考虑温度效应的沥青混合料粘弹性力学模型

VISCOELASTIC CONSTITUTIVE MODEL OF ASPHALT MIXTURE CONSIDERING TEMPERATURE EFFECT

提出一种同时考虑时间和温度效应的沥青混合料本构模型,基于传统的Burgers模型,得到新模型的粘弹性力学参量.采用4种温度下的实验数据对模型参数进行标定,运用新的本构模型对实验结果进行拟合,拟合曲线比传统的Burgers模型拟合曲线更加吻合实验数据,能更好地反应沥青混合料的物理力学行为,同时新模型的物理意义更明确.本模型为进一步研究沥青路面的路用性能和破坏机理提供了新的理论工具,丰富了粘弹性力学理论.

This essay puts forward a constitutive model of asphalt mixture,which takes temperature as well as time into account.And with the help of traditional Burgers model,corresponding viscoelastic mechanics parameters were gained.This model was verified with four different kinds of temperature experiment data,and the experiments were fitted with the new constitutive model.The fitting curves gained by the model matched experiment data better than those obtained by traditional Burgers model,thus revealing mechanical behaviors of asphalt mixture more closely.Meanwhile the physical interpretation of the new model is more explicit.This model provides a new way to study the pavement performance and failure mechanism of flexible pavement and enriches viscoelastic mechanics theory accordingly.