The results of drained triaxial compression tests and DEM simulations of sand-rubber mixtures presented in the literature were analysed using of frictional state concept. The stress-plastic dilatancy relationship at different shear stages can be approximated by straight lines determined by critical state angle and two parameters of the frictional state concept. The points representing failure state lie on the frictional state line as for pure sand without rubber. The frictional state concept can be used to simply describe the stress-dilatancy relationship of various sand-rubber mixtures.