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以贵州玉舍煤矿3号煤层煤样为实验对象,利用自行研发的三轴渗透仪,进行了不同含水率条件下恒平均有效应力—变温度的三轴渗流实验。研究结果表明:型煤渗透率受水分的影响较敏感,渗透率与水分成反相关关系,并服从指数分布,且含水率越高,型煤的渗透率降低幅度越大;各种实验条件下,含瓦斯煤烘干煤样的渗透率均大于含水煤样的渗透率,且烘干煤样与含水煤样渗透率之间的减小幅度与含瓦斯煤样所受的平均有效应力大小有关;随着温度的增加,干燥煤样和含水煤样渗透率均呈减小趋势,但在55℃后,含水煤样渗透率略有增大。实验结论为贵州瓦斯灾害防治和煤层气的开发利用提供了理论依据。
Taking coal sample No.3 of Guizhou Yushe Coal Mine as an example, a three-axis seepage experiment with constant average effective stress-temperature under different water cut rates was carried out by using self-developed three-axis infiltrometer. The results show that the permeability of briquette is sensitive to the influence of moisture, the permeability is inversely related to the water content and obeys the exponential distribution, and the higher the moisture content, the greater the decrease of permeability of briquette. Under various experimental conditions , The permeability of coal samples containing gas coal is higher than the permeability of water-containing coal samples, and the decrease of the permeability between dry coal samples and water-containing coal samples is related to the average effective stress . With the increase of temperature, the permeability of dry coal samples and aqueous coal samples showed a decreasing trend, but after 55 ℃, the permeability of aqueous coal samples slightly increased. The experimental results provide a theoretical basis for the prevention and control of gas disasters in Guizhou and the development and utilization of coalbed methane.