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为了更好地认识和防治煤与瓦斯突出,利用扫描电子显微镜和静态液氮吸附仪研究一种构造软煤的微孔结构特征,同时利用自主搭建的大型石门揭煤相似模拟试验系统,研究石门揭露构造软煤过程中瓦斯压力的变化规律。在试验研究的基础上,分析构造软煤的微孔特性对瓦斯赋存的影响,以及瓦斯在石门揭露构造软煤诱发煤与瓦斯突出中的作用。通过试验得出:构造软煤的结构破坏严重,微孔发育并且为特殊瓶颈的不透气孔,为瓦斯的赋存提供了极为有利的条件;瓦斯在突出的启动和发展过程中起重要作用,即在瓦斯压力突然降低、释放膨胀潜能时,瓦斯压力作为动力来源,加速了煤体向采掘空间抛出的过程。
In order to better understand and prevent the outburst of coal and gas, the microstructure characteristics of soft coal are studied by means of scanning electron microscope and static liquid nitrogen adsorber. Simultaneously, Reveal the variation law of gas pressure during the construction of soft coal. Based on the experimental study, the influence of the micropore characteristics of the constructed soft coal on the occurrence of gas and the role of gas in uncovering soft coal in Shimen to induce coal and gas outburst are analyzed. The results show that the structure of soft coal is damaged seriously, the micropores are developed and impermeable for special bottleneck, which provides extremely favorable conditions for the occurrence of gas. Gas plays an important role in the process of salient start-up and development, That is, when the gas pressure suddenly drops and the expansion potential is released, gas pressure acts as a power source, accelerating the process of coal being thrown into the mining space.