压裂煤体煤与瓦斯突出敏感指标及其临界值的确定

Determine the Sensitive Index and Critical Value of Coal and Gas Outburst of Fracturing Coal Mass

为了确定新景煤矿压裂区域的煤与瓦斯突出预测敏感性指标及其临界值,并确定其适用条件,基于现场突出预测指标跟踪考察数据,采用模糊数学方法,分析确定钻屑瓦斯解吸指标K 1、钻屑量S为敏感指标。在保证突出预测准确率达65%的基础上,运用“三率法”确定突出预测指标临界值:钻屑瓦斯解吸指标K 1临界值为0.4 mL/(g·min 1/2),钻屑量S临界值为6 kg/m;引入含水率作为敏感指标临界值的适用条件,统计分析了考察范围内压裂钻孔径向范围15 m煤体的基础含水率,确定其临界值为7.43%。

In order to determine the sensitivity index and critical value of coal and gas outburst prediction in the fractured area of Xinjing Coal Mine, and determine its applicable conditions, based on the tracking survey data of field outburst prediction index, the paper analyzed and determined the drilling cuttings gas analytic index K 1 and drilling cuttings quantity S as the sensitive indexes by fuzzy mathematics method. On the basis of ensuring the prediction accuracy of outburst up to 65%, the critical value of outburst prediction index was determined by using “three rate method”;the critical value of the drilling cuttings gas analytic index K 1 was 0.4 mL/(g·min 1/2 )and the critical value of drilling cuttings quantity S was 6 kg/m;by introducing water content as the applicable condition of critical value of sensitive index, the basic water content of 15 m coal mass within the radial range of fractured borehole was statistically analyzed, and the critical value was determined to be 7.43%.