Danger Analysis and Prevention and Control Technology of Strata Pressure Bump Occurred in Coal Pillar Zone of Deep Mine

In order to effectively prevent the strata pressure bump occurred when No.3below322 coal mining face passed through coal pillar zone in No.3upseam, a theoretical analysis, engineering analogy and other methods were applied to a study the mine strata pressure bumping danger of the coal pillar zone and the preventi on measures in combination with a micro seismic monitoring and measuring and fine coal inspection data. The results showed that under comprehensive influences of a mining depth, coal pillar, mining operation and other factors, the solid sidewalls of the transportation gateway in the coal pillar area was a danger area of the mine strat a pressure bumping. During the mining and pushing forward process of the coal mining face, a micro- seismic event was abnormally distributed. The cutting value ofa b orehole drilling was 1. 6 times higher than the designed coal cutting value. The pressure released with intensive seam boreholes in advance of 60 m in the danger zone could effectively prevent the mine strata pressure bump occurred. The practices showed that with the analysis on the mine strata pressure bump danger in the coal pilla r zone and the pressure released with the advance intensive seam boreholes conducted, the coal mining face with a successful passed through the coal pillar zone coul d be ensured.