Damage Constitutive Model of Rock Based on Drucker-Prager Criterion

To overcome the shortcoming of the existing method to establish the damage constitutive model of rock,i.e.,it seeks parameters in the constitutive model by linear fitting after logarithmic transformation to result in a complex calculation and not to fit for computer programming,formulas of calculating the parameters in the constitutive model were given by introducing the characteristic parameters of the stress-strain curve of rock and taking the extreme conditions for the stress-strain curve of rock into consideration.As a result,a new constitutive damage model of rock can be easily established.Comparison with the result of triaxial compression tests shows that this model can reflect well the relationship between stress and strain of rock.Through a discussion on parameters m and F0 in the constitutive damage model,it is believed that m and F0 represent the brittleness and strength of rock respectively,and elastic modulus of rock is a co-reflection of the two parameters.