Influence of Chamber Volume on Explosion Effect
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摘要:为了研究爆腔体积变化对爆炸效果的影响，采用聚甲基丙烯酸甲酯（PMMA）板作为被爆介质，在炸药量相同的情况下，改变起爆点爆腔体积，使用超动态应变仪测量PMMA板表面应变演化规律，通过分形维数研究了爆破附近裂纹扩展情况。结果表明：随着爆腔体积的增加，炮孔附近测得的应变峰值逐渐减小，炮孔附近裂纹数量以及长度减小，爆生裂纹分形维数与爆腔体积负相关。
Abstract:In order to study the effect of chamber volume change on the explosion effect, polymethylmethacrylate (PMMA) plate was used as the detonation medium. With the same amount of explosive, the chamber volume at the initiation point was changed, and the surface strain evolution of PMMA plate was measured by super dynamic strain gauge. The crack propagation near the explosion was studied by fractal dimension. The results show that with the increase of cavity volume, the peak strain near the blast hole decreases gradually, the number and length of cracks near the blast hole decrease, and the fractal dimension of blasting cracks is negatively correlated with the cavity volume.
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