COMPRESSION AND STRENGTH CHARACTERISTICS OF UPPER PLEISTOCENE CLAY (Ma 12) IN OSAKA BAY

This paper deals with the mechanical properties of the Upper Pleistocene Clay which is deposited typically at the depth of 70 to 90m below sea level in the north areas of the Osaka Bay. The compression characteristics of the clay was investigated by carrying out a series of strain controlled drained triaxial tests including tests with K0 condition. The test results indicate that the variation of pre-consolidation pressure increases almost linearly with depth as compared with a large scatter of the data obtained from standard oedometer tests. Also the effect of aging on the mechanical properties of the clay was studied by comparing the behaviour of undisturbed and re-sedimented samples during oedometer and undrained triaxial tests. The results indicate that there is a significant effect of aging on the clay behaviour.