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为了从细观角度描述沥青混合料中集料和砂浆的矢量场随加载时间的变化,以简单性能试验(SPT)测定沥青混合料的动态模量和相位角,采用数字图像处理和Matlab提取沥青混合料截面图像的像素坐标,利用离散元方法重构沥青混合料数字试件,在验证数字试件合理性的基础上,通过追踪集料和砂浆的位移场和速度场,分析了不同加载时间集料和砂浆矢量场的差异。研究结果表明:沥青混合料动态模量的预测值与实测值仅相差4.76%,相位角的预测值与实测值的差异为8.57%;集料和砂浆的位移场方向主要沿竖向向下,由上至下位移减小,整体集料与典型集料、整体砂浆与典型砂浆的最大位移相差较小,最大差异分别为5.20%和2.45%,砂浆的位移稍大于集料;随着加载时间的增大,整体集料和砂浆、典型集料和砂浆的最大速度均逐渐增大,砂浆的速度基本大于集料。
In order to describe the change of vector field of aggregate and mortar in asphalt mixture with loading time from the microscopic point of view, the dynamic modulus and phase angle of asphalt mixture were determined by simple property test (SPT), and the asphalt was extracted by digital image processing and Matlab By using the discrete element method to reconstruct the digital specimen of asphalt mixture, on the basis of verifying the rationality of digital specimen, by tracking the displacement field and velocity field of aggregate and mortar, the influence of different loading time Differences between aggregate and mortar vector field. The results show that the predicted value of dynamic modulus of asphalt mixture is only 4.76% less than the measured value, and the difference between predicted value and measured value of phase angle is 8.57%. The direction of displacement field of aggregate and mortar is mainly vertical downward, The displacement of the whole aggregate and the typical aggregate, the difference between the maximum displacement of the whole mortar and the typical mortar is small, the maximum differences are 5.20% and 2.45%, respectively, and the displacement of the mortar is slightly larger than that of the aggregate; as the loading time Of the total increase, the overall aggregate and mortar, the typical aggregate and the maximum velocity of mortar are gradually increased, the mortar speed is greater than the aggregate.