煤层软硬分层吸附瓦斯性能差异性及其对瓦斯赋存的影响

为研究煤层软、硬分层吸附瓦斯性能差异性及其对瓦斯赋存的影响，分析了煤层内软分层的形成机理及结构特征，采集了我国多个煤与瓦斯突出矿井的煤样作为试验对象，应用高压容量法开展了软、硬分层煤样吸附瓦斯性能参数的对比试验，探讨了软煤、硬煤吸附性能的差异性。在此基础上，对煤层软、硬分层吸附瓦斯性能差异性与瓦斯赋存特征之间的关联进行了研究，结果表明：试验煤样软分层的极限吸附量均大于硬分层；随着瓦斯压力的增加，试验煤样软、硬分层瓦斯含量的差值逐渐增大，其曲线的变化特征与Langmuir方程类似，并且软、硬分层瓦斯含量数值的差异主要由吸附量差值构成；煤层软、硬分层吸附瓦斯性能的差异不仅对煤层原始瓦斯赋存特征有着显著的影响，同时还将影响煤巷掘进、瓦斯抽采过程中煤体内瓦斯流场的分布规律，需要根据煤层软、硬分层的组合特点，制订切实有效的瓦斯抽采技术方案。

Difference of gas adsorption performance between soft and hard layers of coal seam and its influence on gas occurrence

In order to study the difference of gas adsorption performance between soft and hard coal seams and its influence on gas occurrence,the formation mechanism and structural characteristics of soft coal seam were analyzed.Coal samples from several coal and gas outburst mines in China were collected as test objects,the comparative test of gas adsorption performance parameters of soft and hard coal seams was carried out by using high pressure capacity method,and the difference of gas adsorption performance of soft coal and hard coal were analyzed.On this basis,the relationship between the difference of gas adsorption performance between soft and hard coal seams and the gas occurrence characteristics was studied.The results show that the limit adsorption capacity of soft coal seam is greater than that of hard coal seam;with the increase of gas pressure,the difference of gas content of soft and hard coal seam samples increase gradually,and the change characteristics of the curve are similar to the Langmuir equation,the difference of gas content between soft and hard coal seams is mainly composed of adsorption difference;the difference of gas adsorption performance of soft and hard coal seams not only has a significant impact on the original gas occurrence characteristics of coal seam,but also affects the distribution law of the gas flow field in coal in the process of roadway driving and gas drainage,it is necessary to work out effective gas extraction technical scheme according to the combination characteristics of soft and hard coal seams.