基于沥青混合料均匀性分析的有限元劈裂(IDT)仿真研究

Finite element splitting (IDT) simulation based on asphalt mixture uniformity analysis

为研究沥青混合料均匀性对劈裂试验(IDT)的影响,本研究基于数字图像技术提出一种沥青混合料均匀性评价指标,并用该指标评价沥青混合料截面均匀性;构建包含沥青砂浆和集料的二维沥青混合料细观模型,开展有限元虚拟IDT试验,以荷载峰值验证有限元方法的准确性和合理性,有效模拟沥青混合料均匀性对IDT试验中劈裂强度的影响。结果表明,劈裂强度的变异系数与均匀性指标之间具有较好的一致性,均匀性越好,劈裂强度变异系数越小。

In order to study the influence of asphalt mixture uniformity on split test(IDT), an evaluation index of asphalt mixture uniformity is proposed based on digital image technology. A two-dimensional meso model of asphalt mixture including asphalt mortar and aggregate is constructed, and the finite element virtual IDT test is carried out to verify the accuracy and rationality of the finite element method with the peak load, so as to effectively simulate the influence of asphalt mixture uniformity on the splitting strength in IDT test. The experiental results show that there is good consistency between the variation coefficients of splitting strength and the uniformity index. The experimental the consistency is, the smaller the variation coefficient of splitting strength is.