水分对不同煤阶煤瓦斯放散初速度的影响

Moisture Content Affected to Initial Gas Emission Velocity of Different Ranking Coal

为提高矿井煤与瓦斯突出预测的准确性,对经过干燥处理的不同含水量的无烟煤、焦煤和长焰煤的瓦斯放散初速度进行了测定。结果表明:水分对无烟煤、焦煤和长焰煤的瓦斯放散初速度均有影响,同一煤阶煤样的水分越大,瓦斯放散初速度越小;且瓦斯放散初速度随水分增加呈指数式减小,水分减小了煤样的瓦斯吸附量是造成瓦斯放散初速度减小的根本原因;水分对无烟煤瓦斯放散初速度影响最大,长焰煤居中,焦煤最小,其原因为不同煤阶煤的孔隙特性不同。

In order to improve the prediction accuracy of the coal and gas outburst in mine, measurements were conducted on the initial gas emission velocity of the anthracite coal, coking coal and long flame coal with different moisture contents after dry treatments. The resuits showed that the moisture would all have the influences to the gas initial emission velocity of the anthracite coal, eoking coal and long flame coal. The higher moisture content of the coal samples in different ranking coal, the lower initial gas emission velocity would be. The gas initial emission velocity would be decreased with the moisture content increased in index. The gas adsorption value of the coal sample with the moisture reduced was the fundamental causes to reduce the gas initial emission velocity. The moisture content would have highest influences to the gas initial emission velocity of the anthracite coal, the medium influences to the long flame coal and the lowest influences to the coking coal. The reason was the different pore features of different ranking coal.