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为了查明受载煤样瓦斯解吸规律,自行设计了受载煤岩恒压瓦斯吸附解吸实验装置,进行了不同轴压和瓦斯压力条件下柱状煤样瓦斯解吸实验,分析了轴压和瓦斯压力对瓦斯解吸的影响,并根据瓦斯解吸经验公式,对实验结果进行了拟合。研究结果表明:在相同轴压条件下,瓦斯压力越高,煤样瓦斯解吸量越大,解吸速率越快;在相同瓦斯压力下,轴压越高,煤样瓦斯解吸量越大,解吸速率越快;轴向受载煤样瓦斯解吸规律符合艾黎公式,式中m值能够表征煤体内部孔裂隙发育程度。随着轴压增加,微裂隙逐渐发育,m值逐渐减小。
In order to ascertain the law of gas desorption of loaded coal, a self-designed experiment device of constant pressure gas adsorption and desorption of loaded coal was designed. Gas desorption experiments of columnar coal under different axial pressures and gas pressures were carried out. Axial pressure and gas Pressure on gas desorption, and according to gas desorption empirical formula, the experimental results were fitted. The results show that under the same axial pressure, the higher the gas pressure is, the higher the desorption rate of coal gas is and the faster the desorption rate is. Under the same gas pressure, the higher the axial pressure is, the larger the gas desorption rate is. The desorption rate The faster the gas desorption law of axially loaded coal samples complies with the formula of Ai Li, where the value of m can characterize the extent of pore fissures in the coal body. As the axial pressure increases, the micro-cracks develop gradually and the m value decreases gradually.