Abstract:In order to solve the problem that the saturation line of the dam body is shallow in the safety inspection of Dexing Copper Mine tailing dam of Jiangxi Copper Co., Ltd., and ensure the stability of the dam, the reasons for the shallow buried depth of the saturation line of the dam body are analyzed firstly. Then, considering the characteristics of different drainage methods of the tailings pond, combined with the actual situation of the No.2 tailings pond of Dexing Copper Mine, the addition of large radial wells and water is proposed through the establishment of seepage finite element calculation model, it is concluded that after adding large radial well and horizontal drainage layer, the buried depth of saturation line of tailings pond is obviously reduced, the influence range of large radial well is 128~184m, the elevation phreatic line is 5 ~ 12m lower than the current situation, and the average buried depth of phreatic line is 15m, which meets the design requirements under normal working conditions, the saturation line of the dam body is controlled to be 15m deep, which effectively ensures the stability of the dam body.