水力冲孔强化增透松软低透突出煤层效果分析  

Effect Analysis of Strengthening Permeability in Soft and Low Permeability Outburst Coal Seam by Hydraulic Flushing

作　　者：范迎春[1] 王兆丰[1] 

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454000

出　　处：《煤矿安全》2012年第6期137-140,共4页Safety in Coal Mines

基　　金：国家科学自然基金资助项目(50974056);2009年度河南省科技计划资助项目(092192310037)

摘　　要：以罗卜安煤矿为研究背景,在预抽煤层瓦斯前,采用水力冲孔措施对煤层进行增透。为了分析水力冲孔对松软低透突出煤层的增透效果,特对水力冲孔前后钻孔瓦斯涌出特征、煤层透气性系数和钻孔抽放有效影响半径的差异性进行了对比研究,结果表明:水力冲孔后钻孔初始瓦斯涌出量提高了6倍,百米极限瓦斯流量提高了46倍,钻孔瓦斯涌出衰减系数降低了85%,煤层的透气性系数提高了53.48倍,钻孔抽放有效影响半径提高了2～3倍。Taking Luoboan coal mine as the research background,the hydraulic flushing is used to strengthen permeability in coal seam before pre-drainage coal seam gas.In order to analyze the permeability effect of hydraulic flushing in soft and low permeability outburst coal seam,the drilling gas emission characteristics before and after hydraulic flushing,coal seam gas permeability coefficient and the differences of efficient influence radium of drillings gas drainage are analyzed and studied.The results showed that the drillings initial gas emission raised 6 times;limit gas flow of 100 m increased 46 times;the attenuation quotient of drilling gas emission reduced by 85%;the gas permeability coefficient of coal seam increased 53.48 times;the efficient influence radium of drilling raised 2 times to 3 times.

关 键 词：水力冲孔 强化增透 透气性系数 有效影响半径 瓦斯抽放 

分 类 号：TD713[矿业工程—矿井通风与安全]