[article] 
inJournal of geotechnical and geoenvironmental engineering > Vol. 134 N°2 (Fevrier 2008) . - pp. 154–163

Titre :	Uplift mechanisms of pipes buried in sand
Type de document :	texte imprimé
Auteurs :	C. Y. Cheuk, Auteur ; D. J. White, Auteur ; M. D. Bolton, Auteur
Année de publication :	2008
Article en page(s) :	pp. 154–163
Note générale :	Geotechnical and geoenvironmental engineeringa
Langues :	Anglais (eng)
Mots-clés :	Buried pipes Soil deformation Sand Uplift resistance Particle size Imaging techniques
Résumé :	Reliable design against upheaval buckling of offshore pipelines requires the uplift response to be predicted. This paper describes a model-scale investigation into the mechanisms by which uplift resistance is mobilized in silica sand, and illustrates how the observed mechanisms are captured in prediction models. A novel image-based deformation measurement technique has been used. The results show that peak uplift resistance is mobilized through the formation of an inverted trapezoidal block, bounded by a pair of distributed shear zones. The inclination of the shear zone is dependent on the soil density, and therefore dilatancy. After peak resistance, shear bands form and softening behavior is observed. At large pipe displacements, either a combination of a vertical sliding block mechanism and a flow-around mechanism near the pipe or a localized flow-around mechanism without surface heave is observed, depending on the soil density and particle size.
En ligne :	http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A2%2815 [...]

[article] Uplift mechanisms of pipes buried in sand [texte imprimé] / C. Y. Cheuk, Auteur ; D. J. White, Auteur ; M. D. Bolton, Auteur . - 2008 . - pp. 154–163.
Geotechnical and geoenvironmental engineeringa
Langues : Anglais (eng)
in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°2 (Fevrier 2008) . - pp. 154–163

Mots-clés :	Buried pipes Soil deformation Sand Uplift resistance Particle size Imaging techniques
Résumé :	Reliable design against upheaval buckling of offshore pipelines requires the uplift response to be predicted. This paper describes a model-scale investigation into the mechanisms by which uplift resistance is mobilized in silica sand, and illustrates how the observed mechanisms are captured in prediction models. A novel image-based deformation measurement technique has been used. The results show that peak uplift resistance is mobilized through the formation of an inverted trapezoidal block, bounded by a pair of distributed shear zones. The inclination of the shear zone is dependent on the soil density, and therefore dilatancy. After peak resistance, shear bands form and softening behavior is observed. At large pipe displacements, either a combination of a vertical sliding block mechanism and a flow-around mechanism near the pipe or a localized flow-around mechanism without surface heave is observed, depending on the soil density and particle size.
En ligne :	http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A2%2815 [...]