EFFECTIVE STRESS BEHAVIOR OF CLAYS IN UNCONFINED COMPRESSION TESTS

Abstract

Unconfined compression tests with the measurement of suction and CIU triaxial compression tests were carried out on a remolded and reconsolidated sample to evaluate whether the effective stress behavior in the unconfined compression tests could be explained through the results from the triaxial tests. It is shown that : effective stress paths in unconfined compression tests are very similar to those in triaxial tests; and unconfined compressive strengths can be predicted well by using those relationships between A_f and the overconsolidation ratio and alternatively between the ratio of the undrained strength to the consolidation stress and the overconsolidation ratio obtained from triaxial tests.