Energy-based elastoplastic damage model for rock materials with strain rate effects

Researches of dynamic constitutive models for rock materials are the base of theoretical researches of rock dynamic mechanics. Comparing with other nonlinear theories, the damage mechanics proved that it can successfully simulate strain softening and being gradually destroyed of rock materials, and explained its dynamic or static destroying mechanism. The existing dynamic constitutive models which are from theoretical derivation mostly ignore damages, while from experiments are short of damage mechanics theory. Basing on equivalent elastic complementary energy theory and basic concepts of damage mechanics, combining with dynamic experiments, an elastoplastic damage model for rock materials with strain rate effects is established. Comparing with experimental dates in literatures, the validity of the model is proved, so as to found the bases for dynamic response researches of rock material structures.