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利用X射线的断层摄影,得到沥青混合料组成成分的三维内部微观结构,提供集料、玛蹄脂和空隙的精确位置,在此基础上开发二维和三维模型。采用离散单元法(DEM)在二维和三维状态下预测沥青混合料的动态模量,开发并完成一个基于单轴压缩试验的测定玛蹄脂和沥青混合料在不同温度及加载频率下动态模量的试验方案。在该离散元仿真中使用了一个三维离散元的3个重复和二维离散元的6个重复,监测了沥青混凝土在压缩载荷下的应变响应,并计算它的动态模量,然后将三维和二维离散元得到的动态模量和试验测量结果进行比较。结果显示,三维离散元模型成功地预测了在一定温度和加载频率下沥青混合料的动态模量,二维离散元模型对沥青混合料的动态模量预测偏低。
Using X-ray tomography, the three-dimensional internal microstructure of the asphalt mixture is obtained, and the exact location of aggregate, mastic and voids is obtained. Based on this, two-dimensional and three-dimensional models are developed. Using discrete element method (DEM) to predict the dynamic modulus of asphalt mixture in two-dimensional and three-dimensional state, a uniaxial compression test based on the uniaxial compression test was developed to determine the dynamic modulus of mastic and asphalt mixture under different temperature and loading frequency Amount of test program. In the simulation of discrete element, six repetitions of three-dimensional and two-dimensional discrete elements of a three-dimensional discrete element are used. The strain response of asphalt concrete under compressive load is monitored and its dynamic modulus is calculated. Then three-dimensional and The dynamic moduli obtained by two-dimensional discrete element are compared with the experimental measurements. The results show that the three-dimensional discrete element model predicts the dynamic modulus of asphalt mixture at a certain temperature and loading frequency successfully, and the two-dimensional discrete element model predicts the low dynamic modulus of asphalt mixture.