Abstract: Taken some mine as an engineering example, and based on the basis of examining the engineering geology environment, numerical analysis the stability of the waste dump by FLAC. Accumulation in the process dump, the maximum principal stress difference at dumping height with the increase of increasing regional rock and soil damage; reach the final row of the design altitude, soil and within the rock dump and soil within the shear generated gravity consolidation of plastic damage, destruction had the shear slip surface.

Key words: In-pit waste dump, Stability Analysis, Open-pit mine