Study On Stability Of Tailings Dam Considering Permeability

Tailings dam is an artificial soil mix to form the slope, due to the complexity of material structure of tailings dam, easily happened geological disasters. Tailings slope stability analysis is an important subject in geotechnical engineering.On the basis of field investigation and and laboratory analysis, combined with the reservoir engineering geological conditions, deposit law, underground water level, earthquakes on the basis of comprehensive investigation and analysis, put forward the penetration effect of the slope stability of the tailings, using the FLAC3D streaming-solid coupling simulation of displacement, and take equilibrium method is used to verify the influence of the penetration to the tailings slope stability. The main conclusion and research results are as follows:1. Natural conditions of the reservoir, stratigraphic lithology, hydrogeological conditions, geological structure, earthquake and physical and mechanical properties of the deposit are directly or indirectly affects the stability of the tailing dam.2.The stability of the tailings dam depends mainly on the deposit law of tailing deposit, the burial depth of the underground water level, earthquake and man^-made factors. along the vertical direction, with depth increasing accumulation of smaller size of an overall trend, along the horizontal direction, the farther from the outfall, Smaller particle size; embedded depth of groundwater of tailings is shallow, poor stability; The main force of the earthquake occurred so that tailing deposit liquefaction, so reducing the physical and mechanical properties, the impact of stacking stability; man～made factors mainly aims at the management of the tailings and deformation monitoring.3.using the FLAC3D to analysis under the action of penetration and no tailings penetration under the action of fluid～solid interaction of simulation,and analysis of the displacement size, two kinds of the result was compared with the actual testing displacement, it is concluded that under the effect of penetration of displacement is closer to the actual displacement, penetration have an impact on the stability of the tailings. 4.According to the engineering geological conditions of the tailings and the assumptions model is derived under the action of seepage force of tailings dam safety coefficient expressions, Using the limit equilibrium method to calculate under the action of Penetration and no penetration under the action of safety coefficient, The analysis results:Bishop method and Jane method to calculate stability of under the action of penetration coefficient K are:1.648,1.641, and not to consider the stability of the penetration coefficient K are:1.900,1.903, Water penetration affects the stability of the tailings, as can be seen in the process of calculation not only increased Decline in soil strength in force, and reduced the soil sliding resistance; With0.2m higher Add underground water levels for gradient, and computing the stability coefficient of tailings dam, the influence of water level change on the stability.Comprehensive available:water penetration effect increased the soil down force, reduced the soil sliding resistance, thereby reducing the stability of the tailings coefficient, and the underground water level is higher, the lower the stability of the tailings...