混凝土板爆破作用数值分析

混凝土板是爆破拆除经常遇到的爆破对象，是建筑物的基本构件．爆炸应力波峰值随距离衰减是工程爆破参数设计的理论依据之一．通过数值计算，研究爆炸应力波峰值随距离的衰减规律．研究结果表明，与无限混凝土介质相比，爆炸应力波峰值在混凝土板中衰减较快．应力波峰值的衰减指数随装药量增大而减小，衰减指数的变化率也随装药量的增大而减小．

NUMERICAL ANALYSIS ON BLASTING EFFECTS IN CONCRETE PLANK

The concrete plank is an object usually found in the demolition blasting. It is the basic piece of structure or building. Attenuation rule of the peak value of explosion stress wave vs. distances is one of the theoretical bases for designing engineering blasting parameters. Through numerical computation, attenuation rule on the peak value of explosion stress wave vs. distances in the concrete plank is studied in this paper. The study results show that the attenuation of explosion stress wave is more rapid in the concrete plank, compared with that in the infinite concrete medium. The attenuation exponent of the peak value of stress wave vs. distance decreases with increase of explosive charge mass. The change ratio of attenuation exponent decreases rapidly with increase of explosive charge. That can explain that big explosive charge mass cannot improve the breaking quality of concrete plank, which will produce strong air shock wave and flying pieces and that the bigger explosive consumption per cubic concrete should be taken, compared with blasting of concrete body, as can be seen from the results in the paper.