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以Biot的饱和流体多孔隙介质弹性波传播理论为基础,考虑到游离态瓦斯和吸附态瓦斯对煤体的力学变形特性存在较大差异,将含瓦斯煤体分为无吸附相模型和吸附相模型,并对含瓦斯煤体的弹性波传播规律进行了研究。研究结果表明:无吸附相模型的弹性波速度随着瓦斯压力的增加略有下降,与单相介质煤相比相差不大;吸附相模型的弹性波速度随着瓦斯压力的增加下降趋势明显,表现出明显的双相介质特征。
Based on Biot’s elastic wave propagation theory of saturated porous media, considering that there is a great difference between the mechanical properties of free-flowing gas and adsorbed gas on the mechanical deformation characteristics of coal, the gas-bearing coal body is divided into non-adsorbed phase model and adsorbed phase model , And studied the law of elastic wave propagation of gas containing coal. The results show that the elastic wave velocity of non-adsorbed phase model decreases slightly with the increase of gas pressure, which is not different from that of single-phase medium coal. The elastic wave velocity of adsorptive phase model decreases obviously with the increase of gas pressure, Showing obvious biphasic media characteristics.