摘要
为研究合理的瓦斯抽采钻孔布孔参数,采用FLAC3D数值模拟的方法,分析了在巷道影响下钻孔破坏的过程。研究结果表明,平行布孔的钻孔孔壁应力集中程度一致,各个钻孔内部的应力分布相似。钻孔间距小于5倍开孔半径时,孔周煤体产生大范围塑性变形,导致孔壁稳定性差。布孔方式以及布孔间距对孔壁应力集中有较大的影响,采用平行布置方式比倾斜布孔方式的钻孔更为稳定,能够更为有效地保障瓦斯抽采。
In order to study the reasonable parameters of gas drainage borehole, the failure process of the borehole was simulated with the FLAC^3D. The results show that the stress concentration of the hole placed in the parallel is same, and the stress distribution of each borehole is similar. When the spacing is less than 5 times of the radius, it is the surrounding coal having a large range of plastic deformation that results in low stability of borehole wall. The arrangement and spacing of the borehole have great influence on the stress. The borehole placed parallel is more stable than placed in inclined, and it can effectively guarantee the gas drainage.
出处
《煤炭技术》
北大核心
2017年第11期129-131,共3页
Coal Technology
基金
国家自然科学基金资助项目(51374168
51327007
51474172)
关键词
瓦斯抽采
钻孔
数值模拟
gas drainage
borehole
FLAC^3D
numerical simulation
作者简介
张天军（1971-），陕西临潼人，教搅，主要从事力掌与安全交叉学科的研究，电子信箱：tianjun_zhang@126．com；;通信作者：张磊．电子信箱：leizhang_xust@163．com．
