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基于孔隙率的定义,建立了考虑孔隙瓦斯压力、瓦斯吸附膨胀和地应力作用的含瓦斯煤渗透率模型,并研究了抽采过程中含瓦斯煤渗透率的动态变化特征。结果表明:含瓦斯煤的渗透率随地应力的增加呈指数形式降低,随瓦斯压力的减少呈现出先减小后增大的变化特征;瓦斯抽采过程中煤体弹性模量越小和吸附常数越大越有利于煤体渗透率的改善,而泊松比的变化对煤体渗透率的影响较小,对于合理地选择瓦斯抽采区域、布置瓦斯抽采工程和采取瓦斯抽采措施具有一定的指导意义。
Based on the definition of porosity, a gas permeability model considering gas pressure, gas adsorption and expansion and in-situ stress was established. The dynamic characteristics of gas permeability during gas drainage were also studied. The results show that the permeability of coal-bearing coal decreases exponentially with the increase of in-situ stress and decreases first and then increases with the decrease of gas pressure. The smaller the elastic modulus of coal and the more the adsorption constant Greater is more conducive to the improvement of coal permeability, and the change of Poisson’s ratio has little effect on the permeability of coal, which has some guidance for choosing gas drainage area rationally, laying gas drainage project and adopting gas drainage measures significance.