Influence of Bauxite Pillar to Room Ratio on Stope Stability
A Bauxite in Shanxi Province belongs to sedimentary type and is mined by room-pillar method.Reasonable design of stope parameters is the key to balance the relationship between ore recovery rate and stope stability.Based on the actual geological mining conditions of the mine,the stope stability of three mining schemes with different pillar to room ratios(1∶1,1∶1.5,1∶2)was compared and analyzed with the method of theoretical analysis and numerical simulation under the premise of the fixed pillar width of 4 m.The results showed that with the increase of room width,the peak value of vertical stress of pillar gradually increased and stress concentrated inside the pillar,and the displacement of roof and floor and the plastic failure zone also increased.The pillar to room ratio 1∶1.5(the pillar width was 4 m and the room width was 6 m)was the optimal ratio,which can maximize the ore recovery rate and ensure the stability of stope.It can provide theoretical support for the safe and high-quality development of bauxite in Shanxi Province.
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