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以应力封闭壳理论为基础,对花岗岩介质中地下强爆炸产生的应力封闭壳效应进行了数值模拟。以100 t TNT当量的强爆炸为例,模拟了爆后空腔的回弹和封闭壳的动态形成过程,给出了形成稳定封闭壳后的径向应力、环向应力和爆心距的关系。计算了不同爆炸当量形成的应力封闭壳尺寸及其形成时间与爆炸当量的关系。计算结果表明,当空腔膨胀到最大尺寸之后,空腔开始回弹,此时开始形成应力封闭壳;当空腔回弹结束即形成稳定的空腔尺寸时,稳定的应力封闭壳也在该时刻形成;爆炸当量越大,形成的应力封闭壳的范围越大,当爆炸当量低于10 t TNT时,不能形成应力封闭壳。
Based on the theory of stress-closure shell, the stress-sealed shell effect produced by the strong underground explosion in granite media is numerically simulated. Taking the strong explosion of 100 t TNT as an example, the springback of the cavity and the dynamic formation of the closed shell are simulated. The relationship between the radial stress, the circumferential stress and the burst center distance after the formation of the stable closed shell is given. The relationship between the size of the closed shell and the formation time of the closed shell and the equivalent explosive mass was calculated. The calculated results show that when the cavity expands to its maximum size, the cavity begins to rebound and a stress-sealed shell begins to form. When the cavity rebounds and a stable cavity size is formed, a stable stress-sealed shell also forms at this moment The larger the explosive equivalent, the larger the range of stress-sealed shell formed. When the explosive equivalent is lower than 10 t TNT, the stress-sealed shell can not be formed.