煤矿局部突出预测敏感指标实验研究

为研究大众煤矿局部突出敏感指标及其临界值，在大众煤矿二₁煤层取2个煤样，处理后分为干燥煤样和湿煤样。研究结果表明:在相同压力条件下，煤样的甲烷解吸量随着平衡压力的升高而增大，干燥煤样的初始解吸量和极限解吸量均比湿煤样大，初始解吸速度也比湿煤样快；钻屑解吸指标Δh₂和K₁随着平衡压力的升高而增大，而且干燥煤样的钻屑解吸指标Δh₂和K₁均比湿煤样要大。研究有效指导了大众煤矿的局部突出危险性预测。

Experimental study on sensitive indexes of local outburst prediction in coal mine

In order to study sensitivity indexes and its critical value of local methane outburst，two coal samples were taken in the No.Ⅱ₁ coal seam of Dazhong Coal Mine.Two coal samples were divided into dry coal samples and wet coal samples after treatment.The results showed that under the same pressure conditions，the methane desorption volume of coal samples increased with the increase of equilibrium pressure.The initial desorption volume and limit desorption volume of dry coal samples were larger than that of wet coal samples，and the initial desorption rate was also higher.The drill cuttings desorption indexes Δh₂ and K₁ increase with the increase of the equilibrium pressure，and the drill cuttings desorption indexes Δh₂ and K₁ of the dry coal samples were larger than the wet coal samples.This study can effectively guide the prediction of local outburst risk in Dazhong Coal Mine.