article en page(s) : pp. 977-985 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Geotechnical  engineering  Foundations  Offshore  structures  Soil  mechanics  Sand  Laboratory  equipment  Cyclic  tests  Cyclic  loads Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Small-scale tests were carried out on a monopile and fin piles to determine the effect the length of fins had upon the lateral displacement of cyclically loaded piles. A variety of loading conditions were applied to model piles in a dense sand by using a mechanical loading system. Ten thousand cycles were used in each test to represent 20 years of environmental loading on offshore structures. Variables included the magnitude, frequency, and direction of the load; the type of pile tip; and the length of the fins. The reduction in pile head displacement was used as a measure of the efficiency of the fins. The tests show that the fins reduced the lateral displacement by at least 50% after 10,000 cycles. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i10/p977_s1?isAuthorized=no [article] Increasing the resistance of piles subject to cyclic lateral loading [texte imprimé] / J. Peng, Auteur ; B. G. Clarke, Auteur ; M. Rouainia, Auteur . - 2012 . - pp. 977-985. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 977-985 Mots-clés : Geotechnical  engineering  Foundations  Offshore  structures  Soil  mechanics  Sand  Laboratory  equipment  Cyclic  tests  Cyclic  loads Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Small-scale tests were carried out on a monopile and fin piles to determine the effect the length of fins had upon the lateral displacement of cyclically loaded piles. A variety of loading conditions were applied to model piles in a dense sand by using a mechanical loading system. Ten thousand cycles were used in each test to represent 20 years of environmental loading on offshore structures. Variables included the magnitude, frequency, and direction of the load; the type of pile tip; and the length of the fins. The reduction in pile head displacement was used as a measure of the efficiency of the fins. The tests show that the fins reduced the lateral displacement by at least 50% after 10,000 cycles. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i10/p977_s1?isAuthorized=no