摘要
针对某煤矿煤层抽采难易程度为勉强抽采的11-2煤层,提出了采用顺层钻孔压降法测试,介绍了测试原理及具体方法,并将该方法进行了现场试验,测试结果表明:11-2煤层釆用94 mm钻孔进行煤层瓦斯抽釆,当抽釆负压为16 k Pa,抽采时间为32 d时,其抽釆影响半径为3.5 m,钻孔抽采27 d时影响半径为3 m,抽釆37 d后影响半径为4 m,抽釆45 d后影响半径为5 m.根据抽釆时间与半径之间的幂函数关系,优化了11-2煤层底板顺层钻孔的布置,为该煤矿瓦斯抽采及防治工作提供了重要依据。
The gas extraction of a coal mine 11- 2 coal seam is not easy. Bedding borehole pressure drop method is put forward. The test principle and specific method are intrduced,and the field test is conducted. the test results show that 94 mm drill is used in 11- 2 coal seam to drainage gas. The radius of drainage influence is 35 m when drainage negative pressure is 16 k Pa and drainage for 32 days. The influence radius is 3 m when extraction for 27 days. The influence radius is 4 m when extraction for 37 days. The influence radius is 5 m when extraction for 45 days. According to the power function relationship of drainage time and drainage radius,optimizes the arrangement of11- 2 coal seam bedding drill hole. It provides an important basis for the coal seam gas extraction and prevention and control work.
出处
《山西焦煤科技》
2015年第9期41-44,共4页
Shanxi Coking Coal Science & Technology
关键词
顺层
钻孔
压降法
抽采半径
Bedding
Drill hole
Pressure drop method
Radius of extraction
