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以许疃煤矿古近系巨厚红层沉积层下伏32煤层为研究对象,对32煤层多元物性参数进行分析,对32煤层突出预测指标及其临界值进行研究。结果表明:许疃煤矿32煤层上方有无红层覆盖,对32煤层瓦斯赋存规律存在明显影响。红层覆盖区与非红层覆盖区下的煤样多元物性参数无明显区别。瓦斯压力值作为区域突出预测的判定指标,指标△h2作为局部突出预测的判定指标,并采用“三率”分析法验证指标△h2的准确性。
Based on the 32 coal seams beneath the Jurassic thick sedimentary layer in the Paleogene of Xufan Coal Mine, the multivariate physical parameters of the 32 coal seam are analyzed, and the prominent predictors and critical values of the 32 coal seam are studied. The results show that there is no red layer above the 32 coal seam in Xutiang coal mine, which has obvious influence on the gas occurrence law in coal seam 32. No significant difference was found in the multivariate parameters of coal samples between the red cover and the non-red cover. The gas pressure value is taken as the judgment indicator of regional salient prediction, the indicator △ h2 is used as the judgment indicator of local salient prediction, and the accuracy of indicator △ h2 is verified by the method of “three rates”.