RELATIONSHIP BETWEEN LIQUEFACTION STRENGTH OF SANDY SOIL WITH FINE FRACTION

Abstract

The author's research aims to clarify the relationship between fine fraction content, which represents the soil’s skeletal structure, and liquefaction strength. In previous papers, we reported on the behavior of using Toyoura sand (D₅₀=0.16mm) as the coarse grain fraction and various fine grain fractions (silt and clay) using the fine fraction void ratio as a parameter. Good relationships between the fine fraction void ratio and liquefaction strength were observed. In this paper, we added Tohoku silica sand (D₅₀=0.67mm), which has larger coarse grains than Toyoura sand. As a result, we found it impossible to compare soils with different maximum and minimum void ratios for unity estimation. The results of this study showed that it is important to revise the index that describes the state of sand based on its grain size and fine fraction content. It also became clear that, for the sand used in this study, the skeleton void ratio and skeleton relative density are well correlated with the liquefaction strength.