Determination of undrained shear strength and constrained modulus from DMT for stiff overconsolidated clays

The paper presents the results of dilatometer and laboratory tests performed on heavily preconsolidated boulder clays and Pliocene clays prevailing in the Warsaw region. Several different correlations available for evaluating undrained shear strength and constrained modulus from dilatometer tests are discussed. Empirical coefficients for multi-factor correlation to obtain undrained shear strength from dilatometer tests for boulder clays and Pliocene clays were determined. The relationship between factor RM and horizontal stress index (KD) for boulder clays was proposed for the evaluation of constrained modulus from dilatometer tests.