近距离煤层群卸压瓦斯抽采机理分析及工程验证  

Analysis and Project Verification on Pressure Released Gas Drainage Mechanism of Closed Distance Seam Group

作　　者：刘建高 

机构地区：[1]华晋焦煤有限责任公司,山西柳林033315

出　　处：《煤炭工程》2014年第3期61-64,共4页Coal Engineering

基　　金：国家重点基础研究发展计划(973计划)课题(2011CB201206);油气重大专项课题(2011ZX05040-001)

摘　　要：对于岩体而言,孔隙率应该是其固有的物理属性,而作者通过压汞实验发现煤体的孔隙率却可以随着受压和卸载作用有较大的变化,并直接影响煤层瓦斯区域预抽的效果。文章从如何增加预抽瓦斯量的本质出发,通过对孔隙率和游离瓦斯量的计算和分析,实验中利用压汞法测量被保护煤层煤样孔隙率,利用间接和直接方法测定区域瓦斯压力,通过计算分析和现场瓦斯抽采实测数据统计验证,孔隙度的增加对游离瓦斯量的增加和卸压瓦斯抽采效果的提升起到决定性的作用;并在实践中发现保护层工作面后方60m的范围内,其下伏被保护煤层的孔隙率和游离瓦斯量达到最大值,卸压瓦斯抽采效果最好。Porosity is one inherent physical property of rocks, but the result of mercury intrusion porosimetry shows that the porosity of rocks varies greatly under the pressure and relieving, directly influencing the pre - drainage effect of gas area in coal seam. In order to increase the pre - drainage gas quantity, the porosity of coal was measured with mercury intrusion porosimetry and free gas quantity was also calculated and analyzed. The gas pressure was measured applying direct and indirect methods, and the calculation and analysis combining with in - sitn measurement show that, the increase of porosity is critical to the increase of free gas quantity and to the effect enhancement of pressure - relieving gas drainage. The mining practice shows that, the maximum porosity and free gas quantity of lower protecti seam are within 60m behind the protective seam mining face.

关 键 词：近距离煤层群 卸压煤层 孔隙率 游离瓦斯 瓦斯抽采 

分 类 号：TD712.6[矿业工程—矿井通风与安全]