Abstract
Undrained triaxial tests were performed on fine containing sands in order to investigate the effects of fine fraction on the liquefaction properties of sand. The results show that the liquefaction strength, which is determined by the double amplitude axial strain DA=5%, and the number of cycles Nc=20, takes the minimum value when the fine fraction is about 20%, if the relative density remains constant. This method, however, does not effectively evaluate the liquefaction strength of fine containing sand. Therefore, the authors investigated an alternative evaluation method using the limit excess pore water pressure ratio (Δu/σ'c)LT. The latter method is judged more effective for evaluating the liquefaction strength of fine containing soil than the conventional method.
