Abstract: The upstream construction method of tailing dams uses the tailings in the reservoir to construct the later-period sub-dam.As the tailings in the reservoir is in under-consolidated state and has low density and loose structure during the mine production period, it is very sensitive to seism and very easy to liquefy due to seismic effect, leading to the instability of dam body.In combination with a research project of a tailing dam adopting upstream construction method, the impact of after-shock on the stability of tailing dam is analyzed, with the results being reference to the seismic design of similar tailing dam projects.

Key words: After-shock, Tailing dam built by upstream method, Liquefying, Stability