高温后花岗岩-混凝土组合体动态压缩破坏特征与能量耗散研究

doi:10.16552/j.cnki.issn1001-1625.2024.1196

摘要/Abstract

摘要： 为探究高温后花岗岩-混凝土组合体的动态破坏特征及能量耗散特征,采用分离式霍普金森压杆(SHPB),以温度(20、200、400、600 ℃)和冲击速度(8、10、12 m/s)为变量,开展组合体动态压缩试验。结果表明:高温显著降低了组合体的动态抗压强度,且随着温度的升高,组合体冲击破碎程度加剧;特别是在600 ℃加热后,组合体动态抗压强度较20 ℃下降39.64%及以上;冲击速度的增加导致组合体动态抗压强度和能耗密度提高,存在显著的应变率效应;平均破碎粒径与冲击速度和能耗密度呈负相关,即更高的冲击速度导致更细小的破碎粒径;分形维数的变化规律揭示了高温和冲击速度对组合体破坏模式的影响,其中600 ℃时的分形维数达到最大值,反映出高温加剧了组合体内部结构的损伤。研究结果对于理解和预测高温环境下岩石-混凝土结构的动态响应具有一定的参考价值。

关键词: 花岗岩-混凝土组合体, 高温损伤, 动态抗压强度, 耗能特征, 分形维数

Abstract: In order to investigate the dynamic failure and energy dissipation characteristics of granite-concrete composite under high temperature, dynamic compression tests were conducted using a split Hopkinson pressure bar (SHPB) with temperature (20, 200, 400, 600 ℃) and impact velocity (8, 10, 12 m/s) as variables. The results show that high temperatures significantly reduce the dynamic compressive strength of composite, and with increasing temperature, the extent of impact fragmentation intensifies. Specifically, after heating to 600 ℃, the dynamic compressive strength of composite decreases by 39.64% or more compared to 20 ℃. The increase in impact velocity leads to higher dynamic compressive strength and energy density of composite, indicating a significant strain rate effect. The average fracture particle size is negatively correlated with impact velocity and energy density, meaning higher impact velocities result in finer particle sizes. The variation of fractal dimension reveals the effect of high temperature and impact velocity on the failure mode of composite. At 600 ℃, the fractal dimension reaches its maximum value, indicating that high temperature exacerbates the internal structural damage of composite. The research results provide valuable insights for understanding and predicting the dynamic response of rock-concrete structures in high temperature environments.

Key words: granite-concrete composite, high temperature damage, dynamic compressive strength, energy dissipation characteristic, fractal dimension

中图分类号:

TU45

章欣宇, 蒲传金, 周航, 韩森, 冉正熙, 李小双, 肖定军. 高温后花岗岩-混凝土组合体动态压缩破坏特征与能量耗散研究[J]. 硅酸盐通报, 2025, 44(5): 1646-1655.

ZHANG Xinyu, PU Chuanjin, ZHOU Hang, HAN Sen, RAN Zhengxi, LI Xiaoshuang, XIAO Dingjun. Dynamic Compression Failure Characteristics and Energy Dissipation of Granite-Concrete Composite after High Temperature[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1646-1655.

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