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为了进一步揭示深部煤岩渗透率的变化规律,进行了高有效应力和高温条件下煤体渗透规律测定试验。结果表明:随着有效应力的增大,煤层渗透率呈现递减趋势;温度升高,煤体出现膨胀现象,渗透率减小。初步提出了热力耦合作用下含瓦斯煤渗透率影响机理,即温度升高,煤固体骨架膨胀,试件内部孔隙裂隙体积减小,瓦斯渗流通道减小,渗透率减小;有效应力增大,煤体孔隙裂隙被压缩,导致渗透率逐渐减小。
In order to further reveal the variation law of permeability of deep coal and rock, the experiment of coal penetration law under high effective stress and high temperature was carried out. The results show that with the increase of effective stress, the permeability of coal seams shows a decreasing trend. With the increase of temperature, the expansions of coal appear and the permeability decreases. The influence mechanism of coal gas permeability under thermal coupling is preliminarily put forward. That is, the temperature increases, the solid skeleton of coal expands, the volume of pore fissures decreases, the gas seepage channel decreases and the permeability decreases. The effective stress increases, Coal pore fissures are compressed, resulting in a gradual decrease in permeability.