沿空留巷双向聚能爆破炮孔间距参数研究  

Study on parameters of blast hole spacing for gob side entry retaining by bidirectional shaped charge blasting

作　　者：时启鹏 郑洪运 王永宝 云明 武善元 李廷春[1] 张浩[1] SHI Qipeng;ZHENG Hongyun;WANG Yongbao;YUN Ming;WU Shanyuan;LI Tingchun;ZHANG Hao(Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China;Shandong Qiuji Coal Mine Co.,Ltd.,Dezhou 272116,China;Shandong Energy Zaozhuang Mining Group Co.,Ltd.,Zaozhuang 277000,China)

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]山东省邱集煤矿有限公司,山东德州272116 [3]山东能源枣庄矿业集团有限责任公司,山东奉庄277000

出　　处：《煤矿安全》2022年第1期219-225,共7页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(41772299)。

摘　　要：为解决沿空留巷中选取合理炮孔间距难题,基于双向聚能爆破成缝机理,建立联孔聚能爆破力学模型,引入聚能管影响参数,分析爆破后岩石裂缝扩展长度,推导炮孔间距计算公式;并以邱集煤矿为工程背景,计算得合理炮孔间距为1.0 m;采用LS-DYNA软件对间距为0.8、1.0、1.2 m的双孔聚能爆破裂缝扩展过程进行模拟。结果表明:在距炮孔中心0.2 m处聚能方向岩石所受应力峰值是非聚能方向的2.6倍,炮孔连心线方向裂缝更易扩展;当炮孔间距为1.0 m时,两孔间裂缝完全贯通且炮孔连线中心无竖向裂缝产生。经邱集煤矿现场试验证明,采用间距为1.0 m的炮孔爆破切顶后,孔内形成连续裂缝,炮孔间裂缝贯通形成切缝面,与理论计算和数值模拟结果相符。In order to solve the problem of selecting reasonable blast hole spacing in gob-side entry retaining,based on the fracture forming mechanism of bi-directional shaped charge blasting,a mechanical model of combined hole shaped charge blasting is established,the influence parameters of shaped charge pipe are introduced,the rock crack propagation length after blasting is analyzed,and the calculation formula of blast hole spacing is deduced.Taking Qiuji Coal Mine as the engineering background,the reasonable blast hole spacing is calculated as 1.0 m.LS-DYNA software is used to simulate the crack propagation process of double hole shaped charge blasting with spacing of 0.8 m,1.0 m and 1.2 m.The simulation results show that the peak stress of rock in the direction of shaped charge blasting is 2.6 times of that in the direction of non-shaped charge blasting at 0.2 m away from the center of the blast hole,and the crack in the direction of the connecting line of the blast hole is easier to expand;when the spacing of the blast holes is 1.0 m,the cracks between the two holes are completely connected and there is no vertical crack in the center of the connecting line of the blast holes.The field test in Qiuji Coal Mine shows that continuous cracks are formed in the holes after blasting with a spacing of 1.0 m,and the cracks between the holes are connected to form a cutting surface,which is consistent with the results of theoretical calculation and numerical simulation.

关 键 词：沿空留巷 双向聚能爆破 炮孔间距 裂缝扩展 数值模拟 

分 类 号：TD235.47[矿业工程—矿井建设]