Abstract: Taking the underground mining blasting activity of Dayanpeng Copper Mine as the re⁃ search background，the influence of underground mining blasting operation on the stability of adjacent tail⁃ ings reservoir is systematically evaluated by combining Sadaovsk empirical formula with FLAC3D numerical simulation nonlinear dynamic analysis.By analyzing the variation law of key physical quantities such as par⁃ ticle peak vibration velocity and acceleration，the influence of underground blasting vibration on drainage wells，flood discharge tunnels，tailings dams and adjacent villages near tailings reservoirs is comprehen⁃ sively evaluated.The results show that the blasting vibration wave decays exponentially with distance in the range of 40~120 kg，and the peak vibration velocity of each facility is lower than the safety threshold of ‘Blasting Safety Regulations'（GB6722—2014）. The surface acceleration of the adjacent village is also lower than the human comfort limit，and the residents have no significant sense of shock.Therefore，within the scope of the blasting charge，the stability of the surface facilities in the mining area is in a safe and controllable state，which meets the requirements of the specification. The research findings have guiding significance for safe mining operations and tailings dam management.

Key words: blasting vibration, tailings pond, stability analysis, numerical simulation