Synopsis It is apparent that the principle of effective stress alone is inadequate to explain volumetric behaviour of partially saturated soils subjected to external stresses. This Paper describes a method which can be adopted to explain the behavior of patially saturated soils subjected mainly to increasing proportional loading (all-round pressure and K0 loading). By treating applied stress and suction as two independent variables, it is shown that variations in void ratio and degree of saturation are represented by unique surfaces in a stress-void ratio and stress-degree of saturation space respectively. Il est évident que le principe de tension efficace seul ne suffit pas à expliquer le comportement volumétrique de sols partiellement saturés soumis à des tensions externes. Cet expose décrit une méthode que l'on peut adopter pour expliquer le comportement de sols partiellement saturés soumis principalement à des charges proportionnelles croissantes (pression dans toutes les directions et charge K0). En traitant la tension appliquée et la succion en tant que deux variables independantes, on montre que les variations de l'indice de vide et du degré de saturation sont représentées par des surfaces uniques dans un espace tension-indice de vide et tension degré de saturation respectivement.

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This paper presents the results of a comparative study of both field and laboratory measurements of the geotechnical properties of a very dense glacial till. This study was carried out to determine the feasibility of founding the major structures of a thermal generating station complex on very dense till. In situ pressuremeter tests, vertical and lateral plate load tests, and in situ shear box tests were carried out. A comparative laboratory test program on soil specimens from undisturbed block samples consisted of drained and undrained triaxial compression tests including a number of K0 and stress path tests. Foundation design parameters obtained from pressuremeter tests were in good agreement with the plate load test values. Laboratory test values underestimate the strength and deformation modulus of the dense till. The factors which influence the differences in the field and laboratory values of the strength and deformation properties of the till are discussed.