State Key Laboratory Cultivation Base for Gas Geology and Gas Control School of Safety Science and
Engineering, Henan Polytechnic University

根据采掘工作面前方煤体的复杂受载状态,利用自主研发的受载煤岩瓦斯渗流试验系统,研究了不同含水率煤样在2次加、卸载围压过程中的渗透率变化特性。研究结果表明:随着围压的增加,煤样的无因次渗透率及渗透率损害系数减小,且减小幅度逐渐趋于平缓;第1次加载过程的应力敏感性要大于第2次加载过程,应力敏感系数随着煤样含水率的增加而增加;围压升降过程中煤样渗透率的变化是不完全可逆过程;第1次围压加、卸载过程中,渗透率损害很大,且随着含水率的增加而增大,第2次加、卸载过程中渗透率损害率较小。研究结果可为深入认识煤层瓦斯运移规律提供试验基础,也可为煤层瓦斯抽采和煤矿瓦斯灾害防治提供理论支撑。

According to the complex loaded status of the coal in front of working face and heading face, the paper used a self-developed loaded coal or rock gas se epage experimental system, studyed the variation characteristics of permeability of coal with different moisture contents in the processes of repeated loading-unloading confining pressure. The results showed that both dimensionless permeability and damage coefficient of permeability decreased with the increase of confining pressure, and the decreasing amplitude tending to be gentle gradually. Stress sensitivity in the first process of loading was more obvious than the second process. As moisture Co ntent increased, stress sensitive coefficient increased. The variation of permeability was incomplete reversible in the process of loading-unloading confining pressure. T he damage of permeability was very big in the first process of loading-unloading. It also increased with the increase of moisture content the damage of permeability was small in the second process of loading-unloading. The research results could not only provide experimental basis for further understanding coal seam gas migration la W, but also provide theoretical support for gas drainage and prevention and control of gas disasters in coal mines.

国家自然科学基金资助项目(51104059)；国家重点基础研究发展计划(973计划)资助项目(2012CB723103)；教育部“创新团队发展计划”资助项目(IRT1235)；教育部科学技术研究资助项目(213022A)；中国博士后科学基金资助项目(2013M531674)；河南省基础与前沿技术研究计划资助项目(132300413203)；