构造煤的瓦斯放散特征

Gas irradiation feature of tectonic coal

通过对构造煤与非构造煤在微观结构上差异的分析,进行了构造煤瓦斯放散的微观与宏观数学模型理论研究.通过研制的自动化瓦斯放散速度测试仪器,在实验室测定了最小突出压力吸附下煤的瓦斯放散速度,并结合构造煤瓦斯放散的数学模型,得出构造煤的瓦斯放散特征.认为构造煤在应力降低或解除时,瓦斯运移规律用菲克定律描述比达西定律更合理;构造煤前60 s的瓦斯放散速度规律更符合文特式V=V1t-a,且第1秒时的瓦斯放散速度V1、衰减系数、Q0-60、Δp值均与非构造煤有很大的差异.

Analyzed the difference of tectonic coal and none tectonic coal in micro structure, discussed tectonic coal irradiation micro and macro mathematic model theory. By using automatic gas release velocity test equipment, determinating coal gas irradiation velocity in the least burst pressure adsorption condition in the lab, and combining tectonic coal gas irradiation mathematic model, gas irradiation feature of tectonic conclusion was drawn. When tectonic coal gas stress is decreased or stress relieved, gas migration law described by Fick law is more reasonable than Darcy law ; the gas irradiation velocity rule of tectonic coal in 60 seconds accords with Winter V = V1t^-a, and the first second gas irradiation velocity V1, attenuation coefficient a, irradiation total amount Q0-60 in 60 seconds, △p index have the significant difference with none tectonic coal.