Abstract:In order to study the influence of uniaxial cyclic loading and unloading paths on rock failure modes and extent, the peak strength and modulus of elasticity of single shaft cyclic loading and unloading are studied; collection of marble under uniaxial cyclic loading and unloading destructive debris, and debris of different sizes within the scope of the analysis and calculation of fractal. The results show that the debris after cyclic loading and unloading is characterized by strip shape and strip shape, and the strip, block and plate characteristics are weakened; The smaller the fractal dimension is in the three directions of the length, width and thickness, the more easily broken rock, the greater the degree of damage; The failure modes of cyclic loading and unloading of rock are mainly longitudinal splitting, and there are few shear failure; Cyclic loading in a certain extent of rock strength to strengthen effect, strengthen the effect of cyclic loading was applied to small marble strength significantly increased the extent of damage is reduced; the strengthening effect of cyclic loading was applied on the marble strength greatly weakened, damage caused by the more significant the damage greater.