2010 Volume 66 Issue 1 Pages 215-225
A series of undrained triaxial tests was performed on sand and natural clay mixtures with various fines content. The boundary of the area where sand formed the structural skeleton and the area where clay composed the matrix was examined. The consistency changed drastically on the boundary of fines content about Fc=20%. The comprehensive undrained shear strengths were presented for materials from sand to clay with various fines content. Although the strength was varied depending on their void rario even if the fines content was indentical for the material in which sand forms skeleton, a unique undrained strength dependent on fines content was observed in material where clay formed the matrix. A unique relationship between equivalent granular void ratio and undrained strength and steady state strength were confirmed for the material which has sand skeleton.
