摘要
采用钻屑指标法对煤巷采掘工作面进行突出危险性预测时,常采用φ42煤电钻进行钻孔。而对于某些特定工作面,需采用更大直径的钻孔施工。通过对φ42和φ73钻孔钻屑量和钻屑解析值的对比性试验,对φ73钻孔钻屑指标法临界值进行了研究。
Method of druing index is often used to forecast the coal - outburst in working face. The drilling machine is usually using φ42 coal drilling machine. And the bigger diameter borehole is constructed in special site. By contrast tests of different diameter borehole （φ42 to φ73） , the critical value of index of dring bits （φ73） are analyzed.
出处
《煤炭技术》
CAS
2007年第3期60-62,共3页
Coal Technology
关键词
大直径销孔
钻屑指标法
临界值
突出
big diameter borehole
method of drilling index
critical value
outburst
