Application Of Plastic Drainage Plate In Tailings Dam And Its Seepage Field Numerical Simulation

Tailings pond is an important part of mine operation.With the continuous improvement and rapid development of beneficiation technology,the tailings particles discharged into the tailing pond after the beneficiation of mines in our country are getting finer and finer.Fine-grained tailings have become a dam at home and abroad.A major problem faced.Plastic drainage boards are widely used in the treatment of soft foundations.In recent years,this technology has been applied in the treatment of fine-grained tailings and has achieved good results.This method can reduce the dam body’s wettability line and promote the dam body consolidation.Research on the application of this method in tailings ponds is helpful to solve the problem of safe operation of tailings dams and promote the development of fine-grained tailings dam technology.Through theoretical calculations and numerical simulation of the two methods,key analyzes of the degree of consolidation in the method of calculating the different plastic drain board or the like,and calculates a tailings dam seepage field in the case of plastic drain board play set by numerical simulation,and Analysis of influencing factors.The main work and results of this paper are as follows.(1)Based on the theoretical calculation method of single-well consolidation,the consolidation factors affecting the plastic drainage plate and the equivalent method of the plastic drainage plate are summarized,and the different circular equivalent methods and elliptical equivalent methods are calculated and calculated The effects of different factors on the consolidation of plastic drainage boards under different equivalent methods are discussed.The ellipse method can consider the size effect and shape effect of the plastic drainage board,and can more truly reflect the drainage consolidation of the plastic drainage board.The ellipse is equivalent to the circle equivalent method that takes into account the perimeter influence factor,which is relatively close,indicating that the drainage of the plastic drainage board is affected by the shape perimeter.The scope of the smearing area and its permeability and the size of the upper vacuum preload will affect the consolidation of the foundation.(2)Based on the engineering data of Lixi tailings,a finite element model was established,and the seepage field under different conditions of dry spread length and upstream slope ratio was simulated numerically.The results show that the dry spread length and the upstream slope ratio will affect the infiltration line of the accumulation dam,which should be paid attention to and controlled in mine engineering.(3)Based on the simplification of the plastic drainage plate,a tailings dam model with plastic drainage plate is established,and the seepage field of the tailing dam under different working conditions and different vacuum preload ranges is numerically simulated.The results show that the plastic drainage plate can reduce The infiltration line of the tailings dam,and the infiltration line near the upstream part of the plastic drainage board,has a relatively large decrease.At the same time,the influencing factors of vacuum preloading are studied.The setting range,setting depth,vacuum negative pressure,and the blockage of the plastic drainage plate will all have an impact on the effect of vacuum preloading.