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为了研究煤的坚固性系数与含瓦斯煤渗透率之间的关系,以贵州五轮山、玉舍及响水煤矿3层坚固性系数符合梯形分布煤层的煤样为研究对象,利用自主研发的三轴渗透仪,进行了不同坚固性系数条件下,恒温-变平均有效应力和恒平均有效应力-变温的三轴渗流实验,结果表明:(1)含瓦斯煤的渗透率随平均有效应力的增大而减小,并服从形如K(σ)=ke-λσ的负指数分布,且含瓦斯煤渗透率的减小趋势与煤体所受平均有效应力的大小有关;(2)同一坚固性系数煤样的渗透率随温度的增加而降低;(3)相同实验条件下,含瓦斯煤的渗透率随煤样坚固性系数的增加而增加;(4)相同的平均有效应力条件下,煤的坚固性系数对含瓦斯煤渗透率的影响程度大于温度对渗透率的影响。研究结果对贵州瓦斯灾害的防治提供了一定的理论依据。
In order to study the relationship between the solidity coefficient of coal and the permeability of gas-bearing coal, taking coal samples with three-storied solidity coefficient conforming to the trapezoidal coal seam of Wulunshan, Yushe and Xiangshui coal mines in Guizhou as research objects, Three-axis permeameter was used to carry out triaxial seepage experiments with constant temperature-average effective stress and constant average effective stress-temperature under different solidity coefficients. The results show that: (1) the permeability of coal-bearing coal varies with the average effective stress Increases and decreases, and obeys the negative exponential distribution in the form of K (σ) = ke-λσ, and the decreasing trend of the permeability of gas-bearing coal is related to the average effective stress of coal; (2) The permeability of coal samples with sex coefficient decreases with the increase of temperature; (3) Under the same experimental conditions, the permeability of gas containing coal increases with the increase of coal sample’s solidity coefficient; (4) Under the same average effective stress, The influence of the coal solidity coefficient on the permeability of gas containing coal is greater than the influence of temperature on the permeability. The results provide a theoretical basis for the prevention and control of gas disasters in Guizhou.