地下爆炸对混凝土路面毁伤效应的数值模拟

Numerical Simulation on Damage Effect of Concrete Pavement Caused by Buried Explosions

利用Autodyn软件对普通混凝土路面下的爆炸破坏效应进行了数值模拟,从观测点的累积破坏、速度和峰值压力三方面进行讨论,得到了不同爆炸深度下混凝土路面的损伤区域及应力波随时间和位置的变化规律,结果表明:炸药当量不变,当埋深较小时,爆炸波到达路面时间较早,碎裂颗粒向空中飞散,很快达到速度峰值和压力峰值,混凝土路面形成的较大的爆破漏斗;当埋深较大时,混凝土路面发生严重的隆起与开裂,仅在内部形成爆破腔体。测得的距爆心较远区域的相关数据还验证了最佳爆炸深度的存在。

This paper makes a numerical analysis on the damage effect to the concrete pavement caused by buried explosions with software Autodyn. The damage area of concrete pavement as well as the transition laws of stress wave with time-space in different detonate depths are obtained from analysis of cumulative damage,speed time-history and peak pressure. Combined with simulation result,the paper comes up with a conclusion in the condition of same equivalent explosive charge: if the buried depth is shallow,the explosion wave reaches the pavement earlier and a big blasting carter formed in the surface of pavement,with a phenomenon of explosion particles flying off and the particles reaching peak velocity and peak pressure quickly. If the buried depth is deeper,it will create an internal blasting cavity,which causes uplifting and cracking in the surface of pavement. Furthermore,the information about the situation with same space far away from detonation proves that there is a best detonative depth.