Stability Analysis Of High And Steep Slope And Evaluation Of Land Reclamation Suitability In An Open Pit Mine

Mine safety has always been the eternal theme of the mining industry,and the green mine construction will also become the inevitable trend of mining development,mine safety is the premise,green mine is the purpose,this paper studies the stability of high and steep slope in mine safety and the suitability of land reclamation in the construction of green mine,which has certain practical value and guiding significance for the actual mine engineering.Based on a large open-pit limestone mine in China,this paper analyzes the stability of two typical slopes of the selected mine with the aid of FLAC3D numerical simulation software platform.The results show that:1-1’high steep bedding rock slope can maintain stability for a long time under natural conditions;2-2’high steep bedding rock slope with weak interlayer has poor stability under natural conditions,prone to slip-curve landslide,and buckling failure of rock masses.At the same time,the unstable high and steep slopes with weak interlayers are reinforced with anchor cables and anti-slide piles,and the best support forms are explored.The results show that the optimal support position of the anchor cables is located in the middle and lower slope(L_x/L=5/12),the optimal incident angle is 14°;the optimal support position of the anti-slide pile is located in the middle and upper slope(L_x/L=2/3),and the support effect of the anti-slide pile is more significant.Finally,the paper puts forward a more perfect evaluation index system of reclamation suitability,establishes the FAHP-Entropy reclamation evaluation model,evaluates the suitability of each evaluation unit of open pit mine in different reclamation directions,and gives suggestions for the final reclamation plan based on the evaluation results:the bottom platform is reclaimed as dry land or paddy field;the platform at all levels is reclaimed as forested land and shrubbery land;the slope of each step is reclaimed by combining grassland and shrub land;top platform is reclaimed as orchard.The full-text research results can provide a certain reference for slope stability analysis and reclamation suitability evaluation of similar mines.