Abstract: In order to explore the influence of different blind drainage ditch layout on the seepage and stability of tailings dam.Taking a tailings dam as an example in this paper,the seepage field,pore water pressure and stability of the dam body are simulated and analyzed in five types of drainage patterns: without blind ditch,horizontal blind ditch in the tailing silty sand,vertical and horizontal blind ditch in the tailing silty sand,horizontal blind ditch in the tail silt soil,vertical and horizontal blind ditch in the tail silt soil.The results show that the type of vertical and horizontal blind ditch in the tail silt soil has the greatest influence on the depth of phreatic line and safety factor of dam body.And the influence of different layout patterns on seepage and stability of tailings dam are compared.It can provide a reference for drainage design of a tailings dam.

Key words: Tailings dam, Blind drainage ditch, Seepage, Phreatic line, Stability