低温高应力下水工沥青混凝土粘弹特性实验研究

Experimental Study of Viscoelastic Properties of Hydraulic Asphalt Concrete at Low Temperature and High Stress

为研究水工沥青混凝土材料在低温高应力下粘弹特性,进行了不同温度和不同应力作用下材料的压缩蠕变实验.选择4种常见的粘弹性本构模型,编制非线性拟合程序,进行模型方程与实验曲线拟合,对比分析不同模型优缺点,得到最优模型并进行其参数与不同温度和加载应力的关系研究,结果表明,Burgers模型可以很好的反映水工沥青混凝土减速及等速蠕变两个阶段的粘弹特性,在低温和高应力条件下表现出更强的温度依赖性和敏感性.研究成果为水工沥青混凝土的工程应用提供数值计算依据.

In order to study the viscoelastic properties of hydraulic asphalt concrete under low temperature and high stress,compression creep experiments of materials under different temperatures and stresses are carried out.Firstly,four kinds of viscoelastic constitutive models are selected to develop a nonlinear fitting program.Secondly,an optimal model is obtained by fitting model equation and experimental curve and analysing different models of advantages and disadvantages.Finally,the relationship between the optimal model parameters and the different temperatures and loading stress is studied.The results show that the Burgers model can well reflect the viscoelastic properties of hydraulic asphalt concrete in the two stages of primary and steady creep,which can display the characteristics of stronger temperature dependence and sensitivity.The research results provide a basis for the engineering application of hydraulic asphalt concrete.