The Constitute Law of Gas Seepage in Rock Fractures Undergoing Three-dimensional Stress
The Constitute Law of Gas Seepage in Rock Fractures Undergoing Three-dimensional Stress
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DOI：
10.1007/s11242-005-5881-1
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发表时间：
2006-06
影响因子：
2.7
通讯作者：
Dong Yang;Yangsheng Zhao;Yaoqing Hu
中科院分区：
文献类型：
--
作者：
Dong Yang;Yangsheng Zhao;Yaoqing Hu
本文是在近年来对岩石裂隙中气体渗流本构规律研究的基础上提出的。实验和理论推导将被讨论。在我们的实验中使用的气体包括甲烷和CO2，这两种气体都是高吸附性的。实验主要是在煤的裂隙中进行的。结果表明，气体在岩石裂隙中的渗透系数随裂隙孔隙压力呈抛物线变化。当孔隙压力低于一定值时，渗透系数减小，而孔隙压力增大。这与裂隙水渗流规律不同。分析表明，这种异常是由吸附引起的。切向变形对瓦斯渗流规律的影响与法向变形相同。裂缝中气体的渗透率与法向变形和切向变形均呈负指数关系。
This paper is based on the research we have done in recent years of the constitute law of gas seepage in rock fractures. Both experiments and theoretical derivations will be discussed. The gases used in our experiments include methane and CO2, both of which are highly adsorptive. The experiments were conducted mainly in coal fractures. The results reveal that the permeability coefficient of gas in rock fractures varies parabolically with respect to fracture pore pressure. When the pore pressure is below a certain value, the permeability coefficient decreases while the pore pressure increases. It is different from the water seepage law in fractures. Analysis shows that this abnormality is caused by adsorption. It is also concluded that the tangent deformation has the same effects as normal deformation on gas seepage law. The permeability of gas in fractures has a negative exponent relationship with both normal deformation and tangent deformation.