[1]孟然,徐经苍,魏攀,等.顺层瓦斯抽放钻孔渗流场数值模拟及应用[J].西安科技大学学报,2015,(05):561-566.[doi:10.13800/j.cnki.xakjdxxb.2015.0506]
 MENG Ran,XU Jing-cang,WEI Pan,et al.Numerical simulation and application of drilling gas drainage holes along seam in current seam[J].Journal of Xi'an University of Science and Technology,2015,(05):561-566.[doi:10.13800/j.cnki.xakjdxxb.2015.0506]
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顺层瓦斯抽放钻孔渗流场数值模拟及应用(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2015年05期
页码:
561-566
栏目:
出版日期:
2015-10-08

文章信息/Info

Title:
Numerical simulation and application of drilling gas drainage holes along seam in current seam
作者:
孟然1徐经苍2魏攀1许满贵1成宾2
1.西安科技大学 能源学院,陕西 西安 710054; 2.陕西陕煤澄合矿业有限公司,陕西 澄城 715200
Author(s):
MENG Ran1XU Jing-cang2WEI Pan1XU Man-gui1CHENG Bin2
1.College of Energy Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Shaanxi Chenghe Mining Co.,Ltd.,Chenghe 715200,China
关键词:
煤矿 瓦斯 顺层钻孔 数值模拟
Keywords:
coal mine gas drill holes along seam numerical simulation
分类号:
TD 712
DOI:
10.13800/j.cnki.xakjdxxb.2015.0506
文献标志码:
A
摘要:
切实可行的瓦斯抽放方式是预防煤矿瓦斯事故灾害的重要方法之一。为了能准确合理地确定顺层瓦斯抽放钻孔的布置参数,基于煤层瓦斯流动理论,建立钻孔抽放瓦斯渗流场数学模型,运用有限元分析软件COMSOL-Multiphysics,以董家河煤矿22518工作面为例,对工作面顺层钻孔瓦斯抽放过程进行数值模拟,研究抽放钻孔周围瓦斯渗流场分布规律,确定22518工作面顺层瓦斯抽放钻孔的布置方式。结果表明:瓦斯抽放初期,瓦斯抽放量较大,持续时间较长,抽放瓦斯卸压作用使得钻孔周围一定范围内的煤体渗透率显著提高,在钻孔中心位置,瓦斯渗流速度达到最大值,煤体孔隙率随着抽放时间的推移逐渐降低,设计钻孔直径90 mm,抽放负压20 kPa,钻孔有效抽放半径确定为3~4 m时抽放效果较好。该研究结果对提高瓦斯抽放效率,预防瓦斯事故灾害,保障煤矿安全生产具有重要的指导意义。
Abstract:
The feasible gas extraction method is one of the important approaches to prevent the occurrence of the mine gas accident.In order to determine the reasonable parameters of drilling gas drainage holes along seam,based on gas flow theory,seepage field mathematical model of gas suction by drilling is established,by using the finite element analysis method of COMSOL-Multiphysics,the process of gas drainage in drilling hole along seam in current seam is numerically simulated to study the distribution rules of gas permeation field around drainage hole in case of 22518 working face in Dongjiahe coal mine,and determine the arrangement modes of drainage holes of drilling gas along seam in current seam.The study results show that,large amount and long duration of gas extraction content occurred at the beginning of gas drainage period,the coal permeability increases visibly under the action of relief pressure of gas extraction around the drill,seepage velocity reached maximum at the center of drill and the coal porosity decreases gradually with the time.In the conditions of drilling hole diameter of 90 mm and negative suction pressure of 29 kPa,the effective drainage radius is best set to 3~4 m.The results have important guiding significance for increasing the gas drainage efficiency,preventing mine from gas accident and guaranteeing coal mine safety production.

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备注/Memo

备注/Memo:
通讯作者:孟 然(1990-),男,陕西西安人,硕士研究生,E-mail:mcr615@foxmail.com
更新日期/Last Update: 2015-09-15