孔隙压力梯度对煤的渗透性影响实验

为了研究煤体渗透率与压力梯度之间的关系，在考虑煤体吸附变形的基础上建立了煤体渗透率与瓦斯压力梯度的数学模型，并在恒温条件下进行同一压力梯度不同吸附平衡压力的条件下和同一吸附平衡压力不同压力梯度条件下的渗流实验。研究结果表明:在较低的孔隙压力条件下，煤体渗透率随着吸附平衡压力和压力梯度的增加而减小；建立的渗透率动态演化模型能够较好地描述煤层瓦斯抽采过程中瓦斯的流动规律。研究结果可以为我国煤矿瓦斯治理和抽采工作提供一定的理论支撑，具有一定的指导和实践意义。 

Experimental study on the effect of gas pressure gradient on coal permeability

In order to study the relationship between coal permeability and gas pressure gradient, a mathematical model of coal permeability and gas pressure gradient is established in consideration of the coal body adsorption deformation, and the seepage experiment was carried out under the condition of constant temperature. The seepage experiment of coal samples were carried out under condition of different adsorption equilibrium pressures with the same pressure gradient and the same adsorption equilibrium pressure with different pressure gradients. Research results show that:Under the condition of lower pore pressure, the permeability of coal decreases with the increase of adsorption equilibrium pressure; the dynamic evolution model of permeability well describes the gas flow pattern in the coal seam gas drainage process. The research results can provide some theoretical support for the coal mine gas control and drainage work, which has certain guiding and practical significance.