Mine Strata Pressure Behavior Law of 12511 Fully-mechanized Coal Mining Face in Bulianta Coal Mine

To study the behavior law of ground pressure in the extremely high mining face of near shallow buried seam, the 12511 fully mechanized mining face of Bulianta Mine was taken as the research object, through the measured data of the rock pressure of the working face, the law of strata behavior in 7.4 m super large mining height working face is analyzed. The results show that the distance of first weighting is 44 m, cyclic pressure distance during initial stage of mining is 11.74 m, and the interval of mid-mining cycle increases to 14.1 m, and the working face periodic weighting has a strong and weak alternation law on the support strength. Periodic compressive strength presents the characteristics of “small ends, large middle”. The dynamic load coefficient of periodic weighting of working face is 1.39. The working resistance of the support is normal distribution, showing a good working state.