煤炭工程 ›› 2014, Vol. 46 ›› Issue (3): 61-64.doi: 10.11799/ce201403020

• 研究探讨 • 上一篇    下一篇

近距离煤层群卸压瓦斯抽采机理分析及工程验证

刘建高   

  1. 煤炭科学研究总院
  • 收稿日期:2014-01-15 修回日期:2013-09-18 出版日期:2014-03-14 发布日期:2014-03-15
  • 通讯作者: 刘建高 E-mail:jiwenbo8403@163.com

Gas extraction mechanism and effect analysis in pressure releasing area of closed distance coal seam group

  • Received:2014-01-15 Revised:2013-09-18 Online:2014-03-14 Published:2014-03-15

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。本文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。

关键词: 近距离煤层群, 卸压煤层, 孔隙率, 游离瓦斯, 瓦斯抽采

Abstract:

In this paper, starting from how to increase the amount of pre-pumping gas essentially, by way of calculation and analysis of porosity and the amount of dissociative gas, we got some basic conclusions of gas extraction in pressure releasing area of closed distance coal seam group, which verified on the basis of the measured field parameters and statistics. Computational analysis and field experiments show that the increased porosity plays a decisive role for increase in the amount of dissociative gas and effect enhancement of gas extraction in pressure releasing area. Maximum of porosity and dissociative gas of pressure releasing coal seam appear in the range of 60 m in the rear of the protective coalface, where pressure relief gas extraction works best.

Key words: closed distance coal seam group, pressure releasing seam, porosity, dissociative gas, gas extraction