Stability Analysis Of Linongdagou Tailing Pond In Yangla Copper Mine

The tailings pond is an extremely important mining structure.Its main purpose is to collect and accumulate tailings waste after beneficiation treatment.There is a danger of dam break.Once it is wrecked,it is easy to cause serious safety accidents and environmental ecological disasters.Therefore,the stability analysis and evaluation of the tailings pond is a very important task.This paper takes the Li-Nong tailings pond of Yang-La Copper Mine as the research object.Based on site investigation,site and laboratory tests.The finite difference method is used to study the stability of the tailings pond under static and dynamic loads.The paper achieved the following main results and understanding:(1)Using particle analysis test,triaxial undrained shear test,standard penetration test,medium shear test,drilling shear wave velocity test method,sand sample routine physical and mechanical test,etc.The physical and mechanical parameters of the dam foundation rock and tailings sand and the accumulation law of the tailings sand were obtained.(2)Static analysis results: According to the finite difference method of rock and soil fast Lagrangian method,the Li-Nong tailings dam section and three-dimensional finite element calculation model are established,and the numerical simulation of the current stacking elevation is carried out.The stress field and displacement field under different stresses are simulated by the strength reduction method and the point safety factor method.The results meet the requirements of safety and stability.The simulation results are consistent with the actual photo cracks.Small displacement changes are likely to occur near the initial dam.(3)Dynamic load analysis results: Through the monitoring point setting,the dynamic load analysis model under two seismic wave intensities is established by time history analysis.The overall displacement cloud map is compared by detecting the displacement of the point and the response acceleration.Meet safety requirements.The surface of the tailings is prone to small displacement changes,and the area of the point with low safety factor is not formed into a strip shape.(4)After the dynamic load is applied to the tailings pond,the deformation has different forms on the two waves: Generally,there is a displacement movement in the upper part of the stacking dam,and a small displacement change on the side of the air.However,the amount of deformation is very small.When another type encounters the peak of the seismic acceleration,there is also a change in the amount of change in the displacement.