煤层深孔预裂爆破卸压增透效果数值模拟分析  

Numerical Simulation and Analysis of Effect of Stress Release and Permeability Improvement in Coal Seams by Deep-hole Presplitting Explosion

作　　者：刘泽功[1,2] 蔡峰[1,2] 肖应祺[1] 

机构地区：[1]安徽理工大学能源与安全学院,安徽淮南232001 [2]煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001

出　　处：《安徽理工大学学报（自然科学版）》2008年第4期16-20,共5页Journal of Anhui University of Science and Technology:Natural Science

基　　金：国家973计划资助项目(2006CB708408);国家自然科学基金资助项目(50674004);安徽省高校科技创新团队计划资助项目(2006KJ005TD)

摘　　要：针对高瓦斯低透气性煤层,对深孔预裂爆破进行了数值模拟分析研究。再现了爆破过程中,动压冲击震裂、应力波传播与叠加以及爆生气体驱动裂纹扩展的整个过程,系统地分析了控制孔与爆破孔对于爆破卸压增透效果的影响,提出了高瓦斯低透气性煤层深孔预裂爆破的合理间距,为高瓦斯低透气性煤层的瓦斯抽采效率提出了解决方案。深孔预裂爆破为高瓦斯低透气性煤层增透、进而解决高瓦斯低透气性煤层瓦斯抽采难题提供了一条有效的途径。Deep-hole presplitting explosion in coal seams with high gas content and low permeability was numerically simulated and analyzed. Cracks caused by impact of dynamic pressure, propagation and vibration superposition of stress waves, as well as cracks development by explosion gas in explosion process were represented. The influence of oriented hole and explosion hole on effect of stress release and permeability improvement was comprehensively analysed. Reasonable interval between explosive holes for deep-hole presplitting explosion in coal seams with high gas content and low permeability was proposed, which provides a solution for gas drainage from coal seams with high gas content and low permeability. Deep-hole presplitting explosion provides an effective approch to improvement of permeability of coal seam with high gas content and low permeability, and solves the difficult problem of gas drainage from coal seams with high gas content and low permeability.

关 键 词：高瓦斯低透气性煤层 深孔预裂爆破 卸压增透 叠加效应 

分 类 号：TD712.62[矿业工程—矿井通风与安全]