羊东矿瓦斯抽采半径考察研究

为了考察羊东矿瓦斯抽采半径,以合理布置抽采间距。通过压降法测定穿层钻孔瓦斯有效抽采半径,同时用SF6气体示踪法现场实测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12kPa抽采负压,抽采半径6.5m时两种抽采方式的抽采天数分别为75d,61d。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。

In order to determine the extraction radius of Yangdong coal mine,the effective extraction radius of the drill hole through the seam was measured by the pressure drop method,and the effective extraction radius of the drill hole along the seam was measured by the SF6 gas tracing method in the field.The field test results show that the extraction days of the two methods are 75d and 61d respectively when the negative pressure is 12kPa and the extraction radius is 6.5m.The effective extraction radius of the through hole is obviously smaller than that of the along hole,which is very important for the reasonable selection of the drilling spacing in the extraction design.