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利用Eshelby等效夹杂理论研究了沥青混合料的单轴压缩蠕变行为。通过时间域内的Laplace变换将问题线性化,得到了沥青混合料的蠕变本构关系。开展了不同温度、应力水平条件下沥青砂的单轴压缩蠕变实验,根据数据拟合了沥青砂四参量流变模型的模型参数。在此基础上,预测了沥青混合料在不同温度、应力水平下的蠕变曲线,分析了温度、应力水平对沥青混合料蠕变行为的影响。结果表明:在相同的应力水平下,沥青混合料的应变和应变率都随温度的升高而增大,并且在沥青软化点附近发生明显突变;在相同的温度下,沥青混合料的应变和应变率都随加载应力的增加而增大。
The creep behavior of asphalt mixture under uniaxial compression was studied by Eshelby’s theory of inclusion inclusion. The problem is linearized by Laplace transform in time domain, and the creep constitutive relation of asphalt mixture is obtained. Uniaxial compression creep experiments of tar sands under different temperature and stress levels were carried out. According to the data, the model parameters of four parameters rheological model of asphalt sand were fitted. On this basis, the creep curves of asphalt mixture at different temperature and stress levels are predicted, and the influence of temperature and stress level on the creep behavior of asphalt mixture is analyzed. The results show that under the same stress level, the strain and strain rate of asphalt mixture increase with the increase of temperature, and obvious changes occur in the vicinity of asphalt softening point. At the same temperature, the strain and strain rate of asphalt mixture increase Strain rate increases with increasing loading stress.