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为了合理地预估沥青路面的车辙,建立了一个新的非线性粘弹-弹塑性本构模型.此模型是由广义的Maxwell模型串联一个弹塑性模型而组成.然后,从蠕变的角度详细推导了广义的Maxwell模型的线性和非线性的粘弹性本构方程.采用非线性有限元法对4种沥青混合料的车辙深度进行了计算,并与SHRP的有限元结果以及SWK/UN的实验结果进行了比较,说明所建立的非线性粘弹-弹塑性本构模型是有效的.此模型可以体现沥青混凝土材料的非线性弹性、塑性、粘弹性、非线性粘弹性对沥青路面车辙的影响,较为全面地反映沥青路面永久变形的特性.
In order to reasonably predict the rutting of asphalt pavement, a new nonlinear viscoelastic-elastoplastic constitutive model is established, which is composed of a generalized Maxwell model connected in series with an elastoplastic model. Then, the creep angle The linear and nonlinear viscoelastic constitutive equations of generalized Maxwell model are deduced.The rutting depths of four kinds of asphalt mixture are calculated by nonlinear finite element method and are compared with the experimental results of SHRP and SWK / UN The results show that the established nonlinear viscoelastic-elastoplastic constitutive model is effective.The model can reflect the influence of nonlinear elasticity, plasticity, viscoelasticity and nonlinear viscoelasticity of asphalt concrete on the rutting of asphalt pavement , A more comprehensive reflection of the permanent deformation of asphalt pavement characteristics.