论文部分内容阅读
为研究复杂条件下煤层煤与瓦斯突出危险性的预测方法,以通顺煤矿2~#煤层为例,对其区域性突出危险性预测敏感指标进行筛选,通过井下直接测定法和实验室对比分析得出瓦斯含量值作为主要判定指标(敏感指标),临界值为8 m~3/t,瓦斯压力作为辅助判定指标,参考临界值定为0.60 MPa。并通过模糊聚类方法分析得出通顺煤矿2~#煤层同一工作面△h_2的相对敏感度最大,K_1次之,S最小,所以选取△h_2作为通顺2~#煤层煤与瓦斯突出危险性预测的敏感指标,K_1和S作为辅助性的参考指标。运用统计学理论和概率分布确定出通顺2~#煤层煤与瓦斯突出危险性预测敏感指标为△h_2,临界值定为180 Pa(湿煤临界值为160 Pa);K_1值作为局部预测的辅助指标,参考临界值为0.41 m L/(g·min~(1/2))(干煤);S反映煤层应力大小,亦作为辅助指标,参考临界值为5.10 kg/m(干煤)。
In order to study the prediction method of coal and gas outburst danger in coal seam with complex conditions, take the No. 2 coal seam of Tongshun Coal Mine as an example, the sensitivity index of regional outburst danger prediction was screened. Through the downhole direct determination method and laboratory comparative analysis, The gas content is taken as the main criterion (sensitive index), the critical value is 8 m ~ 3 / t, and the gas pressure is used as the auxiliary judgment index. The reference critical value is 0.60 MPa. Through the fuzzy cluster analysis, it is concluded that the relative sensitivity of △ h_2 to the same working face of coal seam # 2 to # 2 in Tongshun Mine is the largest, followed by K_1 and S is the smallest, so △ h_2 is selected as the prediction of coal and gas outburst risk Of the sensitive indicators, K_1 and S as a supplementary reference. Using the statistical theory and probability distribution, the sensitivity index of coal and gas outburst hazard prediction in No.2 coal seam is △ h_2, the critical value is 180 Pa (the critical value of wet coal is 160 Pa), K_1 is used as the assistant of local prediction Indicators, the reference threshold is 0.41 m L / (g · min ~ (1/2)) (dry coal); S reflects the magnitude of the stress in the coal seam, which is also used as an auxiliary index. The reference threshold is 5.10 kg / m (dry coal).