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通过测压孔现场实测4号煤层的原始瓦斯压力、钻孔瓦斯自然涌出量,并用刻槽法在测压点附近取样,实验室测定瓦斯吸附常数、煤的孔隙率及煤的坚固性系数f、瓦斯放散初速度ΔP等参数。依据煤层突出危险性单项指标和综合指标评价,认为川达煤矿4号煤层目前采区+1 195m标高以上不具有煤与瓦斯突出危险性。
The original gas pressure of No.4 coal seam and the natural emission of boreholes were measured on the spot through the pressure hole. Samples were taken near the pressure measuring point by means of notch test. The gas adsorption constant, the porosity of coal and the solidity coefficient of coal f, gas release velocity ΔP and other parameters. Based on the single index of coal seam salient danger and the comprehensive index evaluation, it is considered that coal seam and gas outburst danger is not found above the level of +1 195m in No.4 coal seam of ChuanDa Coal Mine.