Research On The Mechanism And Scheme Optimization Of Combined Reinforcement Of Open Pit Slop

The stability of the open-pit stope slope is a major problem that plagues mine production and safety.The open-air mines form a large number of artificial slope during mining.These slopes are steep and large in angles.In addition,the mines have weak geological bodies such as weak expansion.Geological disasters such as collapsed and landslides seriously affect the production efficiency of mining and the safety of personnel.In order to ensure the stability of the slope of the field,it is necessary to start from the actual situation of the mine,comprehensively analyze the stability of the slope of the field,propose corresponding destruction mechanisms,and optimize reinforcement plans.This article uses the southwest slope of the southwest gang field of an open-air iron ore as the project research object,and comprehensively uses on-site surveys,interior tests,numerical simulation,and theoretical analysis to analyze the destruction and stability of the slope of the field.Reinforcement mechanism,optimize the design parameters of the reinforcement scheme,and select the economic and reasonable design parameters.Mainly obtain the following achievements:(1)Through on-site survey and engineering geological survey,the structural characteristics of the slope body of the southwest gang acquisition field are determined.According to the characteristics of the rock body structure and structural distribution,the engineering geological partition is performed.The basic quality levels of the rock body in each partition,combined with the Hoek-Brown strength criteria to determine the partitional rock body mechanics parameters.(2)Use MIDAS/GTS NX finite element software to establish a three-dimensional solid model of the slope of the field,and the natural state,rainfall,blasting vibration,earthquake,rainfall+blasting and rainfall+earthquake conditions under the slope of the field calculate.According to the numerical analysis results,under various working conditions,the displacement of the stope slope gradually increases,the plastic zone gradually penetrates to form a sliding surface,the stability of the slope decreases,and the safety coefficient of the slope is lower than the standard design value.Therefore,reinforcement treatment is needed for the slope.(3)The anchor cable + frame beam structure is selected to reinforce the slope 1240～1210m,effectively improve the stress strain state of the slope,improve the stability of the slope,the displacement of the slope is greatly reduced.A decrease,effectively controlled the plastic area,and the slope safety factor was increased from 1.08 to 1.32.(4)Anchoring mechanism of anchor cable+frame beam structure.Pre-stress anchor cables are tightly connected to the overall slope and stable rock formation through the frame beam and stabilized rock formation.The frame beam suppresss the deformation of the slope surface under the pulling force of the anchor cable,increasing the anti-slip resistance of the landslide body,and effectively effectively.Prevent the trend of sliding down slides.(5)Two reinforcement schemes are adopted: anchor cable + frame beam and setting wide platform + bolt.The finite element numerical simulation was used to compare and analyze the improvement effect of the row distance between anchor cables and the width of the platform on the slope of the stope,and the design parameters of the reinforcement scheme were optimized according to the engineering cost.The optimal distance between anchor cables is 5m×5m,and the optimal platform width is 12 m.