为了提高混凝土中爆炸毁伤效果,在现有的爆炸抛掷特性理论的基础上,建立了不同起爆条件下介质碎屑抛掷驱动的数学模型,进而计算了混凝土中近地表及远地表两种工况下的碎屑抛掷驱动特性。结果表明:同近地表起爆相比,远地表起爆时目标碎屑受到坑道壁面的约束,增加了碎屑颗粒的运动阻尼特性,限制了爆炸对混凝土碎屑的抛掷效果,因此介质碎屑的直接抛掷驱动能力较差。

In order to improve the damage efficiency of concrete, on the basis of the theory of the existing explosion throwing character, established mathematical model of medium debris throwing driven under the different kinds of working condition of initiation. According to the established mathematical model, calculating the debris throwing driven character under of near-ground-surface and far-ground-surface initiation condition. The results showed that comparing with near-ground-surface explosion, for far-ground-surface initiation, due to constraining of tunnel wall, damping effect increased significantly, limit the explosion of concrete debris throwing effect, thereby the directly throwing driven ability of medium debris is poor.