Study On Stability Analysis And Safety Assessment Of Bayanhaer Tailings Pond

Mining of mine resources is closely related to economic development and people's living standards.Tailings dam is an important structure in mine engineering,and it is in a dynamic process.Under the action of load,seepage and earthquake,it is easy to break dam,which seriously threatens the safety of human beings and property.Therefore,the stability of tailings dam is an urgent problem to be solved.Therefore,it is of great significance to study the stability of tailings dam to avoid premature failure.Therefore,this paper systematically studies the safety of tailings dam by combining experimental research,finite element simulation analysis and field monitoring:?1?Relying on the actual project,laboratory tests on the physical properties of tailings are carried out,and the grading curve,liquid index and shear strength index of tailings are analyzed.The results show that the tailings have less water content,larger natural density and dry density,poor grading and standardized shear strength index.?2?FLAC^3D is used to analyze the stability of tailings dam,and the seepage distribution,stress distribution and displacement distribution of tailings dam under seepage,static load and dynamic load are obtained.The results show that:the seepage mode in the dam is stable,the minimum buried depth of phreatic line is within the safety index,and seepage failure will not occur;under the static load,the shear stress level and shear strain in the dam are slightly larger,and the stress in the dam slope and below is not large.The deformation of the dam body is mainly manifested by the dam body settlement,with an average increase of 1 m,the dam body settlement is about 8mm,which meets the design requirements;the dynamic load is applied to the dam Under the action of the action,the maximum acceleration is distributed on the dam crest and water area,and the displacement deformation is not large on the whole,which is manifested by the uplift of dam slope,subsidence of sedimentary beach and stability of dam body.?3?The monitoring scheme of dam displacement,dry beach,reservoir water level and phreatic line is designed.The tailings dam is monitored in real time to verify the calculation results of finite difference method.The results show that:the on-site monitoring results and the finite difference method calculation results have high similarity,and the simulation results in this paper are true and effective,which lays a theoretical foundation for the safety assessment of tailings dam.?4?Based on the calculation results of finite difference method and field monitoring results of tailings dam,combined with limit equilibrium method and static equilibrium method to calculate the safety parameters of soil,the main components of sample parameters were extracted,and the PCA-AGA-KELM model model was established to evaluate the safety status of tailings dam.The results show that:the safety factor calculated by PCA-AGA-KELM model meets the requirements of the code,and the overall structure of the tailings dam is in a safe state,and the safety factor obtained by this method is similar to that obtained by Bishop method and Sweden circle method,which has certain theoretical value and provides reference for safety prediction in tailings pond engineering.