瓦斯隧道中煤的渗透性研究

On Coal Permeability in Gas Tunnel

煤的渗透率是反应煤体中气、水等流体的渗透性的重要参数,决定着煤体中瓦斯等气体产出量大小及产出的速度。煤的渗透率除受自身裂隙程度影响外,还受外部因素(如有效应力、Klinkenberg效应、基质收缩效应等)的影响,其中煤体自身裂隙系统起着关键作用。本文以山西省临吉高速松卜岭隧道穿过的煤层为试验煤样,分析研究了煤的渗透率与体积应力和渗透压力的变化规律,为隧道的开挖、瓦斯监控、通风量大小等现场施工工作提供指导,并为以后注入二氧化碳气体驱替煤层甲烷的研究工作提供理论参考。

Permeability rate of coal is an important parameter reflecting the permeability of gas and water in coal and it determines yield volume and velocity of gases.Besides the influence from self-fissure degree,the coal permeability is also affected by other exterior facts including effective stress,Klingenberg Effect,and matrix shrinking effect.Self-fissure system plays a key role.Taking as a sample the seam through which Songbuling Express Tunnel passes,Linji Shanxi,the article studies the changing regularity of permeability,volume stress and osmotic pressure in order to provide field guidance for tunnel digging as well as gas and ventilation monitoring.The study can offer theoretic reference for methane release by carbon dioxide injection.