瓦斯压力对煤岩材料全应力-应变过程瓦斯渗透特性的影响

Effect of Gas Pressure on Gas Seepage in Complete Stress-strain Process of Coal Material

煤岩材料是典型的多孔介质材料,瓦斯压力是煤岩材料受到的内部孔隙压力。应用自行研制的煤岩材料三轴瓦斯渗流试验装置研究了不同瓦斯压力作用下煤岩材料全应力-应变过程瓦斯渗透特性的变化规律,结果表明,围压恒定时,在某一瓦斯压力下,煤岩材料全应力-应变过程曲线与渗流速度-轴向应变曲线具有较好的对应关系。理论研究表明,瓦斯气体对煤岩材料具有力学和吸附作用。围压恒定时,在一定的瓦斯压力范围内,增加瓦斯压力可增大煤样的渗透率。研究结果对预测煤岩瓦斯涌出和预防煤与瓦斯突出具有现实指导意义。

Coal material is typical porous media material. Gas pressure is internal pore pressure of coal material. By means of self-developed triaxial gas-seepage experimental device of coal material, the experiment of permeability of coal material in the complete stress-strain process under different gas pressure are performed. The results of test show that when the confining pressure are fixed, there are significant corresponding relationship between the complete stress-strain process curve and the seepage velocity-strain curve of coal material. The results of theory research show that when the confining pressure are fixed, with the gas pressure increasing permeability of coal material increases in certain gas pressure. The results is a practical guide for prediction and prevention of coal gas emission.