Stability Analysis of Tailings Dam under Muddy Water Infiltration

Abstract

Tailings dam is an important control project of mine safety, once the instability, the greater harm. Tailings dam seepage damage is the main reason about tailings dam safety accident and tailings dam seepage problem belongs to the muddy water seepage. By considering the main hydraulic factors of the seepage problem, use finite element software to analyze its seepage stability. Test the safety of dam running state and get the influence law of permeability coefficient and aquitard on dam safety. industrial buildings and is an important control project of mine safety. Data suggest that more than 90% accidents are related to water about tailings dam which mainly is the destruction of seepage. Seepage damage is one of the main causes of the tailings dam accidents. Due to higher dam saturation line, it is easily to cause slope seepage, and piping, resulting in water-saturated tailings dam slope, soft, until the dam landslide. Tailing dam is consists of initial dam and tailings stacking dam. The initial dam is one structure which support stockpiling tailings dam. Tailings stacking dam is sedimentary body in the process of slurry discharge it essentially equivalent to the sand soil slope after the hydraulic separation. The filling process of tailings dam is very long, the construction process and the production run simultaneously. If instability, great harm, ensures tailings dam safety is a key in production design. Within the suspended solids continuously deposited, penetration path and overall permeability coefficient are constantly changing (2) ; so tailings dam seepage problem belongs muddy water seepage problem. Under the influence of various mechanisms, porous medium porosity is changing; permeability coefficient and permeability paths are in a non-steady state. In this paper, taking a tailings dam in northern China as an example, consider percolation head (pore water pressure), osmotic gradient (flow rate or penetration), water seepage discharge and other factors to study he seepage stability of the tailings dam.