Coalbed methane is a lucrative energy source, but its development relies heavily on the fracturing of coal seam and underground extraction during mining. This study of mining stress paths, pore pressure, and permeability of a coal body was aimed to overcome the constraints of low coal permeability under the stress applied to a coal seam group. Variation in the applied stress changes the effective stress in coal and its permeability (which also depends on pore pressure). The effects of different mining intensities, repetitive cyclic loading and unloading, and pore pressure on gas permeability in a coal mine are revealed and discussed. The permeability evolution curve can be described by quadratic polynomial equations and split into three (decreasing, stable, and increasing) stages. When the stress environment with low axial deviatoric stress changes to that with high axial deviatoric stress and when the stability stage becomes longer, the goodness of quadratic polynomial data fitting is reduced. Cyclic loading and unloading with different axial stress paths have different effects on coal permeability. Increased axial and confining pressures decrease the permeability and pore pressure sensitivity of permeability. Because the obtained permeability-pore pressure curves contain a stable stage, this sensitivity is more pronounce in the low and high pore pressure stages.

煤层气是一种有利可图的能源，但其开发在很大程度上依赖于煤层的压裂和开采过程中的地下开采。这项对煤体开采应力路径、孔隙压力和渗透率的研究旨在克服在施加到煤层组的应力下煤渗透率低的限制。施加应力的变化会改变煤中的有效应力及其渗透率（这也取决于孔隙压力）。揭示并讨论了不同开采强度、重复循环装卸和孔隙压力对煤矿瓦斯渗透率的影响。渗透率演化曲线可以用二次多项式方程描述，并分为三个（减少、稳定和增加）阶段。当低轴向偏应力的应力环境转变为高轴向偏应力的应力环境时，当稳定阶段变长时，二次多项式数据拟合的优良度降低。不同轴向应力路径的循环加载和卸载对煤的渗透率有不同的影响。增加的轴向压力和围压降低了渗透率和渗透率的孔隙压力敏感性。由于得到的渗透率-孔隙压力曲线包含一个稳定阶段，这种敏感性在低、高孔隙压力阶段更为明显。增加的轴向压力和围压降低了渗透率和渗透率的孔隙压力敏感性。由于得到的渗透率-孔隙压力曲线包含一个稳定阶段，这种敏感性在低、高孔隙压力阶段更为明显。增加的轴向压力和围压降低了渗透率和渗透率的孔隙压力敏感性。由于得到的渗透率-孔隙压力曲线包含一个稳定阶段，这种敏感性在低、高孔隙压力阶段更为明显。