Study on Energy Evolution and Damage Constitutive Model of Sandstone under Cyclic Loading and Unloading

In order to strengthen disaster prevention control under deep resource development and space utilization, it is necessary construct a damage intrinsic model complex stress states predict the mechanical behavior of deep-rock mass cyclic loading. An indoor uniaxial loading test on sandstone was carried out in this paper. By analyzing properties energy transformation failure process, assumed that rock micro-units follows Weibull density function, relationship constructed using Mogi–Coulomb strength criterion. The constitutive rationality verified via nonlinear fitting experimental curve theoretical curve, parameters were analyzed. This study indicates procedure has strengthening effect elastic modulus. brittleness increases with cycle amplitude, axial strain accumulates continuously, hysteresis loop area gradually moves right. conversion process mainly split into storage phase before release at time damage, dissipation percentage shows groove evolution law. based criterion accurately reflects ontological loading, have clear physical significance. important engineering meaning for predicting deformation destruction rocks.