爆炸冲击波在建筑群中传播规律的数值模拟研究

为了研究建筑群的布局特性对爆炸冲击波传播的干扰作用及爆炸对周围环境的影响,笔者基于任意拉格朗日多物质流固耦合算法,对空气采用ALE网格,爆轰产物采用JWL状态方程,利用LS-DYNA程序对TNT理想爆炸源的爆炸进行了数值模拟,并与经验公式的计算结果进行了对比,得出了数值模拟方法可行的结论。在该基础上,以一个建筑小区为例,对其遭受爆炸后的响应作了进一步模拟研究。结果表明,建筑物的密度和布局方式对爆炸场的数值与形态都有敏感作用,因此,在城市规划建筑布局阶段,应考虑建筑密度和布局对爆炸冲击波的影响。

Numerical Simulation of Propagation Rules of Blast Shock Wave in Building Cluster

To study the influence of spatial layout of building complex on the propagation rules of shock wave and the effect of explosive blast on the surrounding, the explosion of TNT ideal explosive source was numerically simulated by use of LS-DYNA program on the basis of multi-material fluid-solid interaction algorithm and the JWL state equations for product of explosive detonation. Comparison between the result obtained by numerical simulation and that obtained by empirical formula calculation showed that this simulation was feasible. Based on this point, further simulation was conducted on the response of a building subdistrict after an explosion occurring. Simulation results show that the building density and building layout has significant influence on blast field. Therefore, the effect of building density and building layout on blast shock wave should be considered in the urban planning stage.