Abstract：Based on Lemaitre's theory of strain equivalence hypothesis, and the influence of chemical corrosion and confining pressure coupling on rock mechanical parameters is considered. Through nuclear magnetic resonance technology and damage mechanics theory, The meso-chemical damage variables and force damage variables are introduced, and the micro-element damage conforms to the SMP criterion, the evolution equation and constitutive model of the rock chemical corrosion-mechanics coupling damage are established, and the required model parameters are obtained by the method of theoretical derivation. Based on the particle discrete element method, the parameter radius multiplier was introduced to change the size of the bonding contact between particles, so as to simulate the hydrochemical damage. The flat joint model was used to simulate the triaxial compression of the rock after hydrochemical action, and the triaxial simulation curves of the rock under hydrochemical action and different confining pressures were obtained. By comparing the theoretical curve, discrete element simulation curve and test curve of the constructed rock chemical corrosion-mechanical coupling damage constitutive model,the results show that the three curves are in good agreement and the generation and distribution of cracks in rock during triaxial compression are obtained by discrete element method.
2022, Vol. 43 
