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以前期获得的实验研究成果为基础,基于力学平衡方程,建立了描述瓦斯气体渗流特征的非线性渗流方程.分析了煤与瓦斯气体分子间的吸附作用对渗流过程的影响.结合自行设计的煤岩渗透特性测试装置,提出了确定非线性渗流关键参数的新方法.结果表明:达西定律需经修正方能描述瓦斯气体在煤体内的流动,煤与瓦斯气体分子间的吸附作用对瓦斯渗流影响显著.含瓦斯煤体内,非线性附加阻力来源于基质膨胀、边界层影响、吸附的动态传质过程.
Based on the experimental results obtained in the previous period, based on the mechanical equilibrium equation, a nonlinear seepage equation describing the gas seepage characteristics was established, and the influence of adsorption between coal and gas molecules on the seepage process was analyzed. Combined with the coal designed by ourselves A new method to determine the key parameters of nonlinear seepage was proposed.The results show that Darcy’s law needs to be modified to describe the flow of gas in coal and the effect of gas adsorption between coal and gas on gas seepage The influence is significant.In the gas containing coal, the nonlinear additional resistance comes from the dynamic mass transfer process of matrix expansion, boundary layer influence and adsorption.