湿煤样钻屑瓦斯解吸指标临界值研究及应用

Study and application of critical value of drilling cuttings gas desorption index of wet coal sample

为了提高湿煤样钻屑瓦斯解吸指标预测工作面突出危险性的可靠性,以铁法矿区大隆煤矿13#煤层为研究对象,实验室测定了该煤层不同瓦斯压力和含水率条件下钻屑瓦斯解吸指标Δh2;通过对同一瓦斯压力,不同含水率条件下Δh2指标变化规律及数据拟合分析,得出瓦斯压力相同条件下,Δh2与含水率呈现对数拟合关系;基于该相关关系对湿煤样含水率以及瓦斯压力临界值分析,确定大隆煤矿13#煤层湿煤样钻屑瓦斯解吸指标Δh2的临界值,对提高工作面预测的准确性和保障安全生产具有重要意义。

In order to improve the prediction reliability of working face outburst risk by drilling cuttings gas desorption index of wet coal sample, taking No. 13 coal seam of a coal mine in Tiefa mining area as study object, the drill cuttings gas desorption index Δh 2 under different gas pressure and different coal seam moisture content condition was measured in the laboratory. Through fitting analysis of change rule and data of Δh 2 under same gas pressure and different moisture content, it showed logarithm fitting relationship between Δh 2 and moisture content under same gas pressure; based on the relationship, the wet coal sample moisture content and gas pressure critical value were analyzed and the critical value of Δh 2 of No. 13 coal seam of Tiefa mining area was determined, which had important significance in improving the outburst prediction reliability and insuring production safety.