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中文摘要：
为了表征沥青混合料的力学行为，以不可逆热力学理论为基础，推导出沥青混合料粘弹-粘塑性损伤本构模型；将建立的本构模型用于分析沥青混合料三轴蠕变试验和等应变速率压缩试验。结果表明：该模型能够合理描述沥青混合料蠕变试验的三阶段，准确表征其三维变形特征，并能从机理上分析沥青混合料的变形行为；可以较准确地预估等应变速率压缩试验中的应力-应变发展规律及应力峰值和体积变形规律；所提出的粘弹-粘塑性损伤本构模型能够表征沥青混合料在多种压缩加载模式下的力学行为特征。
英文摘要：
In order to find out the mechanical behavior of asphalt mixtures, a viscoelastic- viscoplastic damage constitutive model for asphalt mixtures was derived based on the irreversible thermodynamics theory. The developed model was applied to analyze triaxial creep tests and constant strain rate compressive tests on asphalt mixtures. The results show that the model can reasonably describe the three stages of creep tests, and accurately reveal the three-dimensional deformation characteristics; the deformation behavior of asphalt mixtures can be analyzed mechanically using the constitutive model; this model can also effectively predict the stress-strain relation, the peak stress value and the development of volumetric deformation in constant strain rate compressive tests. It is indicated that the constitutive model can reveal the mechanical behavior of asphalt mixtures under various compressive loading conditions.
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