The Reserved Column Of Maanshan Iron 3 ~ # Ore Body Stope Structure Parameters Optimization Research

Sublevel Drilling and Stope Mining Method, applying to the steeply inclined ore body of the medium solidness and higher in the mined ore and surrounding rock, has the features of the intense recovery, high productivity, low costs, safe operations, and etc.. In recent years, the Method has been widely accepted, and applied in many thin ore bodies of iron ore.No.3ore body of Maanshan Iron Mine belongs to a solid steeply inclined ore body, its dip angle is at50°by the dip direction of N35-40°W, it falls to the southwest by the dip angle of50°to70°, and its average level of the thickness is8.11m. The ore body is264m along the strike direction,50-84m dip direction, and750-810m output elevation. The Study applied the Sublevel Drilling and Stope Mining Method laid along the strike directions, which includes the stope parameters of40m×50m×8m, the top column thickness of5m, the pillar thickness of10m, and the between column of8m. Through the preliminary calculation, the integrated recovery rate is78.4%. Under the conditions of the set mining method, reasonable mining structure parameters play a vital role to improve the overall economic benefits of mine and the recovery rate of ore.After the careful study of the mine geological report, combining with the actual situation in mine, the paper gives estimation on the rock mass quality classification indicators and makes calculation upon the mechanical parameters of rock mass by the Hoek-Brown criterion. To find out the way to optimize the stope structure parameters, the study makes the simulation analysis by using the ANSYS Numerical Analysis Software, and it finds out that there is the stress concentration in the middle area of the goaf and inter-column after the analysis of the stope stress, displacement and strain of the mine and also the stress distribution of the goaf. Furthermore, to enhance the stability of the stope, the study takes the reserveing horizontal pillar in stress concentration of goaf areas method to enhance the stope stability, and its analysis shows that the reserved lateral pillar method can indeed distribute the stress concentration of the goaf, and gives auxiliary support to the top pillar and inter-column of the stope. Moreover, if it lengthens the stope length by10m, the ore room will be in an instability state, the maximum tensile stress and shear stress exceeding the tolerance limits of the ore body, and the stress and displacement of the stope is in a safe state after an added pillar simulation. It proves that, by the reserved horizontal pillar method, the mine structural parameters of50m×50m×8m is fit for the mine, and at the same time, the ore recovery rate increases from78.4%to83.18%.The study shows that the reserved horizontal pillar approach can enhance the stability of the stope and improve the resource recovery effectively by lengthening the stope length. Simultaneity, the result provides a reference for the similar mine.