Abstract
A large amount of reclaimed ground along Tokyo bay suffered damage due to liquefaction during the 2011 Great East Japan Earthquake. The liquefied areas were mostly concentrated in newly reclaimed land. The aging effect is considered to be important for the susceptibility of ground to liquefaction. The liquefied soils contained a lot of fines and the fines content varied by place. In this study, in order to understand the dynamic deformation characteristics of the ground, a series of bender element tests and hollow cylindrical torsional tests were performed on sand and clay mixtures with various proportions of fines content. Furthermore, the water content of the mixed clay was varied between the liquid limit and two times the liquid limit. The variation of water content of the clay in the sand-clay mixtures was considered to represent the effect of aging. Test results show that the maximum shear stiffness decreased with increasing fines content and water content of the clay.
