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| Drilling Bits Method Application in Monitoring Impact Ground Pressure Hazard of Coal Seam |
| ZHANG Dong-dong, ZHAO Gang, YU Hai-yang, LI Hai-zhou |
| Dongtan Mine, Yanzhou Mining Group, Zoucheng 273512, China |
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Abstract 143上16 working face of Dongtan Mine was taken as experiment site, drilling bits method application was used to monitor the impact ground pressure hazard of coal seam, through the theoretical analysis and calculation, the coal seam impact ground pressure critical drill cuttings was settled as 4.25 kg/m, when unit length of drill cuttings is larger than the figure, there is possible impact hazard in the area, and when there is impact sound or pipe-sticking at the same time, there is possible impact hazard in the area.
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