平行钻孔有效抽采半径及合理钻孔间距研究

桑乃文; 杨胜强; 宋亚伟

doi:10.13272/j.issn.1671-251x.2019010048

平行钻孔有效抽采半径及合理钻孔间距研究

doi: 10.13272/j.issn.1671-251x.2019010048

桑乃文^{1, 2, 3},
杨胜强^{1, 2, 3},
宋亚伟^{1, 2, 3}

1.
中国矿业大学安全工程学院，江苏徐州221116
2.
中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室，江苏徐州221116
3.
中国矿业大学煤炭资源与安全开采国家重点实验室，江苏徐州221116

基金项目:

国家重点研发计划资助项目（2018YFC0807900）

中国矿业大学双一流建设自主创新专项项目（2018ZZCX05）

详细信息

中图分类号: TD712.6
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出版历程
- 刊出日期: 2019-06-20

Research on effective drainage radius and rational borehole spacing of parallel boreholes

SANG Naiwen^{1, 2, 3},
YANG Shengqiang^{1, 2, 3},
SONG Yawei^{1, 2, 3}

1.
School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
2.
Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221116, China
3.
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China

摘要

摘要: 为确定平行钻孔瓦斯抽采合理钻孔间距，通过推导煤层瓦斯运移方程、煤岩体变形方程及渗流场与应力场耦合方程，建立了瓦斯抽采流固耦合模型；根据某矿21219工作面实际地质条件，利用COMSOL Multiphysics软件对平行钻孔间抽采叠加效应影响下瓦斯压力、有效抽采半径的变化规律进行了数值模拟研究，并结合钻孔有效抽采半径，得出了合理的钻孔间距。数值模拟结果表明，随着钻孔间距的增大，抽采后煤体瓦斯压力增大；随着煤体距钻孔距离减小，煤体瓦斯压力呈先缓慢减小、后快速下降的趋势；随着抽采时间的增加，瓦斯压力不断降低，钻孔有效抽采半径变大。现场应用结果验证了钻孔间距布置的合理性。
- 煤炭开采 /
- 瓦斯抽采 /
- 平行钻孔抽采 /
- 有效抽采半径 /
- 抽采叠加效应 /
- 钻孔间距
Abstract: In order to determine rational borehole spacing of parallel boreholes for gas drainage, a fluid-solid coupling model of gas drainage was established by deducing gas migration equation of coal seam, deformation equation of coal and rock, and coupling equation of seepage field and stress field. According to actual geological conditions of 21219 working face in a mine, variation law of gas pressure and effective drainage radius under influence of drainage superposition effect between parallel boreholes were numerically simulated by COMSOL Multiphysics software, and rational borehole spacing was obtained by combining with effective drainage radius of borehole. The numerical simulation results show that gas pressure of coal body after drainage increases with the increase of borehole spacing. As the distance between coal body and borehole decreases, gas pressure of coal body decreases slowly at first and then decreases rapidly. With the increase of drainage time, gas pressure decreases continuously and effective drainage radius increases. The field application results verify rationality of borehole spacing arrangement.
- coal mining /
- gas drainage /
- parallel borehole drainage /
- effective drainage radius /
- drainage superposition effect /
- borehole spacing