周边眼聚能爆破参数数值模拟研究

Study on numerical simulation on shaped charge blasting parameters of peripheral holes

为了研究聚能管壁厚和切缝宽度对聚能爆破效果的影响,采用数值模拟软件ANSYS/LSDYNA建立了单孔爆破几何模型,获得了爆破时应力变化过程,分析了聚能管壁厚、切缝宽度及其与炸药耦合情况对岩石应力状态的影响;建立了双孔爆破几何模型,对比分析了有无聚能管情况下的应力状态。研究结果表明:采用带有切缝的聚能管,炸药起爆后能够优先从切缝处产生聚能射流,增强了周边眼连线上应力场的叠加作用,爆破应力为无聚能管爆破时的1.4倍;非耦合装药条件下,聚能管最优切缝宽度为4 mm;耦合装药时破岩效率高于不耦合装药,最优壁厚为3 mm。

In order to study the wall thickness and the slit width of shaped charge tube affected to the shaped charge blasting effect,the numerical simulation software-ANSYS/LS-DYNA was applied to establish a blasting geometric model of a single hole. A stress variation process during the blasting period was obtained. The paper had an analysis on the wall thickness and the slit width of the shaped charge tube as well as the explosive coupling condition affected to the rock stress state. A blasting geometric model of the double holes was established and a comparison analysis was conducted on the stress state under the condition with a shaped charge tube or without shaped charge tube. The study results showed that the shaped charge tube applied with the slits would be in a first priority to cause the shaped charge jets from the slits after the explosive was detonated and could enhance the superimposition of the stress filed along the connecting line of the peripheral holes. The blasting stress could be 1.4 times higher than a blasting without shaped charge tube. Under the condition of a noncoupling charge,the best slit width of the shaped charge tube was 4 mm. Under the condition of the coupling charge,the rock breaking efficiency would be higher than the uncoupling charge. The best wall thickness of the tube was 3 mm.