YIELD STATES AND STRESS-STRAIN RELATIONSHIPS IN A NATURAL PLASTIC CLAY

This paper describes tests on 76 mm diameter triaxial samples of natural plastic Lake Agassiz clay from Winnipeg. The samples were carefully trimmed, reconsolidated to approximately their in-situ stresses, and loaded in stress controlled tests. Comparison of one-dimensional yielding states with results from triaxial tests that were continued to large strains suggests that the clay is cemented. At stresses inside the yield surface, the clay exhibits substantially linear elastic behavior which is transversely isotropic.