Abstract: Take the working slope of Antaibao open-pit mine as an engineering background, the evolution law of global stability of surface mine working slope affected by toe of slope disturbance is simulated by FLAC^3D. The results show that compressive stress of surface mine working slope after affected by toe of slope disturbance is showed gradually decreased on direction of X and Z, and tension stress zone appeared in local zone on direction of X; the effect of uniform toe of slope disturbance on global stability of working slope is showed nonlinear; the property of tensile strain is showed on direction of X in surface mine working slope, and tensile strain will increase as the increase of toe of slope disturbance; compressive strain is mainly on direction of Z, but tensile strain will appear in local zone of toe of slope on direction of Z, too . Slip deformation is most easily to occur in the tensile strain area of toe of slope.

Key words: Slope, Disturbance of slope toe, Global stability, Numerical simulation