Effects of deviatoric stress ratio and intermediate stress parameter on deformation behaviors of dry sands under principal stress rotation

Two groups of tests of unidirectional rotation of the principal stresses are conducted on dry Fujian standard sand by means of the dynamic hollow cylinder apparatus at Tongji University. The investigation highlights the influences of deviatoric stress ratio and intermediate stress parameter on deformation behaviors and non-coaxiality of dry sands. The mean stress and intermediate stress parameter are maintained as constant with a variation of deviatoric stress ratios in one test group, while the mean stress and deviatoric stress are maintained as constant with a variation of intermediate stress parameters in the other test group. The experimental results show that the deviatoric stress ratio and intermediate stress parameter have significant influences on deformation behaviors of dry sands.