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水工沥青混凝土动态抗压尺寸效应试验研究
董静,杨一帆,刘云贺,孟霄,宁致远
西安理工大学 西北旱区生态水利国家重点实验室
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-110-2 s-1的应变速率条件下,对直径为100mm、高径比分别为0.5、1、1.5和2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的动态抗压强度、弹性模量及破坏模式的影响,结果表明:应变速率越大或试样高径比越小,试样破坏形态显著;随着高径比增加,抗压强度减小,而弹性模量提高;随着应变速率增加,抗压强度与弹性模量的动态增强因子呈非线性增长趋势。最后,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影响,引入应变率影响系数,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。研究结果可供水工沥青混凝土的科学研究和工程应用参考。
关键词:  水工沥青混凝土  动态抗压  破坏模式  应变率效应  动态尺寸效应
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基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
Experimental study on dynamic compressive size effect of hydraulic Asphalt concrete
Dong Jing1,2,3, Yang Yifan1,2,3, Liu Yunhe1,2,3, Meng Xiao1,2,3, Ning Zhiyuan1,2,3
1.State Key Laboratory of Eco-hydraulic in Northwest Arid Region,Xi'2.'3.an University of Technology
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 diameter of 100 mm and height diameter ratio of 0.5, 1, 1.5 and 2 respectively under the conditions of ambient temperature of 5℃ and strain rate of 10-5 s-1~10-2 s-1. The effects of strain rate effect and size effect on the dynamic compressive strength, elastic modulus and failure mode of asphalt concrete are analyzed. The results show that 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; With the increase of height diameter ratio, the compressive strength decreases and the elastic modulus increases; 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, the calculation model of dynamic compressive size effect of hydraulic asphalt concrete is established, and the rationality of the model is verified. The research results can be used as a reference for scientific research and engineering application of water supply asphalt concrete.
Key words:  hydraulic asphalt concrete  dynamic compression  failure mode  strain rate effect  dynamic size effect
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