Abstract
In order to determine the regional prediction gas content critical value of 3# coal seam in Sangshuping NO.2 Mine, according to the mine’s gas geological conditions, the gas geological units in the investigation area was analyzed and determined. The minimum firmness coefficient f min, the initial gas release rate ΔP, and the volatility of coal Vdaf were measured. The outburst empirical formula was used to calculate the minimum gas pressure at which outburst occurred, and then the critical value of gas content was obtained. At the same time, the three-rate analysis method, the correlation analysis of gas content and prominent omen were used to comprehensively determine the critical value of gas content in the normal area of 3# coal seam is 9m3/t in normal area, 8m3/t in geological anomaly area, it provides a scientific basis for regional outburst prevention in the mine.
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