Abstract
Extensive field and laboratory tests were carried out on an alluvial marine clay in the Tokyo Bay to grasp its undrained strength characteristics. First, a procedure for obtaining the in-situ undrained strength of the clay in the laboratory tests is discussed in the light of the fundamental properties of the aged alluvial clay. Then undrained strength and anisotropy in the undrained strength of this clay both in the field and in the normally consolidated state are reported and discussed including the effect of the strain rate on the undrained strength. Further, overconsolidated state was considered and overconsolidation ratio resulting from secondary compression and cementation was quantitatively evaluated for this clay. Finally it was suggested from an examination on in-situ vane strength tests that K0 value of this clay is constant through depth and is independent on overconsolidation ratio.
