Abstract To examine the characteristics of the anisotropic seepage of the coal containing gas, a study of the anisotropic seepage rule of the coal containing gas was carried out based on the tri-axial seepage experimental system with raw coal samples. The calculation method determined the principal value and the azimuth of the anisotropic permeability of the coal containing gas. Also, the permeability anisotropic ratio of the coal containing gas was defined. The permeability anisotropic dynamic variation rule and the phenomenon of the change of the dominant flow direction of the coal containing gas were thoroughly analyzed. The results showed that the flow of the methane in the coal had very obvious characteristics of anisotropy. The calculation method of anisotropy permeability of the coal containing gas proposed in this study was found to be simple and effective. The coal containing gas displayed strong stress-sensitivity. The variation rule between the permeability of the methane in the coal and the effective stress was determined to be in accordance with the negative exponential function. The change of the permeability anisotropy of the gases in the coal with effective stress showed an obvious dynamic change law of development, and changes were observed in the dominant flow direction of the gas in the coal.

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含瓦斯煤各向异性渗透规律的试验研究

摘要 为研究含煤瓦斯各向异性渗流特征，基于原煤样三轴渗流实验系统，研究了含煤瓦斯各向异性渗流规律。计算方法确定了含气煤各向异性渗透率的主值和方位角。此外，还定义了含气煤的渗透率各向异性比。深入分析了渗透率各向异性动态变化规律和含煤瓦斯主导流向变化现象。结果表明，煤中甲烷的流动具有非常明显的各向异性特征。本研究提出的含煤瓦斯各向异性渗透率计算方法简单有效。含气煤表现出较强的应力敏感性。确定煤中甲烷渗透率与有效应力的变化规律符合负指数函数。煤中气体渗透率各向异性随有效应力的变化表现出明显的动态变化规律，煤中气体的主导流动方向发生变化。