受采动影响煤层水力冲孔增透技术试验研究  

Experiment Study on Permeability Improvement Technology with Hydraulic Flushing Borehole in Seam Affected by Mining Activities

作　　者：张建[1] 石必明[1] 李平[2] 穆朝民[1] 郭良经[1] 

机构地区：[1]安徽理工大学能源与安全学院,安徽淮南232001 [2]淮南矿业(集团)有限责任公司,安徽淮南232001

出　　处：《煤炭科学技术》2011年第11期55-58,69,共5页Coal Science and Technology

基　　金：国家自然科学基金资助项目(50874005)

摘　　要：以张集矿北区为研究对象,介绍了在保护层开采后未及时进行瓦斯抽采,煤岩体重新压实条件下水力冲孔的现场试验过程,并与仅进行保护层开采的卸压增透和在未受采动影响的实体煤层中进行水力冲孔的卸压增透现场试验效果进行了对比。结果表明,在受采动影响的煤层中进行水力冲孔,对煤层进行二次卸压,可使水力冲孔的有效抽采半径增大到16 m,使瓦斯抽采率提高到46%,并且在受采动影响的煤层中进行水力冲孔可降低水射流的破煤压力。Taking the north area of Zhangji Mine as a study object,the paper introduced the site experiment process of the hydraulic borehole flushing under the recompacted conditions of the coal and rock masses after the protective seam mined with no gas drainage operation conducted on time.A comparison was conducted between the site experiment effects of the pressure releasing and permeability improvement with hydraulic borehole flushing in the coal seam with no mining activities and the pressure releasing and permeability of the protective seam mining.The results showed that the hydraulic borehole flushing conducted in seam with no mining activity influences could have a secondary pressure releasing in the seam and could make the effective drainage radius with the hydraulic borehole flushing increased to 16 m.Thus the gas drainage rate could be increased by 46% and the hydraulic borehole flushing in the seam with no mining influence could reduce the coal breaking pressure of the water jet.

关 键 词：水力冲孔 受采动影响煤层 保护层 二次卸压 增透 水射流 

分 类 号：TD713.34[矿业工程—矿井通风与安全]