Research On Structural Parameters And Stability Of Underground Stope In Stone Mine

With the increasing of China's stone produc tion and sales,stone mines suitable for open-pit mining are gradually reduce,while underground stone mining gradually rise.However,there are not clear norms and reference of the reasonable stope structure parameters for underground stone mining by far,which seriously restricts the development of stone underground mining industry.Therefore,the research on the structural parameters and stability of the underground stone mining stope has a great significance to improve underground mining of the stone industry,ensure the safe,efficient and economical exploitation of underground mineral resources,reduce the occurrence of underground mining disaster accidents and compile specifications of underground mining structure parameter.In order to obtain the reasonable parameters of the underground stone mine,this thesis determined the span of the stope,the thickness of the roof,the height of the stope and the width of the pillar based on background information of the Yilong underground marble decoration stone mine,geological conditions of the stone mine and physical and mechanical parameters of the ore and rock by theoretical calculation and analogy method.And then the stope structure parameters were deeper optimized by the application of FLAC3 D software and orthogonal test method.Roof displacement,floor displacement,maximum compressive stress,maximum tensile stress,plastic zone volume and ore recovery were selected as the six evaluation indexes of orthogonal test.With this six evaluation indexes,the comprehensive indexes evaluation of the factors affecting the stability of goaf and sensitivity analysis were conducted.The results showed that the stope span had the greatest influence on the stability of the stope,the stope height and the roof thickness had the second effect on the stability of the stope,and the pillar width had the least effect.This analysis of orthogonal simulation recommended to use 8m for stope span,6m for roof thickness,16 m for stope height and 6m for pillar width.These structu re parameters can ensure the safety of mining,and this study can provide reference for structural parameters design of underground stone mining.