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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Part of this work was done with the financial support of the MENRT (French Educational Ministry of Research and Technology) to the third author. Special thanks are also due to Mrs. M.C. Jean for reviewing the draft version.
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Doanh, T., Dubujet, P. & Touron, G. Exploring the undrained induced anisotropy of Hostun RF loose sand. Acta Geotech. 5, 239–256 (2010). https://doi.org/10.1007/s11440-010-0128-x
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DOI: https://doi.org/10.1007/s11440-010-0128-x