论文部分内容阅读
为了解低渗透煤体的瓦斯渗流机理,开展了低渗透煤体的变形与瓦斯渗流的相互作用规律研究.根据低渗透煤体的瓦斯渗流特性,确定了煤体渗透率的动态变化模型;通过建立煤层瓦斯渗流方程与煤体的变形场方程,引入煤体孔隙率的动态变化模型,定义了研究问题的初始及边界条件,推导得到了低渗透煤与瓦斯的固-气动态耦合模型.针对含瓦斯煤体试件的定解条件和模型参数,进行了耦合模型的数值模拟研究.结果表明:数值模拟预测的瓦斯渗透速度,与试验的实测结果吻合较好,且随着煤体渗透率减小,模拟结果更逼近实测结果,其最小误差为0.9%.
In order to understand the mechanism of gas seepage in low-permeability coal, the law of interaction between low-permeability coal and gas seepage is studied.Based on the gas seepage characteristics of low-permeability coal, a dynamic model of permeability of coal is established. The gas field seepage equation of coal seam and the deformation field equation of coal body are established, the dynamic change model of the porosity of coal body is introduced, the initial and boundary conditions of the research problem are defined, and the solid-gas dynamic coupling model of low permeability coal and gas is deduced. The results of numerical simulation of the coupled model show that the gas permeation velocity predicted by numerical simulation is in good agreement with the measured results of the test, and with the permeability of coal Decrease, the simulation result is closer to the measured result, the minimum error is 0.9%.