Abstract:

The complexity degree of the terrain and irregular degree of the border need to be fully considered in stability analysis of tailings dam. Thereby we established the true 3D seepage field of the tailings. Real seepage basin of the tailings was built by using SVOffice software without generalizing terrain and boundary conditions, and the three-dimensional transient seepage fields of the last stage filling was simulated under the normal water level (427.77 m)and flood peak(434.50 m). The results show, under two different conditions, the maximum drainage amount are both 6 100 m³/d. At the same time, the infiltration surface escapes on both sides of stacking dam, and the escape range is larger on the side far away from the drainage well, which is mainly affected by the seepage basin. Initial level of the tailing has a great impact on the seepage field of damming and the infiltration surface is the highest at the beginning of damming under flood peak. According to the simulation results, five blind drainage ditches are designed, which ensures that the infiltration surface will not escape on any position of stacking dam.

Key words: tailings, three-dimensional seepage, seepage basin, damming, phreatic surface, blind drainage ditch