低透气性煤层深孔预裂爆破增透数值模拟研究  

Numerical simulation of improving permeability for deep-hole pre-splitting blasting in low permeability coal seam

作　　者：张天军[1] 王宁[1] 李树刚[2] 徐刚[2] 

机构地区：[1]西安科技大学理学院,陕西西安710054 [2]西安科技大学能源学院,陕西西安710054

出　　处：《西安科技大学学报》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)

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.

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 

分 类 号：TD235.371[矿业工程—矿井建设]