Three Dimensional Statistical Damage Constitutive Model of Rock Based on Griffith Strength Criterion

According to the damage mechanics theory and Lemaitre strain equivalence theory, because most rock materials are brittle materials, Griffith strength criterion has good applicability describe fracture failure of from perspective energy. Using a new method micro-element based on criterion, assuming obeys Weibull distribution, true triaxial constitutive model softening reflecting whole process is established. On this basis, influence two parameters in curve analyzed, relationship between intermediate principal stress established, revised reasonably. Finally, The results agreement with experimental curve, which verifies its validity rationality. At same time, evolution discussed, size analyzed detail.