中文摘要：

为深入探讨煤层注水的防突机理,采用压汞法测试阳泉3号煤干燥煤样和高压注水后煤样的孔隙特性,通过试验发现：注水后煤样孔容、平均孔径、孔隙率及渗透率比注水前分别增加45.17%,48.88%,46.26%和122.95%;而且试验煤样孔隙发育,裂隙和大孔占总孔容的90%以上,过渡孔和微孔占总比表面积的99%以上。试验结果表明,注水前后试验煤样孔隙特性的发生明显变化,说明高压注水对阳泉3号煤的孔隙特性影响显著。通过分析认为,阳泉3号煤具备注水防突的条件,在孔容方面,裂隙和大孔发育,有利于煤层注水水分充分运移;在比表面积方面,以微孔为主,有利于水分在大孔通道中封堵吸附瓦斯,在毛细管力作用下形成抑制解吸效应。

英文摘要：

To further explore the mechanism of preventing gas and coal outburst by infusing water into coal seam, pore characteristics of the drying coal examples and high-pressure water infusion coal examples taken from the 3rd coal seam of Yangquan in Shanxi were studied by using mercury porosimetry method. It was found that water infusion makes pore volume, average pore diameter, porosity and permeability in- crease by 45.17%, 48.88% ,46.26% and 122.95% respectively. And more, it was found that the coal pore of 3rd coal seam of Yangquan was well developed, with fractures and big pore accounting for more than 90% of total pore volume, and intermediate holes and micro-hole accounting for more than 99% of total pore surface area. Through analysis, the authors think that 3rd coal seam of Yangquan is a seam suitable for using water injection to prevent outburst.