董静,杨一帆,刘云贺,等. 水工沥青混凝土动态抗压尺寸效应试验研究[J]. 水利水运工程学报,2023(4):147-155. doi: 10.12170/20220310002
引用本文: 董静,杨一帆,刘云贺,等. 水工沥青混凝土动态抗压尺寸效应试验研究[J]. 水利水运工程学报,2023(4):147-155. doi: 10.12170/20220310002
(DONG Jing, YANG Yifan, LIU Yunhe, et al. Experimental study on dynamic compressive size effect of hydraulic asphalt concrete[J]. Hydro-Science and Engineering, 2023(4): 147-155. (in Chinese)). doi: 10.12170/20220310002
Citation: (DONG Jing, YANG Yifan, LIU Yunhe, et al. Experimental study on dynamic compressive size effect of hydraulic asphalt concrete[J]. Hydro-Science and Engineering, 2023(4): 147-155. (in Chinese)). doi: 10.12170/20220310002

水工沥青混凝土动态抗压尺寸效应试验研究

Experimental study on dynamic compressive size effect of hydraulic asphalt concrete

  • 摘要: 为研究动态荷载作用下水工沥青混凝土力学性能的尺寸效应规律,在5 ℃的环境温度及10−5/s~10−2/s的应变率条件下,对直径为100 mm、高径比分别为0.5、1.0、1.5和2.0的水工沥青混凝土试样开展了单轴动态抗压试验研究,分析了应变率效应与尺寸效应对沥青混凝土动态抗压强度、弹性模量及破坏模式的影响。结果表明:应变率越大或试样高径比越小,试样破坏越显著;随着高径比的增加,抗压强度减小,而弹性模量增大;随着应变率的增加,抗压强度与弹性模量的动态增强因子呈非线性增长趋势。基于试验研究,综合考虑应变率效应与尺寸效应的协同作用,引入应变率影响因子建立了水工沥青混凝土动态抗压尺寸效应计算模型,并验证了模型的合理性。

     

    Abstract: In order to study the size effect law of mechanical properties of hydraulic asphalt concrete under dynamic load, uniaxial dynamic compressive tests were carried out on hydraulic asphalt concrete samples with a diameter of 100 mm and height-diameter ratios of 0.5, 1.0, 1.5 and 2.0 respectively under the conditions of ambient temperature of 5 ℃ and strain rate of 10−5/s~10−2/s. The strain rate effect and the size effect on the dynamic compressive strength, elastic modulus and failure mode of asphalt concrete are analyzed. The results show that: (1) The greater the strain rate or the smaller the height-diameter ratio of the sample, the more obvious the failure mode of the sample is; (2) With the increase of height-diameter ratio, the compressive strength decreases and the elastic modulus increases; and (3) With the increase of strain rate, the dynamic enhancement factors of compressive strength and elastic modulus increase nonlinearly. Finally, based on the experimental research, considering the synergistic effect of strain rate effect and size effect, and introducing the strain rate influence coefficient, a calculation model of dynamic compressive size effect of hydraulic asphalt concrete is established, and the rationality of the model is verified.

     

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