摘要
针对低透气性煤层瓦斯难以抽采技术难题,以江西涌山煤矿抽采瓦斯钻孔为研究对象,依循聚能爆破原理,采用LS-DYNA软件模拟高能复合射孔弹产生高能气体侵彻煤层应力变化与裂缝拓展情况,得到高能复合射孔弹侵彻煤层深度,同时设计一种适用煤矿井下钻孔的高能复合射孔弹弹架及其固封装置,最终在煤矿井下试验成功.模拟研究与现场试验结果表明:高能复合射孔弹爆破压裂具有一定的方向性;压裂出的裂缝以纵向裂缝为主,同时随着射流动能降低,纵向裂缝也逐渐尖灭,浸彻煤层深度(即压裂影响半径)约1.65 m;同一射孔弹架中的多个射孔弹起爆后形成的金属射流相互影响较小,且金属射流对压裂孔周围煤层的扰动随着金属射流与压裂孔壁距离的加大而逐渐减弱.
Aiming at the difficult technical problem of gas drainage in low permeability coal seam,taking Yongshan Coal Mine gas drainage borehole of Jiangxi Coal Industry Group Co.,Ltd.as the research object,according to the principle of shaped charge blasting,LS-DYNA software is used to simulate the stress change and fracture expansion of high-energy gas produced by perforating charge penetrating into coal seam,and the penetration depth of shaped charge penetrating into coal seam is obtained.At the same time,a kind of perforating charge frame and its sealing device suitable for coal mine borehole are designed.The coal mine underground test is successful.The results of simulation study and field test show that the high-energy composite perforating charge blasting fracturing has certain directionality;the fractured fractures are mainly longitudinal fractures,and with the decrease of jet kinetic energy,the longitudinal fractures gradually pinch out,and the penetration depth,i.e.fracturing radius of coal seam is about 1.65 m.The metal jet formed by multiple perforating charges in the same frame has few influence on each other,and the disturbance of the metal jet to the coal seam around the fracturing hole gradually weakens with the increase of the distance between the metal jet and the fracturing hole wall.
作者
易光藕
张小军
廖文德
叶小军
YI Guang ou;ZHANG Xiaojun;LIAO Wende;YE Xiaojun(Jiangxi Provincial Institute of Coal Industry Science,Nanchang 330036,China;Jiangxi Academy of Emergency Management,Nanchang 330095,China;Jiangxi Disaster Reduction and Preparedness Center,Nanchang 330105,China;School of Mechanical and Electrical Engineering,Nanchang University,Nanchang 330103,China)
出处
《矿业工程研究》
2021年第3期60-65,共6页
Mineral Engineering Research
基金
江西省科技计划基金资助项目(20133ACG70009)。
关键词
高能复合射孔
煤矿井下
增透技术
high energy composite perforation
underground coal mine
anti-reflection technology
