Secondary Compression in the Shear of Clays

by Leonard K. Walker,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1969, Vol. 95, Issue 1, Pg. 167-188

Document Type: Journal Paper


The amount of secondary deformation measured when shear-testing a laboratory sample of kaolin depends largely on its effective stress state, which may vary from a hydrostatic state of stress to stresses causing incipient failure in the specimen. Such deformation does not, however, appear to influence the basic stress-strain curve for the material, as this is essentially independent of load duration. Thus, in a limited sense, the stress-strain relationship may be considered as time-independent, Secondary deformation data from drained shear tests are decomposed into volumetric and shear components. In this way, creep in shear is interpreted as a stress-dilatancy phenomenon, and as such may be contrasted with similar relationships which describe the process of primary deformation in shear tests.

Subject Headings: Shear tests | Shear deformation | Stress strain relations | Soil compression | Shear stress | Job satisfaction | Clays | Shear failures

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