摘要
为了准确测定割缝钻孔的有效抽采半径,基于煤层原始瓦斯含量和压力,通过将预抽率>30%与残余瓦斯含量<8 m3/t这2个消突指标相结合,提出了新的割缝钻孔有效抽采半径判定指标:当煤层原始瓦斯含量<11.3 m3/t时,将压降大于煤层原始瓦斯压力的50%作为确定有效抽采半径的指标;当煤层原始瓦斯含量>11.3 m3/t时,将压降>64/q2作为确定有效抽采半径的指标。在杨柳煤矿进行了现场试验,最终确定割缝钻孔的有效影响半径为5 m。通过对抽采指标及残余瓦斯含量的考察,验证了上述指标的有效性和可靠性。
In order to accurately determine the effective drainage radius of slotted drilling, based on the primitive gas content and pres- sure of coal seam, it combined the two outburst elimination indexes together, which included the pre -pumping rate 〉 30% and resid- ual gas content 〈 8 m^3/t and put forward the new indicator which could be used to measure the effective drainage radius of slotted drilling. When the primitive gas content was less than 11.3 m^3/t, it determined the effective drainage radius as the gas pressure has reduced to more than 50% of the primitive gas pressure; While the primitive gas content was more than 11.3 m3/t, it determined the ra- dius as the gas pressure reduced to more than 64/q2 of the primitive gas pressure. Through the field experiment in Yangliu Coal Mine, it finally determined that the effective drainage radius of slotted drilling was 5 m. By studying the indicators of gas drainage and the residual gas content, it verified the effectiveness and reliability of the indicators.
出处
《煤矿安全》
CAS
北大核心
2014年第8期8-11,共4页
Safety in Coal Mines
基金
国家重点基础研究发展计划(973计划)资助项目(2011CB20120)
国家自然科学基金资助项目(51074161)
"十二五"国家科技支撑计划资助项目(2012BAK04B07)
关键词
割缝钻孔
有效抽采半径
原始瓦斯含量
瓦斯压力
判定指标
slotted drilling
effective drainage radius
primitive gas content
gas pressure
judging indicator
