Proposal of Empirical Equation on Phase Transformation Angle of Sandy Soils

Abstract

A phase transform angle is known to be an important parameter in the liquefaction analysis, but researches on the phase transform angle was few; it is assumed to be constant or to be proportional to the internal friction angle in the practical use. In this study, we read off phase transform angles and internal friction angles from the cyclic shear test results on sand under the triaxial condition. It is found that phase transform angles scatter between18 and 28 degrees, and the phase transform angle is strong correlation with the internal friction angle when fines content is less than 20 %. Based on findings, empirical equation is proposed in which phase transform angle is expressed as a function with respect to the internal friction angle.