Analysis And Research On Seepage And Stability Of The Tailings Stacking Dam By FLAC3D Method

China is a country with lots of mineral resources, the mining of resources produced a large number of tailings, and most of these tailings are piling up in tailing ponds. Because of various reasons, half tailing ponds in our country have not obtained safety licenses for production, and nearly half of them are in disease, dangers, hazards or extra-service state. These tailing ponds easily occur to leakage, landslide, dam-failure, debris flow and other accidents because of the weather, local terrain and human factors, which bring great losses to people's lives and properties and the ecological environment. Therefore, the research on the safety and stability of tailings dam not only has the academic value, but also has a great economic and social benefits.Through literature investigation, the paper summarizes the present forms, types and characteristics of tailing pond, furthermore, forms, advantages and disadvantages of tailing dam are expounded, as well as the running state of tailing ponds in China. The paper describes the basic seepage theory and seepage analysis methods, and studies the factors to impacts of saturation line, such as the permeability coefficient ratio of each layer tailings in the tailing pond. The paper analyzes and compares three kind calculation methods of slope stability, which are limit equilibrium method, the numerical analysis and reliability analysis method, and finally the FLAC method is determined to calculate the dam stability. The stability and safety factor of a tailing dam are calculated by FLAC3D program; moreover, the paper studies the stability of the dam caused by exudating point height of saturation line and the slope of tailing dam downstream, and gives some suggestions on the reinforcement of the tailing dam.