中文摘要：

为了研究两种钻孔有效抽采半径之间存在的差异,以朱集西煤矿11-2煤层为例,采用压力降低法测定了穿层钻孔的有效抽采半径,采用SF6气体示踪现场实测结合COMSOL软件模拟的方法测试了同一煤层顺层钻孔的有效抽采半径。现场测试结果表明,试验煤层在13 k Pa抽采负压、抽采90 d的条件下,穿层钻孔和顺层钻孔的有效抽采半径分别为4.5 m和7.8 m,穿层钻孔的有效抽采半径明显小于顺层钻孔的有效抽采半径,这对抽采设计中合理选择钻孔间距具有十分重要的意义。

英文摘要：

In order to study difference of two effective drainage radius,taking the No. 11-2 coal seam of Zhujizi coal mine as object,the effective drainage radius of cross-measure borehole was measured by use pressure reducing method,and the effective drainage radius of in-seam borehole was determined in the same coal seam by combine SF6 gas trace method with numerical simulation in COMSOL software. The results show that the effective drainage radius of cross-measure borehole and in-seam borehole are 4. 5 m and 7. 8 m respectively under the condition of 13 k Pa drainage negative pressure and 90 d drainage period,and the effective drainage radius of cross-measure hole is less than the one of hole drilled along seam significantly. The result is enormously significant to choose drainage right borehole spacing in drainage design.