变埋深条件下混凝土中爆炸加速度的传播规律

摘要

为了研究混凝土中不同埋深爆炸冲击质点振动加速度传播规律，运用量纲分析和自由场实验相结合的方法并引入等效当量系数的概念得出 C30混凝土不同埋深爆炸冲击质点振动加速度预估公式。研究结果表明：对于 C30混凝土，当装药比例埋深为0．25 m／kg1／3≤h≤1．0 m／kg1／3时，随着装药比例埋深的增加，爆炸冲击质点加速度峰值随之增大，但加速度随比例埋深的衰减规律基本一致；对于不同强度的混凝土触地爆（h ＝0 m／kg1／3），随着混凝土强度的增大，爆炸冲击质点加速度峰值随之增大，加速度衰减规律基本一致；给出了 C30混凝土不同埋深爆炸冲击质点振动加速度精度较高的预估公式。%In order to investigate the acceleration of concrete at different scaling depth of burst (SDOB),an empirical formula of impact acceleration was deduced by using the combination of free field experiment and dimensional analysis,together with inducting the concept of DOB coefficient of equivalent yield.The results show that when SDOB is form 0.25 m /kg1 /3 to 1 .0m /kg1 /3 ,the peak of impact acceleration of C30 concrete at blasting point increases along with the increases of SDOB,but the attenuation of shock acceleration of concrete is almost in the same way at different SDOB. The peak of impact acceleration increases with the increase of concrete strength,and the attenuation of acceleration is also in concert for different concrete strength.The obtained empirical formula for C30 concrete is of high degree of accuracy for predicting the shock acceleration.