Abstract: The surrounding rock in the copper mine analyzed has good stability, and the buried depth ofthe orebody is shallow, with a buried depth of 152 -203 m. In order to ensure stability of the surface , theinfluence of underground mining on surface was simulated by FLAC3D. At the same time, the effects of thephase-by-phase excavation and filling of the underground orebody on the stability of the stope and the surface are calculated and analyzed, Simulation results show that strata movement is a dynamic process ottransfer from bottom to top, and the underground orebody adopts the “subsequent filling”method, whichcan effectively reduce the deformation of surrounding rock and surface subsidence, and subsidence deformation of surface is very small, which is only 1.8 cm, meanwhile the surface does not produce the plasticdisturbed zone, which illustrates the surface in a stable state. The research results provide theoretical basisand technical guidance for safe and efficient mining of the deep ore body and stability of surface.

Key words: underground mining, pillar, stability, surface, subsidence deformation