A characterization method for equivalent elastic modulus of rock based on elastic strain energy

Energy is an internal variable during rock deformation and failure, its dissipation conversion law can reflect the rock’s damage deterioration state. Analysis of failure process from perspective energy helpful to deeply understand mechanism damage, fracture instability has important theoretical practical significance for stability evaluation support control surrounding rock. In this study, through single cyclic loading unloading (SCLU) experiments, triaxial (CTLU) experiments conventional compression (CTC) equivalent elastic modulus method based on strain proposed analyze The results show that error calculated by formula generally higher than 10% with secant tangent curve as input parameters. Taking in study parameter, more accurate be obtained formula. During process, shows a three-stage characteristic increase, steady decrease. estimated quadratic function between confining pressure axial strain. Under same deviatoric stress, stored increases increasing pressure. local maximum rate corresponds stress drop, peak appears near strength. High mainly occurs short time after strength, release are sudden severe under high