Abstract: In order to find the influence of surface dry-tailing stacking to underground mining，a three-dimensional model for Yuhuasi Mining Area was established，and FLAC3D analysis software was used to simulate surface dry-tailing stacking.The results show that surface dry-tailing stacking has almost no effect on the stress and displacement of production level but a great impact on near-surface part.More attention on and effective measures for high stress area in hanging wall contact zone of rock and ore and two ends of ore-body trend need to be taken in this mining area to ensure normal production of the mine.

Key words: Dry-tailing stacking, Numerical simulation, Ground pressure