Caractérisation de l'état limite de l'argile de Pornic

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Abstract
This paper describes a natural clay, the Pornic clay, in accordance with the yield state and critical state concepts. The author has carried out a series of axisymmetrical triaxial tests on a natural overconsolidated clay and has clearly shown the yield state curve of the material; the curve is defined as the intersection of the yield state and "overconsolidated state" surfaces. The stress-strain paths are plotted either in the original p′-q-ε-v diagram or in the normalized diagram where the stresses are defined with respect to the preconsolidation pressure [Formula: see text], thus allowing one to characterize the reciprocity of the stress and strain paths and to follow their evolution mainly near the yield state curve. Key words: clay, yield state, overconsolidated state, stress path, strain path.

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