煤炭工程 ›› 2016, Vol. 48 ›› Issue (1): 81-83.doi: 10.11799/ce201601024

• 生产技术 • 上一篇    下一篇

基于抽采评判指标的有效抽采半径确定方法

王闯,陈大力,石永生   

  1. 煤科集团沈阳研究院
  • 收稿日期:2015-04-28 修回日期:2015-06-18 出版日期:2016-01-10 发布日期:2016-02-01
  • 通讯作者: 王闯 E-mail:wangchuang897@163.com

Determination Method of Effective Extraction Radius Based on Evaluation Index

  • Received:2015-04-28 Revised:2015-06-18 Online:2016-01-10 Published:2016-02-01

摘要: 为合理确定顺层瓦斯钻孔有效抽采半径,依据煤层瓦斯流动达西定律、菲克扩散定律和质量守恒定律,建立了钻孔周围煤体瓦斯流动方程,分析了不同评判指标下有效抽采半径确定方法,并基于景福煤矿瓦斯衰减系数测算值采用抽采率指标法进行了有效抽采半径的计算,结果表明:有效抽采半径随时间增加而增大,逐渐趋于极限有效抽采半径1.4m;抽采时间为86d时,有效抽采半径增大速度减缓,抽采半径达1.33m,为极限半径的95%。

关键词: 顺层钻孔, 抽采达标评判指标, 有效抽采半径, 菲克扩用定律, 达西定律

Abstract: To determine the effective gas extraction radius of the dill hole along coal seam reasonably, based on Darcy’s law, Fick’s law of diffusion, as well as gas flow method in the coal, gas flow equation was established, different determination methods were analyzed according to different gas extraction evaluation index, extraction rate was adopted to calculate the effective radius on the basis of Jingfu mine field gas attenuation coefficient, the results show that the effective radius increases to the limit of 1.4m gradually ,and the process slows down with time going on, at the time of 86ds the radius become 1.33m.

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