This paper presents a numerical study of thermal shock weakening of granite rock under dynamic loading. A fully 3D numerical scheme based on a combined continuum viscodamage‐embedded discontinuity model and an explicit scheme to solve the underlying thermomechanical problem was developed and validated through numerical examples. First, the dynamic Brazilian disc test is simulated on intact numerical rock. Then, thermal shock‐induced cracking due to a moving external heat flux boundary condition, mimicking experiments based on plasma jet treatment, is numerically predicted. Finally, numerical Brazilian disc test is conducted on the thermal shocked numerical samples. The predicted and experimental weakening effects are in good agreement demonstrating that the present modeling approach has good predictive capabilities. The practical significance of the results is that heat shock pretreatment can substantially enhance rock gravel and rubble crushing.

中文翻译：

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动态载荷作用下花岗岩岩石的热冲击减弱：基于嵌入式不连续性有限元的3D数值建模

本文提出了动态载荷作用下花岗岩岩石热冲击减弱的数值研究。通过数值示例，开发并验证了基于组合的连续介质粘滞性嵌入不连续性模型的完整3D数值方案和解决基本热力学问题的显式方案。首先，在完整的数值岩石上模拟了动态巴西圆盘试验。然后，模拟了基于等离子流处理的实验，预测了由于移动的外部热通量边界条件引起的热冲击导致的开裂。最后，对热冲击数值样本进行了巴西数值盘试验。预测的和实验的减弱效果非常吻合，表明本建模方法具有良好的预测能力。