Undrained Shear Strength of Remoulded Marine Clays

Abstract

ABSTRACT In order to investigate the change in undrained shear strength characteristics corresponding to the change in the test condition and soil type, four different types of consolidated undrained triaxial tests were performed on some natural marine clays in Japan, and the test result was compared with that previously obtained for artificially mixed soils. The following conclusions were obtained, i) Relationship between the undrained shear strength characteristics and the plasticity index obtained for the natural marine clays was practically identical to that obtained for the artificially mixed soils, ii) Angle of shear resistance and pore pressure coefficient at failure were found to be approximately in linear relation with the plasticity index corresponding to the type of triaxial tests, iii) Calculated value of the ratio of the undrained shear strength to consolidation pressure, based on the experimentally obtained relationship between the strength parameters and the plasticity index, compared well to the value measured in each of four different types of triaxial tests, iv) Relationship between undrained shear strength characteristics and the plasticity index obtained in the present study may be used, as the first approximation, for some of marine clays in coastal area of Japan.