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为研究低透气性煤层中瓦斯渗流的各向异性,以同一煤岩平行层理方向和垂直层理方向制取煤样,利用自主研制的试验装置进行含瓦斯煤三轴伺服渗流试验.结果发现平行层理煤样的渗透率远大于垂直层理煤样.在峰值破坏前,平行层理煤样随着轴压增加,渗透率在应力屈服点达到最小值,垂直层理煤样在弹性阶段初始时达到最小值;峰值破坏后,两个方向煤样的渗透率均呈非线性增长.
In order to study the anisotropy of gas seepage in low permeability coal seam, coal samples were prepared by parallel bedding direction and vertical bedding direction in the same coal seam, and the self-developed test device was used to carry out the triaxial servo seepage test with gas coal. The permeability of parallel stratified coal samples is much larger than that of vertical stratified coal samples. Before the peak damage, the permeability of parallel stratified coal samples increases with the increase of axial compressive stress, and reaches the minimum value at the stress yield point. The initial value reached the minimum. After the peak failure, the permeability of coal samples in both directions showed a non-linear increase.