祁南煤矿72^#煤层钻屑瓦斯解吸指标敏感性分析

Analysis of sensitivity of gas desorption index of drill cuttings in No.7_2 coal seam in Qinan Coal Mine

为了确定祁南煤矿72#煤层钻屑瓦斯解吸指标的敏感性,采用实验室实验和现场统计分析相结合的方法进行研究。通过实验室模拟现场测定指标,掌握钻屑瓦斯解吸指标与吸附平衡压力之间的关系,结合煤层区域预测指标(瓦斯压力)得到指标的参考临界值。以714运输巷为考察对象,采用现场实测方法研究指标的分布规律和相关性,并利用临界值迫近度法对敏感性进行定量分析,结果表明:在突出危险性预测和效果检验工作中,祁南煤矿72#煤层钻屑瓦斯解吸指标Δh2相对K1敏感性更高,可作为主要预测指标。

In order to determine the sensitivity of gas desorption index of drill cuttings in No.72 coal seam in Qinan coal mine,the paper adopts the laboratory experiment combining with field statistical analysis method.Through the index obtained from laboratory simulation,the relation between gas desorption index of drill cuttings and adsorption equilibrium pressure is grasped,and combining which with the predicted index（gas pressure） in coal seam area,the critical value of the gas desorption index of drill cuttings is also worked out.Taking the 714 main roadway as the investigating object,the paper adopts the field tests to analyze the distribution law and relevance of the indices,and uses the closeness degree to critical value method to make quantitative analysis.The result indicates that in the work of predicting the danger of gas outburst and testing its effect in No.72 coal seam in Qinan coal mine,the gas desorption index of drill cuttings has higher sensitivity than and it can be used as the main predicting index.