快速拼装式防爆墙消波性能数值模拟研究

为研究快速拼装式防爆墙墙后超压分布规律及影响因素,基于2D映射3D网格建模技术,采用AUTODYN有限元软件分别对TNT当量为6.82 kg,爆高1 m、爆距3 m、墙厚0.5 m,墙体高度为1.5 m、2 m、2.5 m的计算模型和比例爆距分别1.58 m/kg~(1/3)、1.28 m/kg~(1/3)、1.05 m/kg~(1/3)的计算模型以及比例爆距为1.05 m/kg~(1/3),爆高1 m、墙高2 m、墙厚0.5 m,爆距为2 m、3 m、4 m的计算模型进行了模拟,分析了墙体高度、比例爆距和炸药位置对墙后超压分布的影响。结果表明:墙体高度增加将显著增强防爆墙消波性能,墙体高度在1.5~2.5 m范围内变化时,墙后消波系数变化较大;随着比例爆距的减小,墙后较远处消波系数有所增大;随着测点高度和爆高增大,测点处受到的防爆墙保护效应将减小。综合考虑以上因素对墙后测点超压的影响,拟合出了计算墙后超压大小的公式,计算结果与数值模拟结果能较好的吻合。

Numerical Simulation on Wave Dissipating Performance of Rapid Assembling Anti-blast Wall

Based on 2D mapping with 3D mesh modeling technology,the finite element software AUTODYN was used to study the distributions of overpressure behind the rapid assembling anti-blast wall and the influence factors. The working conditions includes calculation model of TNT equivalent 6. 82 kg,explosion height 1 m,explosion dis-tance 3 m,wall thickness 0. 5m,wall height 1. 5 m,2 m,2. 5 m and the calculation model of scaled distance 1. 58 m/ kg1 / 3 ,1. 28 m/ kg1 / 3 ,1. 05 m/ kg1 / 3 and the calculation model of scaled distance 1. 05 m/ kg1 / 3 ,explosion height 1m,wall height 2 m,wall thickness 0. 5 m,explosion distance 2 m,3 m,4 m. The effects of wall height,scaled distance and explosive position on overpressure distribution behind the wall were discussed. The results show that the increase of wall height greatly enhances the wave dissipating performance of the anti-blast wall,when the wall height varies within the range of 1. 5 ~ 2. 5 m,and the wave dissipating coefficient changes greatly;with the decrease of the scaled distance,the wave dissipating coefficient increases away from the wall;as the height of measuring point and explosion height increasing,the protective effect of the anti-blast wall at measuring point is reduced. Considering the influence of the factors on overpressure,the formula for calculating overpressure behind the wall fits the numerical simulation result well.