Stability Analysis Of Tailings Dam Under The Action Of Muddy Water Infiltration

According to the fact that tailings particles deposit effecting on infiltration process are mostly ignored in the stability analysis of tailings dam under seepage action in recent years, combining with example, using theoretical analysis by combination of numerical analysis, using FLAC3D finite difference software , simulating the deformation and stability of tailings dam at the different exuding position, obtaining that high and low of saturation line is an important influencing factor of tailings dam stability under the action of seepage: the lower the saturation line, the higher the safety factor of tailings dam, dam tends to be stable. The main content of the paper as follows:(1) When the velocity is less than the deposition rate, the dynamic provided by flow is less than the resistance provided by gravity and van der waals force, tailings particles deposit; the deposited tailings particles changes the physical parameters of porous media, increasing the whole saturation line of tailings dam, resulting in the increase of dam body moisture content and severe, shear strength reduced, thereby affecting dam stability;(2) Carrying out water seepage and muddy water seepage laboratory test respectively, as the deposition of tailings particles, the porous medium skeleton porosity and permeability coefficient of tailings dam are changed, in which permeability and porosity decrease with time by non-linear, but little change in the water seepage;(3) Based on laboratory test results to establish the dynamic model of tailings dam material parameters (porosity and permeability coefficient), and study of the mechanistic of tailings particles deposit, establishing the fluid-solid coupled mathematical model of tailings dam under the action of muddy water seepage, and to solve them;(4) The paper analyses the force condition of tailings particles in the porous media solid skeleton of tailings dam; uses laboratory test of muddy water seepage and numerical simulation of stability analysis of tailings dam to study; and furtherly studys the mechanistic of muddy water particles deposit bringing about saturation line increase which effects on whole stability of tailings dam.