基于煤层原始瓦斯含量和压力的割缝钻孔有效抽采半径测定  

Measurement of Effective Drainage Radius Based on Primitive Gas Content and Pressure for Slotted Drilling

作　　者：刘厅[1,2] 林柏泉[1,2] 邹全乐[1,2] 沈春明[1,2] 张震[1,2] 杨威[1,2] 

机构地区：[1]煤炭资源与安全开采国家重点实验室,江苏徐州221116 [2]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《煤矿安全》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)

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.

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 

分 类 号：TD712.6[矿业工程—矿井通风与安全]