沥青路面永久变形的非线性粘弹-弹塑性本构模型

Nonlinear viscoelastic-elastoplastic constitutive model of permanent deformation for asphalt pavement

为了正确预估沥青路面的永久变形,对沥青路面永久变形的非线性粘弹性有限元法进行了研究,推导了广义Maxwell模型的非线性粘弹性有限元法,建立了沥青路面永久变形的非线性粘弹-弹塑性本构模型,从弹性、非线性弹性、塑性、粘弹性、非线性粘弹性等方面对沥青路面的永久变形进行了分析,对沥青路面的永久变形进行了计算,并将计算结果和SHRP的计算结果以及SWK/UN轮辙试验结果进行了对比。计算结果表明:沥青路面永久变形的非线性粘弹-弹塑性本构模型是有效的,其路面变形计算值与SHRP的计算值相对误差为6.567%,与SWK/UN轮辙试验值相对误差为6.069%。

In order to correctly predict the permanent deformation of asphalt pavement, nonlinear viscoelastic finite element method was studied, the finite element method of nonlinear viscoelas- ticity for generalized Maxwell model was deduced, a nonlinear viscoelastic-elastoplastic constitu-tive model of permanent deformation for asphalt pavementhen was set up, and the permanent de-formation of asphalt pavement was analyzed depending on its material properties, such as elasticity, nonlinear elasticity, plasticity, viscoelasticity and nonlinear viscoelasticity, etc. , the permanent deformation of asphalt pavement was simulated by using the model, SHRP and SWK/UN experiment, and the numerical results were compared. Comparison result shows that their relative error are 6. 567% and 6. 069% respectively, the model is effective. 6 tabs, 10 figs, 16 refs.