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设计并开展了不同加载速率和不同温度下的沥青砂单轴拉伸试验,针对沥青砂软化行为提出了损伤本构模型,模型参数通过试验确定,利用随机骨料投放技术建立了沥青混合料直接拉伸试件的异质细观结构有限元模型,并利用模型模拟了直接拉伸载荷作用下试件的损伤断裂行为,最后考察了裂纹形成的形态以及骨料分布对混合料直接拉伸损伤破坏行为的影响。研究表明:模型能描述沥青混合料单轴拉伸损伤破坏过程与内部损伤分布;粗骨料分布基本不影响沥青混合料的断裂路径,但影响裂纹尖端附近区域的损伤分布。
The uniaxial tensile test of asphaltic sand under different loading rates and different temperatures was designed and carried out. The damage constitutive model was proposed for the softening behavior of asphaltic sand. The parameters of the model were determined through experiments. The asphalt aggregate was directly set up by random aggregate feeding technology. Tensioned specimens were used to simulate the damage and fracture behavior of the specimens under direct tensile load. Finally, the morphology of the cracks and the effect of aggregate distribution on the direct tensile damage of the mixture Disruptive behavior. The results show that the model can describe the uniaxial tensile damage process and internal damage distribution of asphalt mixture. The distribution of coarse aggregate does not affect the fracture path of asphalt mixture basically, but affects the damage distribution near the crack tip.