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June 3, 2026Journal of Hydraulic Engineering0 citations

Investigation on the scaling effects of damage to concrete gravity dams subjected to underwater explosion

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ZGZheng GAOGWGaohui WANGWLWenbo LU

Key Points

  • This study aims to analyze the damage scaling effects in gravity dams due to underwater explosions, focusing on material heterogeneity.
  • Developed a numerical model for gravity dam underwater explosions using microscopic numerical modeling techniques.
  • Conducted physical model tests to validate the numerical model and examine differences between microscopic and traditional modeling.
  • Analyzed the influence of explosive equivalent, initiation distance, and aggregate particle size on damage scaling effects.
  • Findings indicate a need to maintain a ratio of 'shock wave characteristic wavelength/maximum aggregate size' greater than 15 to mitigate damage scaling effects.
  • Numerical simulations confirm material heterogeneity significantly impacts scaling effects of damage during underwater explosions.
  • Validation through multiple physical model test cases supports the proposed similarity criteria for scaling effects.

Abstract

缩尺模型试验是重力坝水下爆炸研究的重要手段，为提高缩尺试验结果向原型推演的可推性，本文针对材料非均质性引起的毁伤缩尺效应开展研究。基于细观数值建模技术建立重力坝水下爆炸数值模型，开展了重力坝水下爆炸物理模型试验，验证了数值模型的可靠性，探讨了细观数值建模与传统数值建模方式的差异及适用性。基于上述数值模拟方法，分析了混凝土材料非均质性引起毁伤缩尺效应的内在机制，探讨了炸药当量、起爆距离、骨料粒径对毁伤缩尺效应的影响。进一步研究了缩尺效应与冲击波特征波长、骨料粒径的关系，提出基于“特征波长/最大骨料粒径”的重力坝水下爆炸缩尺试验毁伤相似性判据，并通过多个物理模型试验案例验证了该判据的可靠性。结果表明：在重力坝水下爆炸缩尺试验中，应保证“应力波特征波长/最大骨料粒径”大于15，尽可能规避材料非均质性引起的毁伤缩尺效应，使缩尺试验结果与原型结果尽可能相似，增强模型试验结果向原型推演的可推性。

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Cite This Study

GAO et al. (2026) studied this question.

synapsesocial.com/papers/6a1fc3eddee9eb8c0dce57d8https://doi.org/10.3724/j.slxb.20250700
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