Abstract: Seepage field is an important factor, which affects the safety of tailings dam.And how to reduce the dam seepage line is the key point of the tailings dam safety management.Taken the Zhejiang Longquan tailings dam as an example, through the simulation the seepage field of tailings dam, seepage line of numerical simulation results were compared and verified with the traditional formula method's result to determine of the dam seepage line.Finally, the radiation well drainage technique was used, and it achieves the desired effects.

Key words: Tailings dam, Seepage analysis, Radiation wells, Design