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选取修正Burgers模型作为沥青混合料的粘弹性本构模型,基于最小二乘法原理对单轴压缩蠕变试验数据进行拟合,获得本构模型的粘弹性参数。考虑温度变化对沥青混合料粘弹性的影响,建立修正Burgers模型的粘弹性参数模型,运用实验数据拟合粘弹性参数模型的分项系数,理论计算考虑温度效应的蠕变柔量,与实验结果对比分析表明,参数模型有较好的适用性,拟合精度高。粘弹性参数模型能将有限的实验数据推广到其他温度工况,节约大量实验,具有很好适用性。
The modified Burgers model is selected as the viscoelastic constitutive model of asphalt mixture, and the uniaxial compressive creep test data is fitted based on the principle of least squares to obtain the viscoelastic parameters of the constitutive model. Considering the influence of temperature on the viscoelasticity of asphalt mixture, the viscoelastic parameter model of modified Burgers model is established. The experimental data are used to fit the partial coefficients of viscoelastic parameter model. The creep compliance of temperature-dependent effect is theoretically calculated, Comparative analysis shows that the parametric model has good applicability and high fitting accuracy. The viscoelastic parameter model can extend the limited experimental data to other temperature conditions, save a lot of experiments and has good applicability.