煤矿安全2019，Vol.50Issue(4)：23-26,31,5.DOI:10.13347/j.cnki.mkaq.2019.04.006
低透气煤层深孔预裂聚能爆破增透试验研究
Experimental Study on permeability Improvement of Deep Hole pre-splitting Cumulative Blasting in Low permeability Coal Seam
摘要
Abstract
In order to improve the permeability improvement effect of deep hole pre-splitting blasting, based on the similarity simulation theory, the experimental model of deep hole pre-splitting blasting of low permeability coal seam was established, and the sample was prepared by using the proportion of similar materials. By monitoring the strain signal of coal seam, the crack propagation characteristics of samples under blasting loading are analyzed. The results show that the blasting sample will produce reverse tension unloading wave under the action of explosion compression load, which will cause the crack expansion of the blasting sample and have obvious penetration effect along the direction of energy collecting charge. Field tests showed that the concentration of gas extraction in the coal seam after permeability improvement by pre-splitting cumulative blasting through deep hole was 1.18 to 3.05 times of the original, the gas extraction flow was 1.2 to 3.3 times of that before blasting, and the extraction radius was 4.5 m.关键词
深孔预裂爆破/聚能装药/增透/控制孔/裂纹扩展Key words
deep borehole pre-splitting blasting/cumulative charge/permeability improvement/control hole/crack growth分类
矿业与冶金引用本文复制引用
高新宇,刘健,张超,张驰..低透气煤层深孔预裂聚能爆破增透试验研究[J].煤矿安全,2019,50(4):23-26,31,5.基金项目
"十三五"国家科技重大专项资助项目(2016ZX05045004-007) （2016ZX05045004-007）
国家安监局资助项目(2018-技装司-安全生产研究-01) （2018-技装司-安全生产研究-01）
