快速拼装式防爆墙消波性能数值模拟研究

发布时间：2018-06-21 08:01

  本文选题：爆炸力学 + 防爆墙　； 参考：《爆破》2017年03期

【摘要】：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。
[Abstract]:In order to study the distribution of overpressure behind the wall and its influencing factors, 2D mapping 3D mesh modeling technology is used to model the wall. The calculation model of TNT equivalent of 6.82 kg, explosion height of 1 m, explosion distance of 3 m, wall thickness of 0.5 m, wall height of 1.5 m-1 / 2 m and the proportional detonation distance of 1.58 m / kg / 3 / 1.28 mkg-1 / 3 / 31.05 mkg/ kg / 1 / 3 by using AUTODYN finite element software, and the proportional detonation distance of 1.05 mm2 / kg / 1 / 3) were calculated by using the AUTODYN finite element software. The model of 1 m, 2 m high, 0.5 m thick and 2 m / 3 m explosion distance is simulated. The influence of wall height, proportional detonation distance and explosive position on the distribution of overpressure behind the wall is analyzed. The results show that the wave dissipation performance of explosion-proof wall will be significantly enhanced with the increase of wall height. When the wall height changes in the range of 1.5 ~ 2.5 m, the wave dissipation coefficient behind the wall will change greatly, and the wave dissipation coefficient behind the wall will increase with the decrease of the proportional blasting distance. With the increase of the height and height of the measuring point, the protective effect of the explosion-proof wall on the measuring point will be reduced. Considering the influence of the above factors on the overpressure of the measuring point behind the wall, the formula for calculating the overpressure behind the wall is fitted, and the calculated results are in good agreement with the numerical simulation results.
【作者单位】： 空军工程大学机场建筑工程系;爆炸冲击防灾减灾国家重点实验室;中国航空港建设第三工程总队;
【基金】：国家自然科学青年基金项目(51508568) 爆炸冲击防灾减灾国家重点实验室开放课题(DPMEIKF201409)
【分类号】：O383
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本文编号：2047830