倾斜煤层水力冲孔有效影响半径数值模拟研究
Numerical simulation research on effective influence radius of hydraulic punching in inclined coal seam
【索引】华明国,姚邦华,李建伟.倾斜煤层水力冲孔有效影响半径数值模拟研究[J].工矿千亿国际app下载,2020,46(2):88-93.
【Reference】HUA Mingguo,YAO Banghua,LI Jianwei. Numerical simulation research on effective influence radius of hydraulic punching in inclined coal seam[J].Industry and Mine Automation,2020,46(2):88-93.
【DOI】10.13272/j.issn.1671-251x.2019070040
【作者】华明国1,姚邦华2,李建伟3
【Author】 HUA Mingguo1,YAO Banghua2,LI Jianwei3
【作者机构】1.潞安集团 余吾煤业有限责任公司, 山西 长治046100;2.河南理工大学 安全科学与工程学院, 河南 焦作454000;3.山西晋煤晟泰能源有限公司, 山西 晋城048000
【Unit】1.Yuwu Coal Industry Co., Ltd., Lu'an Group, Changzhi 046100, China; 2.School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;3. Jinmei Group Shengtai Energy Co., Ltd., Jincheng 048000, China
【摘要】针对目前水力冲孔技术研究较少考虑倾斜煤层水力冲孔卸压范围随方向变化的特点及煤层倾角对水力冲孔卸压有效半径影响的问题,以某煤矿3号煤层为研究对象,利用多物理场耦合数值模拟软件COMSOL Multiphysics 对倾斜煤层水力冲孔有效影响半径进行了数值模拟,研究了不同方向上的钻孔有效抽采半径。数值模拟结果表明:在冲孔作用下,抽采影响范围随抽采时间的增加而不断扩大,但扩展速度随时间下降; 在冲孔卸压作用下,煤层渗透性大大增加,钻孔周边影响范围呈近似椭圆形分布; 连续抽采90 d后,上部方向的影响半径为6 m左右,下部方向的影响半径为4 m左右,水平方向的影响半径为5 m左右;为了确保抽采达标,该煤层水力冲孔钻场横向钻孔布置间距设定为3.5 m左右,纵向钻孔布置间距为4.0 m左右。该研究结果对于优化水力冲孔工艺参数、指导抽采钻孔的准确布置、提升矿井的瓦斯治理效果具有重要的现实意义。
【Abstract】Current research on hydraulic punching technology seldom considers that pressure relief range of hydraulic punching in inclined coal seam varies with direction and influence of coal seam inclination on the effective radius of hydraulic punching pressure relief. In view of the above problem,taking the coal seam No.3 of a coal mine as research object, the effective influence radius for inclined coal seam under hydraulic punching was numerically simulated by using multi-physics coupling numerical simulation software COMSOL Multiphysics. The effective extraction radius of borehole in different directions was studied. The numerical simulation results show that under the action of punching, the range of extraction influences continues to increase with the increase of extraction time, but the expansion speed decreases with time. Due to the stress relief under punching, the permeability of coal seam is greatly increased, and the influence range around the borehole is approximately elliptic. After 90 days of continuous extraction, the influence radius is about 6 m in the upper direction, the influence radius is about 4 m in the lower direction and the influence radius is about 5 m in the horizontal direction. In order to reach the gas extraction standard, the horizontal drilling arrangement spacing of the hydraulic drilling tunnel of the coal seam is about 3.5 m, and the longitudinal drilling arrangement spacing is about 4.0 m. The research results have important practical significance for optimizing hydraulic punching process parameters, guiding the accurate layout of extraction boreholes, and enhancing the gas control effect of the mine.
【关键词】 煤炭开采; 倾斜煤层; 瓦斯抽采钻孔; 水力冲孔; 有效影响半径; 煤体变形-渗流气固耦合模型
【Keywords】coal mining; inclined coal seam; gas extraction and borehole; hydraulic punching; effective influence radius; gas-solid coupling model of coal deformation and gas seepage
【文献出处】工矿千亿国际app下载,2020年2期
【基金】“十三五”国家科技重大专项项目(2016ZX05067006-001);国家自然科学基金项目(U1704129);河南省高校基本科研业务费专项资金资助项目(NSFRF180330)
【分类号】TD713
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