为解决地下矿开采中二次爆破的炸药单耗高,爆能利用率低、对巷道破坏大等问题,提出了聚能射流爆破不合格大块矿石的方案。利用有限元软件ANSYS/LS-DYNA对聚能射流的形成过程进行了数值模拟,模拟了药型罩锥角,药型罩壁厚及普通民用炸药和药型罩材料对聚能射流形成的影响。结果表明,聚能射流速度随锥角增大而减小,药型罩最佳壁厚随着药型罩锥角的增大而增大。进行了聚能射流破碎大块的现场试验,试验证实用较低爆速的民用炸药替代高爆速炸药、塑料药型罩代替金属药型罩可形成有效射流,可满足地下矿二次爆破破碎不合格大块的要求。 In order to solve the problems of high energy consumption, low utilization rate of explosive energy and large damage to the roadway during the secondary blasting in underground mining, a scheme was proposed to blast unqualified large ores with jet energy. The finite element software ANSYS / LS-DYNA was used to simulate the forming process of the convergent jet, and the influence of the taper angle of the cover, the thickness of the cover and the effect of the common explosive and the cover material on the formation of the converging jet were simulated . The results show that the velocity of converging jet decreases with the increase of taper angle, and the optimum wall thickness increases with the increase of taper angle. The field experiments were carried out on the agglomeration jet agglomeration test. The experiment proved that the replacement of high explosive detonator with the low detonation velocity civil explosive, the plastic type shield instead of the metal type shield can form an effective jet, which can meet the second blasting of underground mine unqualified Large pieces of the request.