Study On Slope Stability Of Dashan Dump In Tianning Phosphate Mine

China is rich in mineral resources,which is an important resource for the survival of mankind.With the need of economic development,China’s requirements for the degree of industrialization are constantly increasing,and the development of industrialization inevitably requires a large amount of energy,among which mineral resources are extremely important,and therefore need to be continuously exploited.With the increase of mining scale,the slope instability in the mining process becomes a hidden danger and affects the mining.The dump is an important part of the open pit mining process.China is the country with the largest area of the dump,accounting for about half of the total area of the mine.Yunnan is located in the subtropical monsoon climate,and there are frequent rainstorms in summer,which makes the instability of the drainage site possible.On the basis of field engineering geology survey,taking tianning phosphate mine dump in yunnan province as the research object,this paper briefly expounds the geographical location,landform and geomorphology of the mine studied.The physical and mechanical properties parameters of particle size distribution,specific gravity and limit water content of the dump were tested by taking soil samples on site and by indoor geotechnical experiments.On the basis of this paper through the Geostudio software to analyze rainfall conditions under the condition of different initial moisture content and soil under different rainfall intensity and rainfall duration to study the effect on the stability of the dump,and calculate the rain under the condition of the mine under the condition of different initial moisture content of safety coefficient,and by using numerical analysis method of qualitative analysis law of safety coefficient under the condition of initial moisture content.Then,MIDAS GTS software was used to build the geometric model of the mountain dump,and the model state of the four stages of the dump,namely,the initial stage,the middle stage and the final stage,was established.At the same time,the stress,strain,displacement and other aspects of the whole model were studied under natural conditions,and the overall stability of the dump was obtained.Finally,based on the simulation results,some feasible prevention and countermeasures are proposed for the mountain dump.