EFFECT OF OVERCONSOLIDATION ON DILATANCY OF A COHESIVE SOIL

概要

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In this paper, the characteristics of dilatancy, i. e., the volumetric change which occurs when subjected to shear stress under the condition that the effective mean normal stress p is held constant, are examined performing p-constant stress-controlled drained triaxial compression tests on a clayey soil with various OCRs.For the understanding and interpretation of test results, the state paths on normalized state plane (q/p_e, p/p_e), where p_e is Hvorslev's parameter, and the relations between stress ratio and strain increment ratio are discussed using a few OCR dependent parameters which serve to specify the dilatancy characteristics. The sign of dilatancy volumetric strain is classified according to the degree of overconsolidation and the shear stress level.Additionally the non-linearity of swelling index κ is shown and the applicability of a relationship between κ and OCR, which has been proposed, is demonstrated for the clay used in this study and other cohesive soils appeared in literatures.
1982-12-15