Abstract: The node virtual flow method is used to calculate the groundwater seepage on the northwest side slope of the tailing pit reconstructed from the Aoshan pit;According to the limit equilibrium method,considering the change of water level in the pit and the softening phenomenon of longterm submerged rock mass,the stability of the slope on the northwest side of the pit is discussed.The results show that when the water level rises no more than 1.7 m and the water level falls no more than 0.5 m,the slope stability of the longterm submerged rock mass does not change much;However,the softening of the rock mass will reduce the longterm stability of the slope.The research results have certain reference value for similar slopes.

Key words: ground water seepage, change of water level, softening effect, slope stability