EFFECT OF FINES CONTENT ON LIQUEFACTION CHARACTERISTICS

Abstract

The 1995 Hanshin Earthquake confirmed that soil containing fine fraction would be liquefied. In many cases, the effect of the fine fraction on liquefaction strength has not been clarified yet. In particular, it is not so many researchers have used samples containing a large amount of fine fraction, although the fine fraction presents the predomination in its field. Therefore, the purpose is to clarify the fine fraction's effect on the liquefaction strength of sand-clay within the parameters of the skeleton void ratio. The fine fraction content of the specimens has a distinct span from small to large. The coarse-grained soil used Toyoura sand mixed with 0 ~ 40% Kaolin clay in a dry state. The specimens (D=50mm, H=100mm) are made by using the dry tamping method. These specimens were used to do the undrained cyclic triaxial test. The test results show that when the skeleton void ratio does not exceed the maximum void ratio of sand, the fine fraction does not affect liquefaction strength regardless of its type. And the liquefaction strength of the specimen has a certain relationship with the skeleton void ratio. When the skeleton void ratio exceeds the maximum void ratio of sand, the fine fraction is in a remarkable position. And the liquefaction strength has a good correlation with the fine fraction void ratio.