煤层注水抑制瓦斯解吸效应试验研究

发布时间：2018-03-31 17:28

本文选题：安全工程　切入点：煤层注水　出处：《安全与环境学报》2015年02期

【摘要】：煤层注水宏观上具有疏松煤体、卸压排放瓦斯的效应,这是人们对煤层防突机理的初步认识。为进一步认清煤层防突机理,采用实验室试验和现场测试相结合的方法,在实验室中使干燥煤样在煤样罐中预先吸附瓦斯来模拟原始煤层,然后向试验煤样高压注入水分,注水后再测试瓦斯解吸等温特性曲线、瓦斯解吸速度及残存瓦斯含量。测验结果表明,注水后瓦斯解吸等温特性曲线上移,初始瓦斯解吸速度变小且衰减速度变慢,残存瓦斯含量增加,现场测试钻屑瓦斯解吸指标值降低。通过分析测试结果认为,注水后,水分进入并留存在煤体的微孔隙中,对煤层瓦斯具有抑制解吸效应,而抑制解吸效应可以降低瓦斯初始解吸速度,使瓦斯解吸过程变缓,避免瓦斯突然快速解吸。这是煤层注水防治煤与瓦斯突出的一项重要机理。
[Abstract]:Coal seam water injection has the effect of loosening coal body and discharging gas under pressure. This is a preliminary understanding of the mechanism of preventing coal seam outburst. In order to further understand the mechanism of coal seam outburst prevention, the method of combining laboratory test with field test is adopted. In the laboratory, the dry coal sample is preadsorbed gas in the coal sample tank to simulate the original coal seam, then water is injected into the test coal sample under high pressure, and the isothermal characteristic curve of gas desorption is tested after water injection. The test results show that the isothermal characteristic curve of gas desorption moves up after water injection, the initial gas desorption velocity becomes smaller and the decay rate becomes slower, and the residual gas content increases. By analyzing the test results, it is concluded that after water injection, moisture enters and remains in the micro-pores of coal body, which can inhibit the desorption effect of coal seam gas. The inhibition of desorption effect can reduce the initial desorption rate of gas, slow down the process of gas desorption, and avoid the sudden and rapid desorption of gas, which is an important mechanism for preventing coal and gas outburst by water injection in coal seam.
【作者单位】：河南理工大学安全科学与工程学院;河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重实验室培育基地;煤炭安全生产河南省协同创新中心;
【基金】：国家自然科学基金项目(51204066,41372160) 河南理工大学博士基金项目(B2012-082)
【分类号】：TD712

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