摘要
为了研究含瓦斯煤体中负压钻孔的抽采效果,同时了解多钻孔布孔时钻孔的有效抽采范围,以某矿为研究背景,基于孔-裂隙双重介质多孔模型下的瓦斯流动理论,构建了气-固耦合模型,结合该煤矿实际生产情况,运用COMSOL数值模拟软件,研究了单一顺层钻孔抽采时的有效抽采半径,并以此布孔间距为设计前提,研究了多钻孔并排布孔时对有效抽采范围的影响。研究结果表明:该煤矿抽采时长为150 d时,其有效抽采半径约为1.1 m;以1.56 m,2.20 m,3.00 m,4.00 m和5.00 m为布孔间距进行研究时,受钻孔间的相互影响,煤层瓦斯抽采效果均有不同程度增强,可以根据煤层构造情况以及矿井实际生产状况,设置不同的布孔间距。
To study the extraction effect of negative pressure drilling in gas-containing coal bodies and understand the effective extraction range of drilling in arranging multiple boreholes,taking a mine as the research background,this paper constructs a gas-solid coupling model based on the gas flow theory under the pore-fissure dual-medium porous model.Combined with the actual production,we used COMSOL numerical simulation software to study the effective extraction radius of the single bedding borehole.Taking the borehole spacing as the design premise,we studied the multiple borehole effects of parallel arrangement in the effective drainage range.The results show that when the extraction duration is 150 days,its effective drainage radius is approximately 1.1 m;with borehole spacing of 1.56 m,2.20 m,3.00 m,4.00 m,and 5.00 m,the gas extraction effect is enhanced to different degrees due to the interaction between boreholes.Therefore,different borehole spacing can be set according to the coal seam structure and the actual production conditions.
作者
沈建廷
杨华富
SHEN Jianting;YANG Huafu(Lvtang Coal Mine Co.,Ltd.,Guizhou Mining Industry Co.,Ltd.,Shandong Energy Group,Bijie 551700,China)
出处
《山西煤炭》
2024年第2期111-116,共6页
Shanxi Coal
关键词
瓦斯抽采
气-固耦合模型
布孔间距
gas extraction
gas-solid coupling model
borehole spacing
