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The effective stress-strain-volume change relationships of two clays subjected to triaxial compression have been analyzed on the basis of the stressdilatancy theory. Necessary refinements in testing technique are described.
The results indicate that clays respond in a similar manner to sands, and that the interparticle cohesion term, cf, which fits the theory to the observations, is zero for isotropically consolidated specimens and shows a small value for anisotropically consolidated specimens subject to secondary compression. In every case cf is much smaller than the Mohr-Coulomb cohesion term cd, which expresses the variable dilatancy rate of a series of specimens tested over a range of cell pressures. Similar results were obtained after treating one clay with petroleum ether even though the interparticle friction angle øf was increased from 17 to 55 deg.
The Hvorslev cohesion parameter ce, determined from tests on a series of specimens of the same void ratio but of different stress history, dilatancy rate, and soil structure is not a fundamental parameter.
Professor of soil mechanics, University of Manchester,
Soils engineer, Geocon Limited, Toronto,
Soils engineer, SubSoil Surveys Ltd., Manchester,