The drained triaxial compression tests were performed on uniformly graded gravels. The applicabilies of Mohr-coulomb, non-linear and internal friction angle equations are examined and the relations among each coefficients in the equations are considered. The following results are obtained.
1) Mohr-Coulomb equation is accord with experiments in the range of σ3=1.0-4.0 kgf/cm2 but overestimates shear strength in comparison with experiments in σ3≦0.5 kgf/cm2 and σ3≧6.0 kgf/cm2.
2) The non-linear and internal friction angle equations are in accord with experiments in σ3=0.5-6.0 kgf/cm2.
3) There are no good correlation between dry density of gravels and the coefficients of the equations.
4) The good correlations are obtained among basic shear strength τ0 and the coefficients of non-linear and internal friction angle equations.
5) The coefficients of non-linear equation A and b have good correlation with that of internal friction angle equation φm and a.
Key words: Shearing properties; graded gravels.