Experimental Study on Influence of Coal Structural Anisotropy to Gas Permeation
In underground gas extraction process, under drilling negative pressure and differential coal gas pressure, gas through a crack of coal seam flows to drill hole. The structural anisotropy of coal fracture itself makes the flow characteristics of gas in coal body quite different, especially on the bedding plane and vertical bedding conditions. The study on the effect of the structural anisotropy of coal fracture to permeability has important actual significance on choosing design parameters of drill in gas extraction design. Based on true triaxial coal rock permeability of coal sample test system , the permeability under different gas pressure to coal specimen in bedding plane and the vertical bedding directions are tested. The results showed that: coal structural anisotropy has a greater impact to gas permeability properties; differences in experimental coal permeability are roughly one order of magnitude. In view of the differences of the gas flow characteristics in the coal bedding plane and vertical bedding, established series and parallel choked flow model of coal sample gas seepage, and made a theoretical analysis to the influences of the bedding structure to gas permeability properties.
coal structure gas pressure permeability properties experimental study
QIAO Yan-zhen
Safety Science and Engineering College, Liaoning Technical University, Fuxin 123000, China Engineering and Technology, Hulunbeier College, Hulunbeier 021008, China
国际会议
The 2nd International Conference on Mine Safety and Environment Protection(第二届采矿、安全与环境保护国际会议)
西安
英文
168-171
2011-10-10（万方平台首次上网日期，不代表论文的发表时间）