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首页> 外文期刊>ACS Omega >Experiment and Modeling of Permeability under Different Impact Loads in a Structural Anisotropic Coal Body
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Experiment and Modeling of Permeability under Different Impact Loads in a Structural Anisotropic Coal Body

机译：结构各向异性煤体不同冲击载荷下渗透性的实验与建模

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A mount of bedding and cleat in a coal body causes that the mechanical property and gas permeability are anisotropic in a coal seam, partly. To reveal the permeability change law of the impacted coal, a self-developed vertical split Hopkinson pressure bar (SHPB) device is used to carry out the dynamic impact mechanical property tests of coal samples in three different coring directions under five impact loads and then the permeability of the impacted coal samples is measured by a permeability measuring instrument under different gas pressures. Finally, a calculation model for the anisotropic coal permeability is established to analyze the permeability distribution law in any direction with different angles to the bedding plane. The results show that with an increase in impact height the dynamic peak stress of coal samples increases gradually, which shows a linear growth relationship. The permeability of the impacted coal samples is much larger than that of raw coal samples, and the bigger the impact load, the larger the permeability. Moreover, under the same impact load and gas pressure, the permeability is the largest in parallel to the bedding direction, followed by that in oblique 45° to the bedding direction, and the smallest in perpendicular to the bedding direction. The permeability calculated by the anisotropic model in oblique 45° to the bedding direction is in good agreement with the measured results, and the errors are no more than 10%, which will provide a theoretical basis for the permeability distribution law of the coal seam after deep-hole blasting.
机译：在煤体中的床上用品和防滑型导致机械性能和透气性在煤层中是各向异性的。为了揭示受冲击煤的渗透性变化规律，采用自动开发的垂直分裂霍普金森压力棒（SHPB）装置在五个撞击载荷下进行三种不同铰接方向的煤样的动态冲击力学性能试验，然后通过不同的气体压力下渗透测量仪测量撞击煤样品的渗透率。最后，建立了各向异性煤渗透性的计算模型，以分析渗透性分布法在与床上用方向不同的方向。结果表明，随着冲击高度的增加，煤样的动态峰值应力逐渐增加，显示出线性生长关系。受冲击的煤样的渗透性远大于原煤样品，较大的冲击载荷越大，渗透性越大。此外，在相同的冲击载荷和气体压力下，渗透率是平行于床上用品方向的最大的，然后在倾斜45°到床上用品方向上，并且垂直于床上用品方向上最小。通过倾斜四分之体模型计算的渗透率45°至床上用品方向与测量结果吻合良好，并且误差不超过10％，这将为煤层的渗透性分配定律提供理论依据深孔爆破。

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