Three Dimensional Seepage And Dynamic Stability Analysis Of A Tailings Mine

As an important infrastructure during the operation of mines,tailings mines are directly related to the environmental safety of mines and production safety.At the same time,the stability of the dam tailings dam status,but also directly related to the tailings of the whole operation.Therefore,the analysis and prediction of the stability of the tailings dam will help to keep abreast of its operation status,and then take timely and effective safety measures to prevent and avoid the occurrence of tailings dam safety accidents.In this paper,numerical simulation method is used to simulate the seepage field changes of tailings dam under different operating conditions of dam height and different working conditions,and the results are analyzed.Based on the seepage field analysis,the seismic wave and elasto-plasticity Model and "modified UBCSAND" material model,the paper analyzes the seismic response of tailing dam under dynamic conditions and puts forward the corresponding measures.The main contents are as follows:Through extensive reading of the literature,the research progress in the stability of tailing ponds both at home and abroad is elaborated from the aspects of the tailings pond type,the current research status of the tailings pond statics,and the status quo of the tailings pond dynamics.Site survey(data collection),sampling and laboratory testing and analysis.Based on the field investigation and experimental test results,combined with the hydrogeological conditions of the tailings dam,the three-dimensional seepage model of the tailing dam is established by using MIDAS/GTS software.Three conditions of the present dam height,100m dam height and 138m dam height are selected,As well as six conditions of normal operation and flood conditions as the research object.The infiltration surface,the hydraulic gradient,the flow rate and the change of the velocity of the seepage field are analyzed.Under the condition of flood,the infiltration surface is obviously too high,the seepage volume and flow rate are bigger than the normal working condition,and the rate of hydraulic gradient change increases.As the tailing dam body rises,the infiltration line does not change much,Slope drainage measures to reduce the saturation line height plays an important role.Based on the analysis of seepage field,the dynamic model of tailings dam is established,and the response of tailings dam to earthquake conditions is simulated.The height of dam is selected,and the height of dam is 100m and the height of dam is 138m.The acceleration response,the permanent strain stress and strain and the liquefaction of the dam under each working condition are analyzed by computer.The result shows that there is a certain phase difference between the acceleration response and the elevation.With the increase of the dam body,the change of the natural vibration period of the tailings dam,under the same seismic wave,the response of the dam body is different.With the increase of dam height,the permanent deformation of the dam body under the action of earthquake load increases continuously,and tends to converge at the later stage of seismic load.Consistent with the response of the dam body,the large shearing strain of the dam mainly appears within a certain height above the tailings of the tailings reservoir,especially the shear strain at the intersection of the tailings sand and bedrock surface is large.With the increase of the dam body,the distribution of the maximum value of shear strain basically does not change,and the range of the larger value of shear strain increases and the value increases.The trend of the shear stress in the dam body is basically the same with that of the shear strain.However,as the dam body increases,the shear stress increases gradually.