Stability Analysis Of Heap Leaching In Certain Gold Mine Abroad

Taking certain gold mine abroad as the engineering background, to ensure safety in heap leaching production and prevent landslide hazard,based on theoretic analysis method, risk analysis and numerical simulation, systematically analyzed leaching slope stability and proposed appropriate security precautions.listed as follow:(1) Briefly introduce landslide classification and its forming reason and development.(2) On considering the trait of heap leaching, presented the reasons of leaching landslide and combined with the analytic hierarchy process (AHP) method, calculated the relative weight of the factors influencing heap leaching stability, then through analyzing the causes of failure based on the maximum sub-principle in fuzzy method, determined the risk degree in specific case study, based on which precaution and control of the leaching landslide risk was proposed.(3)This paper conducted a study of physical and mechanical properties test heap leach field bedrock, and bulk materials physical and mechanical strength parameters, and parameters of the project processing and analysis of the data base for the next step in the numerical simulation(4) Systematically analyze the leaching stability based on the widely used FLACE3D numerical simulation methods in the geotechnical engineering. Firstly, selected section of heap leaching slope, based on geological condition, established the FLAC3D model, and calculated and determined the safety factor, plastic zone, maximum displacement, maximum unbalanced force and potential landslide face considering the current leaching height. The relative results showed that the safety factor was more than1.25, which satisfy the need of the leaching stability.(5) Based on FLACE3D numerical simulation, calculated the safety factors, plastic zones, maximum displacements and potential landslide faces in various leaching slopes, which showed that at height of84m above the ground, the maximum displacement and plastic zone increased slightly, but the horizontal displacement and vertical displacement varied sharply at the height of88m; accordingly, safety factor decreased from1.28to1.14, which is less than the critical value1.25. Taking the two maximum displacements and plastic zone perforation into consideration this paper proposed that the reasonable height of leaching was84m.