不同炸高爆炸条件地下工程内冲击波传播规律的工程算法

Engineering Algorithm of Shock Wave Propagation Law in Underground Bunker at Various Depths of Explosion

为了获取不同工况下工程内部冲击波的传播规律,采用可拼装式钢结构单元组成地下工程模型进行了48次不同炸高的模拟爆炸试验,在模型结构内部侧壁安装压阻式压力传感器测量冲击波波形,由实测数据拟合了深钻地爆炸条件下地下工程内冲击波正压冲量和正压作用时间的工程算法模型。结果表明,冲击波特征参量的取值主要与覆盖层配筋率、装药的比例炸高与比例爆距、结构横截面比例直径有关;模型相关系数大于0.8,平均误差小于20%,能为地下工程抗爆炸毁伤分析与设计提供荷载依据。

In order to obtain propagation laws of shock wave inside the bunker under different working conditions,48 explosion tests at various buried depths were carried out using an underground engineering model that could be assembled by steel structural units.Waveforms of shock waves were measured by piezoresistive pressure sensors mounted on the sidewall of the structures.From the measured data,distribution formulas on positive pressure impulse and action time of shock wave in the underground bunker under deep drilling explosion conditions were studied.The results show that values of representing characteristic parameters of shock waves are mainly related to the reinforcement ratio of the covering layer,the proportional blast height of the charge,the proportional blast distance and the proportional diameter of the cross section of the structure.Correlation coefficients of fitted algorithms are greater than 0.8,and average errors are less than 20%;therefore the engineering models can provide load basis for analysis and design of underground structures against blast damage.