Abstract
Crushed granular materials have been considered as different materials compared with original one, which can be described by new compression parameter and peak stress ratio. Based on experimental results, the movement laws of compression line and critical state line of the original and crushed granular materials were investigated in this paper and two basic formulas were given: one formula describes the relationship between compression parameter/rebound parameter and broken indexes; the other formula describes the change about stress ratio at critical state when grain crushing occurs. A constitutive model is proposed by combining the above two formulas and the unified hardening model. The new model can not only consider particle crushing, but also describe shear dilatancy, strain-hardening and softening. In addition, the validity of this new model was confirmed by test data.
