Documents disponibles écrits par cet auteur

Effects of soil density and earthquake intensity on flow deformation of the upper San Fernando dam / H. Y. Ming in Géotechnique, Vol. 61 N° 12 (Décembre 2011) 

Public ISBD [article]  in Géotechnique > Vol. 61 N° 12 (Décembre 2011) . - pp. 1019–1034 Titre : Effects of soil density and earthquake intensity on flow deformation of the upper San Fernando dam Type de document : texte imprimé Auteurs : H. Y. Ming, Auteur ; X.S. Li, Auteur ; T. Y. Zheng, Auteur Année de publication : 2012 Article en page(s) : pp. 1019–1034 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Numerical  modelling  Earthquakes  Dynamics  Embankments  Liquefaction  Deformation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The seismic performance of the upper San Fernando dam is systematically studied by using a fully coupled finite-element procedure in conjunction with a unified state-dependent dilatancy sand model. With detailed information produced by this procedure, the effects of soil density and earthquake intensity on flow deformation of the embankment are examined. This paper provides convincing numerical evidence to prove that even though stronger earthquakes always produce larger deformation in the Upper San Fernando dam, an earthquake serves mainly as a trigger to initiate flow liquefaction. Once flow liquefaction is triggered by a sufficiently strong earthquake, the earthquake-induced flow deformation is controlled dominantly by the difference between the shear stress required for equilibrium and the shear strength of the liquefied soil, which is determined by its density under undrained earthquake loading conditions. The influence of the intensity of the earthquake itself on flow deformation of the embankment becomes secondary. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.9.p.004.3682 [article] Effects of soil density and earthquake intensity on flow deformation of the upper San Fernando dam [texte imprimé] / H. Y. Ming, Auteur ; X.S. Li, Auteur ; T. Y. Zheng, Auteur . - 2012 . - pp. 1019–1034. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 61 N° 12 (Décembre 2011) . - pp. 1019–1034 Mots-clés : Numerical  modelling  Earthquakes  Dynamics  Embankments  Liquefaction  Deformation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The seismic performance of the upper San Fernando dam is systematically studied by using a fully coupled finite-element procedure in conjunction with a unified state-dependent dilatancy sand model. With detailed information produced by this procedure, the effects of soil density and earthquake intensity on flow deformation of the embankment are examined. This paper provides convincing numerical evidence to prove that even though stronger earthquakes always produce larger deformation in the Upper San Fernando dam, an earthquake serves mainly as a trigger to initiate flow liquefaction. Once flow liquefaction is triggered by a sufficiently strong earthquake, the earthquake-induced flow deformation is controlled dominantly by the difference between the shear stress required for equilibrium and the shear strength of the liquefied soil, which is determined by its density under undrained earthquake loading conditions. The influence of the intensity of the earthquake itself on flow deformation of the embankment becomes secondary. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.9.p.004.3682

A model for natural soil with bonds / W. M. Yan in Géotechnique, Vol. 61 N° 2 (Fevrier 2011) 

Public ISBD [article]  in Géotechnique > Vol. 61 N° 2 (Fevrier 2011) . - pp. 95–106 Titre : A model for natural soil with bonds Type de document : texte imprimé Auteurs : W. M. Yan, Auteur ; X.S. Li, Auteur Année de publication : 2011 Article en page(s) : pp. 95–106 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Constitutive  relations  Clays  Theoretical  analysis  Shear  strength  Plasticity  Numerical  modelling Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents a thermodynamically consistent constitutive model for natural soils with bonds. In the model, the free energy (the internal energy available to do work) is contributed partly by the so-called frozen or locked energy, whose evolution is assumed to be homogeneously related to the irrecoverable deformation. During loading, the bonds existing in the natural soil not only boost the dissipation rate but also liberate certain historically accumulated locked energy. Such effects, however, are diminished as loading proceeds and the bonds are destroyed. The novel aspect of the present model is that it accommodates both the Mohr–Coulomb and critical-state failure modes, and the two modes are unified through the evolution law of a thermodynamic force associated with the locked bonding energy. As compared with the classical Cam-clay models, the model contains two additional material constants, where one is proposed by Collins & Kelly to improve the shape of the yield surface, and the other is dedicated to bonding evolution. The calibration procedure for the material parameters is provided. The capability of the model is demonstrated by a series of model simulations on a hypothetical bonded soil under various triaxial loading paths, and the model response is also compared with representative testing results in the literature. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.8.p.061 [article] A model for natural soil with bonds [texte imprimé] / W. M. Yan, Auteur ; X.S. Li, Auteur . - 2011 . - pp. 95–106. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 61 N° 2 (Fevrier 2011) . - pp. 95–106 Mots-clés : Constitutive  relations  Clays  Theoretical  analysis  Shear  strength  Plasticity  Numerical  modelling Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents a thermodynamically consistent constitutive model for natural soils with bonds. In the model, the free energy (the internal energy available to do work) is contributed partly by the so-called frozen or locked energy, whose evolution is assumed to be homogeneously related to the irrecoverable deformation. During loading, the bonds existing in the natural soil not only boost the dissipation rate but also liberate certain historically accumulated locked energy. Such effects, however, are diminished as loading proceeds and the bonds are destroyed. The novel aspect of the present model is that it accommodates both the Mohr–Coulomb and critical-state failure modes, and the two modes are unified through the evolution law of a thermodynamic force associated with the locked bonding energy. As compared with the classical Cam-clay models, the model contains two additional material constants, where one is proposed by Collins & Kelly to improve the shape of the yield surface, and the other is dedicated to bonding evolution. The calibration procedure for the material parameters is provided. The capability of the model is demonstrated by a series of model simulations on a hypothetical bonded soil under various triaxial loading paths, and the model response is also compared with representative testing results in the literature. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.8.p.061