Abstract: The similarity between the spoilbank operated by the sixth truck team in Gongchangling Mining Company and other existing spoilbanks was compared in terms of lithology， structure， natural environment， dominant factor of deformation and developmental stages. The physical and mechanical parameters of granular media， halfcompaction body， compaction body and bedrock in waste pile were determined. FLAC3D was used to simulate and analyze the slope stability of spoilbank， and it was compared with the slope stability coefficient obtained by Bishop method and Janbu method. The results showed that the first terrace slope is unstable， and the existed potential slip band is at a distance of about 13m away from the slope edge. The second terrace slope is stable， and its limit dump height is 108m. There are safety problems when the limit dump height is reached， therefore， reinforcement measures are needed.

Key words: spoilbank, slope, stability, FLAC (fast Lagrangian analysis of continua), the limit dump height