摘要
针对高瓦斯低透气性煤层瓦斯超限影响煤巷掘进速度问题,建立深孔预裂爆破三维有限元模型进行数值模拟研究。模拟结果表明,深孔预裂爆破经历了冲击波冲击煤岩产生裂纹、稀疏波使煤体裂纹扩展以及爆轰气体驱动裂纹扩展3个过程(0～5 ms),增透深孔预裂爆破爆破孔合理间距为3～5 m.
Aiming at the problem that the gas overrun influences tunneling speed of coal roadway in high gassy and low permeability coal seam, a three-dimensional finite element model was built to present a study on numerical simulation. The study results show that the deep-hole pre-splitting blasting experiences three processes in 5ms, cracking caused by shock wave lashing coal-rock and crack propagation driven by sparse wave and explosion gas. The study also reveals reasonable interval （3 -5 m） between explosive holes of deep-hole pre-splitting blasting is for permeability enhancement and the technique can improve the effect of gas extraction and increase coal seam permeability.
出处
《西安科技大学学报》
CAS
2013年第1期1-6,共6页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金项目(51174158
51174157
51104118)
陕西省教育厅科研计划资助项目(2010JK692)
关键词
低透气性煤层
深孔预裂爆破
煤巷快速掘进
增透技术
low permeability coal seam
deep-hole pre-splitting blasting
coal lane speedy drivage
permeability enhancement technique
