Numerical Simulation Study on Failure Zones and Attenuation Behavior of Stress Waves of Cylindrical Charge Explosions in Concrete
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摘要: 以往针对常规武器的抗爆结构设计中,对固体介质中爆炸应力波的研究多针对土壤和岩石介质(即地冲击问题),对混凝土中爆炸应力波的传播与衰减规律研究依然较少。为了探究柱形装药爆炸应力波在混凝土介质中的传播规律,本文基于KCC本构模型和多物质ALE算法开展数值模拟研究。首先,通过与已有的试验数据进行对比,验证了本构模型参数和数值算法的适用性;在此基础上以峰值应力为准则,对装药周围混凝土介质的爆炸破坏分区进行划分,并讨论了各破坏分区中爆炸应力波的衰减规律;随后,分析了装药形状对爆炸破坏分区和爆炸应力波传播规律的影响,并建立了柱形装药爆炸应力波峰值应力计算公式;最后,引入峰值应力耦合系数,定量分析了埋深对爆炸应力波法向峰值应力分布的影响。研究结果表明:各爆炸破坏分区中爆炸应力波衰减规律存在显著差异,与中远区(过渡区和破裂区)相比,装药近区(拟流体区和压碎区)衰减更快,另外柱形装药长径比增加会加快法向峰值应力的衰减;并且建立的爆炸应力波峰值应力计算公式可以较为准确快速地计算出不同形状、不同埋深下柱形装药爆炸应力波法向峰值应力,可为混凝土结构抗爆设计提供参考。
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关键词:
Abstract: In the past, the design of structures resistant to conventional weapons has largely focused on the study of explosion stress waves in solid media, particularly in soil and rock media (i.e., ground shock issues), while the research on the propagation and attenuation of explosion stress waves in concrete remains relatively scarce. To investigate the propagation behavior of stress waves in the near-field of cylindrical charge explosions in concrete, this paper conducts a numerical simulation study based on the KCC constitutive model and the MM-ALE algorithm. Firstly, the applicability of the constitutive model parameters and numerical algorithm is validated by comparing the results with existing experimental data. Subsequently, the impact of charge shape on the explosion failure zone and the propagation behavior of explosion-induced stress waves is analyzed, and a formula for calculating the peak stress of stress waves generated by cylindrical charge explosions is established. Finally, a stress peak coupling coefficient is introduced to quantitatively analyze the impact of burial depth on the distribution of normal peak stress in explosion-induced stress waves. It was found that the attenuation patterns of explosion-induced stress waves differ significantly across various explosion failure zones. In comparison to the mid-field zone (transition and fracture zones), the near-field zone (quasi-fluid and crushing zones) exhibits faster attenuation. Additionally, an increase in the length-to-diameter ratio of the cylindrical charge accelerates the attenuation of normal peak stress. Moreover, the established formula for calculating the peak stress of explosion-induced stress waves enables accurate and rapid calculate of the normal peak stress for cylindrical charges with different length-to-diameter ratios and burial depths. This empirical formula can serve as a valuable reference for blast-resistant design of concrete structures.-
Key words:
- concrete /
- cylindrical charges /
- failure zones /
- explosion stress waves /
- peak stress
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