Study on Surrounding Rock Stability of Mine Large Bunker Chamber Under Mining Influences

Due to the mining activities of No.2202 coal mining face in Hebi No. 8 Mine affected to the safety application of the coal bunker, the similar material sim ulation experiment, theoretical analysis and the site actual measuring method were applied to the analysis on the reasons affected to the surrounding rock stability of th e coal bunker chamber under mining influences. The strata movement law above the coal bunker, the abutment pressure distribution law at the two sides of the coal min ing face and the self deformation law of the coal bunker were obtained. According to the deformation observation results of the coal bunker chamber, the conclusion acc uracy of the similar material simulation experiment was verified. The study results showed that S13 sandstone above the seam was the key stratum to control the surro unding rock deformation of the coal bunker. The width of the abutment pressure zone along the two side coal walls of the coal mining face was far over a normal value and was 80 m. The max deformation was occurred at the top-port of the coal bunker, the side shoulder at the dip head and the bottom-port. Slight failure would be 0CCu rred at above parts. But the safety application of the whole coal bunker could be ensured. After four to six months of the coal mining operations, the surrounding rock de formation of the coal bunker was in an active period.