A series of drained triaxial compression tests at extremely low pressures was performed on saturated samples of fine, angular sand to know the dependency of both the angle of internal friction φ=arcsin {(σ
1'-σ
3')/(σ
1'+σ
3')}-<max> and the deformation characteristics on the value of σ
3'. Great cares were paid to the stress measurements and the stress corrections for membrane forces. Also in order to confirm the results with respect to the value of ψ, several analyses based both on the stress-dilatancy relations at failure and on the deformation characteristics of sample were performed. It was found that the change of φ with the change of σ
3' is very small when σ
3' is lower than around 0.5 kgf/cm
2 (50 kN/m
2), especially lower than around 0.1 kgf/cm
2 (10 kN/m
2). It was also found that the apparent cohesion intercept is not needed in using the Mohr-Coulomb failure criterion for the saturated sand tested. Further, it was found that the change of deformation characteristics of sand with the change of σ
3' is rather small when σ
3' is lower than around 0.5 kgf/cm
2 as well.
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