Modeling and Experimental Validation of Rock Resistivity Evolution During Deformation up to Failure

Abstract. Modeling the evolution of rock resistivity during deformation up to failure is important for using resistivity to evaluate rock engineering properties related to rupture. In this paper, pores are classified into three types—elastic, perpendicular plastic, and parallel plastic pores—based on the evolution of pore geometry characteristics during rock fracture and the differing contributions of pore morphology to rock conductivity. In addition, a three-porosity rock resistivity model was established by incorporating Archie’s formula. Based on the changing characteristics of the three types of rock pores under loading conditions, a pore volume evolution model under triaxial loading was derived using statistical damage theory. By combining the pore volume evolution model with the three-porosity rock resistivity model, a model for the evolution of rock resistivity during the triaxial loading rupture process was developed. Finally, the validity of the model was verified through experimental tests, and the influence of confining pressure on the model parameters was analyzed according to the test results.