Exploring the undrained induced anisotropy of Hostun RF loose sand |
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Authors: | T Doanh Ph Dubujet G Touron |
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Institution: | 1.Laboratoire Géomatériaux,Ecole Nationale des Travaux Publics de l’Etat,Vaulx en Velin Cedex,France;2.Laboratoire de Tribologie et Dynamique des Systèmes, UMR 5513,Ecole Nationale d’Ingénieurs de Saint-Etienne,Saint-Etienne Cedex 2,France |
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Abstract: | The effects of recent history on the undrained behaviour of very loose and saturated Hostun RF clean sand are investigated
in this paper. From an initial isotropic stress state in the triaxial plane, recent histories are generated by isotropic consolidation
followed by standard drained triaxial preshear in compression, up to a desired value of axial strain or mobilized stress ratio,
and unloading to an initial stress ratio. Subsequent undrained behaviour in triaxial compression is analysed in detail. This
paper contributes to the traits explaining the progressive transformation of a compressive and unstable behaviour of loose
sand into a dilative and stable behaviour of dense-like sand by previous history, while remaining in the same state of loose
density. Experiments show a large pseudo-elastic domain induced by recent history in terms of effective stress paths, function
of the initially mobilized stress ratio level, a unique initial gradient of the effective stress paths depending on the stress
ratio at the beginning of the undrained shearing, a progressive appearance of dilatancy and a surprising evolution the undrained
behaviour of loose sand. Experimental results evidence the important role of the recent deviatoric strain history, from any
initial isotropic or anisotropic stress state. This paper also offers a comprehensive understanding of the history mechanisms
created by simple linear stress paths with fixed direction in the classical triaxial plane. |
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