瓦斯在煤层中流动的机理

MECHANISM OF GAS FLOW IN COAL SEAMS

煤层是孔隙、裂隙结构组成的物质，瓦斯在孔隙结构中的流动主要是扩散，符合菲克定律。在煤层裂隙系统的流动属于渗透，符合达西定律，根据这一规律可用代数方法建立数学模型用电子计算机求解，用相似理论从计算结果中导邮购的单向和径向瓦斯流动曲线与单纯使用达西定律计算的结果相近，煤层瓦斯的流动决定于裂隙系统的特性，鸸 不决定于孔隙结构，用达西定律作为基本规律研究煤层瓦斯流动的机理是完全可行的。

Coal seam is a material which is composed of structures of pores and fissures. Gas flows in pore structures mainly in the form of diffussion,which follows Fick's Law. Gas flowing in the fissures system is in the form of permeation,which follows Darcy's Law.A mathematic model can be established by using algebraic method based on these laws and the solution can be obtained by using computer. The unidirectional and radial gas flow curves derived from the calculated results based on similarity theory are close to the results purely calculated by.Darcy's Law. Flow of gas in a coal seam is determined by characteristics of fissure system,and not by pore structures. It is feasible to study the mechanism of gas flow in coal seams by using the basic rules of Darcy's Law.