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To effectively solve the problems of severe backbreak damage, high oversize block ratio and poor stability of working face side when using large-diameter long-hole caving method in underground stopes, the optimization of axial charge structure was carried out based on the engineering background of three rows of large-diameter long-hole lateral blasting in underground stope of a copper mine in Anhui Province. LS-DYNA was used to establish five numerical models of axial segmented charge structures with three rows of blast holes. By analyzing the damage distribution law and failure volume of rock mass in different zones, the optimal charge structure for backbreak control in each row of blast holes were determined respectively. The numerical simulation results show that the axial charge structure can alter the distribution of explosion energy, thereby regulating the damage distribution and failure range of the rock mass. Considering both rock breaking effect and backbreak control effect comprehensively, it is recommended that the three rows of blastholes adopt axial charge structures with 1 m charge and 1 m air interval, 0.5 m charge and 1 m air interval, and 0.5 m charge and 1.5 m air interval, respectively. The field industrial test results show that after adopting the optimized charge structure, the number of oversize blocks in the collapsed muck pile decrease significantly, the reduction of sonic wave velocity in the rock mass of the imminent blasting zone is about 8.8%, and the rock damage value is basically less than 0.19. This indicates that the rock mass features favorable integrity and slight damage, and the backbreak control effect is remarkable.

, authors=Wenhu Xu¹, Xiang Zhou², Yongfei Ye¹, Lue Fang¹, Wenpeng Wei³, authorsList=Wenhu Xu, Xiang Zhou, Yongfei Ye, Lue Fang, Wenpeng Wei, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1321895013701763198, articleId=1321895013232001148, tenantId=1146029695717560320, journalId=1225396423026438145, language=CN, title=基于轴向装药结构优化的大直径深孔爆破后冲控制研究, columnId=1226462294490657775, journalTitle=矿业研究与开发, columnName=采矿与矿山充填, runingTitle=null, highlight=null, articleAbstract=

为有效解决井下采场在采用大直径深孔崩矿法时，普遍存在的后冲破坏严重、垮落大块率高、工作面边帮稳定性差等问题，以安徽某铜矿地下采场3排大直径深孔侧崩爆破为工程背景，开展轴向装药结构优化研究。采用LS-DYNA建立3排炮孔的5种轴向分段装药结构数值模型，通过分析不同区域岩体的损伤分布规律及破坏体积，分别确定出各排炮孔爆破后冲控制最优的装药结构。数值模拟结果表明：轴向装药结构可改变爆炸能量分布，进而调控岩体的损伤分布及破坏范围；综合考虑破岩效果和后冲控制效果，建议3排炮孔分别选用1 m药包1 m空气间隔、0.5 m药包1 m空气间隔、0.5 m药包1.5 m空气间隔的轴向装药结构。现场工业试验结果表明，采用优化装药结构后，爆堆垮落大块数量明显减少，临爆区岩体声波速度降低约8.8%，岩体损伤值基本小于0.19，表明岩体完整性好、损伤破坏小，后冲控制效果显著。

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许文浒（1994—），男，湖南长沙人，硕士，工程师，主要从事冶金矿山开采技术研究。E-mail:18874111176@139.com

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许文浒（1994—），男，湖南长沙人，硕士，工程师，主要从事冶金矿山开采技术研究。E-mail:18874111176@139.com

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