This paper focuses on the fragmentation of concrete subj ected to detonation load by explosives in borehole under air-decking charge.AUTODYN-2D model is established to investigate the effects of air-decking charge on the fragmentation of concrete.The numerical results show that compared with the fully coupling borehole,air-decking charge can reduce the initial borehole pressure.Therefore the undersize fragmentation zone is reduced.The effects of air-decking locations,ratios, initiation locations,and explosives types are taken into consideration and comparisons among these are performed to demonstrate influences of these parameters.%为了了解空气间隔装药条件下,药柱爆炸对混凝土破碎效应的影响,利用 AUTODYN-2D 软件建立空气间隔装药模型,研究不同条件下的爆破效应.模拟结果表明,与耦合装药相比,空气间隔装药能显著降低炮孔初始压力,因而可减少炮孔周围混凝土的过度破碎.同时也分析了空气柱的位置、长度、起爆位置以及炸药类型对混凝土破碎效应的影响.
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