Test of orthogonal numerical simulation on structure parameters of underground stope in rock material quarry

Currently，open-pit mining of faced stone material deposits is facing a series of problems，from vegetation destruction and environmental pollution to high and steep slope with the risk of potential geological hazard，lots of stripping and mine closure because of economic stripping ratio close to pit-limit stripping ratio.In order to effectively develop the stone mineral resources，it is necessary to carry out the research on the underground mining technology of stone resource，especially the structural parameters of underground stope.With an underground marble mine as the engineering background，the influencing factors of stability of the underground stope and their sensitivity were analyzed by means of the multi-index comprehensive evaluation，the numerical simulation and the orthogonal experiment.And on this basis，the stope structure parameters were optimized.The results showed that the span affected the stability of stope very much，the height and roof thickness less，and the pillar width the least.The optimized structure parameters，with span 8 m，roof thickness 6 m，height 16 m and pillar width 6 m，of underground stope were obtained for an underground marble mine above.The research results can provide a useful reference for the design of structural parameters of underground stope in similar stone mines.