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沥青混合料为典型夹杂体材料,其宏观材料设计方法较大程度上忽视了混合料细观不均匀性的影响。因此,该文通过沥青混合料劈裂试验的细观模拟分析,从而获得其细观分布规律。首先,基于数字图像处理技术,实现劈裂试验剖面图的二值化并建立细观有限元模型,然后通过材料试验获得断裂参数;其次,通过室内沥青混合料劈裂试验的数字散斑测量,完成细观劈裂试验的模型验证;最后,基于劈裂模型的有限元模拟,分析细观尺度下力学响应的分布规律。结果表明:水平拉应变集中出现在沥青砂浆相且沿界面传递,砂浆与界面区为抗拉薄弱区。
Asphalt mixture is a typical inclusion material. The macro-material design method largely neglects the influence of the mesoscopic heterogeneity of the mixture. Therefore, through the meso-simulation analysis of the asphalt mixture splitting test, the law of meso-distribution is obtained. First of all, based on the digital image processing technology, the binarization of the splitting test profile was realized and the mesoscopic finite element model was established. Then the fracture parameters were obtained through the material test. Secondly, by the digital speckle measurement of the indoor asphalt mixture splitting test, Finally, based on the finite element simulation of splitting model, the distribution of mechanical response at the meso-scale was analyzed. The results show that the horizontal tensile strain concentrates in the asphalt mortar phase and propagates along the interface, and the mortar and the interface region are the tensile weak areas.