Optimization Of Structural Parameters Of A Mining Site In A Copper Mine In Yunnan

In West Yunnan,one kind of copper mine is semi rigid,thin to medium thick and thick ore body,and the ore rock is semi hard to hard,and medium stable to stable,and the shape of ore body is large.And there are many problems,such as roof caving,loss and dilution in the process of mining.KT2 ore mine targeted as the research object,this paper used methods like the field investigation,laboratory test,theoretical analysis,and numerical simulation,which aimed at the existing problems in mining,to analyze and optimize the stope structural parameters of room and pillar mining,that achieved the following research results:(1)A large number of domestic and foreign documents had been consulted to understand the current domestic and foreign research status of stope structure parameter optimization;the geological conditions of the deposit were collected,investigated and studied,including:geological structure,hydro-geology and engineering geology.(2)Combining with the actual geological data,we obtain the physical properties of ore and rock through the combination of completed and engineering geological work data and laboratory experiments,and that we use strength criteria to weaken the weakened,to obtain the physical and mechanical parameters of ore rock.The study provides the basic data for the follow-up analysis.(3)The relationship between the ultimate span and the thickness of the roof is studied by using the theory of thickness-span ratio,the theory of load transfer line,the structural mechanics beam theory and the Platts pressure arch theory.With the Matlab curve fitting of ore recovery under different theories,we draw conclusions:The limit span of the mine will increase with the increase in the thickness of the top of the mine and the recovery rate of the ore will decrease with the increase of the limit span.That is to say,the mineral recovery will decrease with the increase of the roof thickness.When the thickness of the top plate is 4 m,it can ensure the safety of mining and the high ore recovery rate.(4)Combining with the ore recovery rate and the column safety factor,the minimum length of the pillar is calculated by using the shape effect theory,the size effect theory,the Lunder and Panakis pillar strength formula.The stability of the check,the edge of the pillars to take 4 meters,the distance between the pillars to take 8 meters for the best.(5)Based on the theoretical analysis results,the numerical model was established by FLAC3D software,and the rationality of the optimization results was verified by numerical simulation.The results show that the optimization results of this paper are reasonable and reliable.This paper comprehensively utilized field investigation,laboratory test and theoretical analysis,and numerical simulation to improve the stope structure,and the three-dimensional mechanical model of KT2 ore-body was constructed,and the roof stability and the rule of loss and dilution under different structural parameters are studied,to obtain reasonable stope structure parameters,and verify the rationality of the parameters.