Interrelationship between field vane shear strength and undrained shear strengths from laboratory tests

Abstract

In this study, based on results of field vane shear test conducted on 21 domestic and 9 overseas clay soils and laboratory tests using collected undisturbed samples at each location, correlations between field vane shear strength and undrained shear strength obtained from constant volume direct box shear test and unconfined compression test were examined. As a result, it was clarified that the field vane shear strength measured at a clay soil with a high permeability, a large coefficient of consolidation and a possibility of a large organic content becomes relatively large. Accordingly, the correlation equation for obtaining undrained shear strength from the field vane shear test equivalent of the one from the laboratory tests was derived based on the data except in above mentioned ground conditions.