STEADY STATE AND LIQUEFACTION STRENGTHS OF CRUSHABLE SOILS

A series of monotonic and cyclic triaxial tests was performed on two decomposed granite soils and a volcanic soil “Shirasu” which are typical crushable soils in Japan. Both contractive and dilative monotonic shear behaviour were observed depending on the confining stress and initial relative density. The cyclic shear strengths were also dependent on the confining stress. The monotonic and cyclic shear behaviour were compared each other to find the mutual relationship. It was found that there is a unique relationship between the cyclic shear stress to cause liquefaction and the monotonic shear strength of phase transformation independent of the difference of soils, initial densities and confining stresses which is useful for estimating the cyclic strength by the static strength.