Abstract:This paper focuses on the dynamic seismic analysis of a tailings dam. Firstly, based on the geological conditions and engineering characteristics of tailings dam, the dynamic analysis model of the tailings dam was established. Then, the dynamic response of tailings dam under seismic action was calculated and analyzed by the time-range analysis method. The results show that the maximum horizontal acceleration response value of tailings dam is small and has limited influence on the overall stability. The dynamic shear stress decreases with increasing elevation, and the maximum value occurs at the bottom of the initial dam foundation, while the dynamic shear stress of other soil layers is low and no shear damage occurs. The liquefaction area is small in scope and has little effect on the stability of the dam. Seismic dam slope stability analysis shows that the safety coefficient of the most dangerous slip arc of tailings dam is always greater than 1.05, indicating that the dam body maintains a safe and stable state. The permanent deformation analysis shows that the maximum permanent deformation of the tailings dam is 0.11 m, which is lower than 1% of the dam height, and does not pose a threat to the safety and stability of the dam.