Study of damage viscoelasto-plastic dynamic constitutive model of rock materials

For the dynamic mechanical properties of the rock materials, based on the statistical damage theory and constitutive model theory, the rock can be classified as a heterogeneous material which is made up of damage element, elastic element, plastic element and viscosity element. Consequently, based on above theory, the damage viscoelasto-plastic dynamic constitutive model of rock materials are constructed. Then, based on the data of dynamic impact test of rock, the characteristic parameters of dynamic constitutive functions of granite and concrete are ascertained by the inverse analysis method which is programmed by embedding the Nelder-Mead method in basic adaptive genetic algorithms by coding in real number. The result illustrate that stress-strain curve and experiment curve, which are both come from dynamic constitutive model, have a great consistency. Consequently, the applicability of damage viscoelasto-plastic dynamic constitutive model has been verified.