有限厚混凝土靶内部爆炸震塌贯穿研究

Study on the Collapse Perforation of Thick Concrete Targets Under Internal Explosion

设计了8种不同埋深的装药在混凝土靶内部爆炸,通过调整装药量,研究有限厚度混凝土靶背面的临界震塌条件.试验得到了一定装药条件下有限厚混凝土靶的临界震塌厚度和相应的临界装药量.通过量纲分析理论对试验数据进行了归一化处理,并得到了量纲一的临界震塌厚度与装药长径比(量纲一的装药量)之间的关系.分析表明,当装药密度和装药直径一定时,有限厚混凝土靶的临界震塌厚度随着装药量(装药长度)的增加而呈现非线性递增趋势;当装药长径比大于5时,临界震塌厚度的增加趋势明显减慢,一定装药直径下混凝土靶存在极限临界震塌厚度.

To investigate the failure condition of critical collapse of the concrete target with finite thickness, the experiments on concrete targets with different buried depth of explosive charge under internal explosion were performed by changing the amount of explosive charge. The critical collapse thickness and critical amount of explosive charge were obtained at a certain condition of cylindrical explosive charge. With the obtained experiment data, the relationship between the critical collapse thickness and critical length-to-diameter ratio of explosive charge was found by using the dimensional analysis theory. The result implies that, as the density and diameter of explosive charge is fixed, the critical collapse thickness of concrete targets increases non-linearly with the increase of critical length-to-diameter ratio. When the length-to-diameter ratio of cylindrical explosive charge is larger than 5, the increasing tendency of critical collapse thickness is getting slower and slower. Therefore, there exists a limit of critical collapse thickness under a fixed diameter of cylindrical explosive charge.