论文部分内容阅读
利用自行设计改装的煤岩体三轴渗流仪以低渗透性松软构造原煤体试件为研究对象进行实验,研究了抽采负压作用下松软构造煤体中瓦斯渗流规律。实验结果表明:静态加载过程中围压、轴压、进口瓦斯压力保持恒定的条件下瓦斯渗透率随着抽采负压的增大而增大,负压较高时,煤体瓦斯渗透率增幅较小,负压为30 kPa时,渗透率的增幅已趋于0;改变加载轴压、围压及瓦斯进气口压力,比较不同组别之间的差异性发现,随着加载轴压和围压的增大,构造煤瓦斯渗透率一直在降低,提高进气口瓦斯压力及出口抽采负压则有利于提高渗透率,但总体增幅较小。
Using the self-designed coal-rock three-axis seepage flowmeter, a low permeability and soft structure coal sample was taken as the research object to study the gas seepage law of loosely-structured coal under the action of negative pressure of pumping. The experimental results show that the permeability of gas under confining pressure, axial pressure and inlet gas pressure is constant with the increase of negative pressure during the static loading process. When the negative pressure is high, the gas permeability of coal increases When the negative pressure is 30 kPa, the increase of permeability has tended to be zero. The change of axial pressure, confining pressure and gas inlet pressure are compared. Comparing the differences between different groups, it is found that with the increase of axial pressure and With the increase of confining pressure, the gas permeability of tectonic coal has been decreasing. Increasing the gas pressure of inlet gas and the negative pressure of outlet gas extraction will help to increase the permeability, but the overall increase is small.