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将沥青混合料假设为粘弹性体,应用沥青混合料的蠕变试验结果,拟合蠕变应变公式,建立粘弹性本构关系。将单圆均布荷载作用下的饱水沥青路面简化为空间轴对称问题,建立二维的有限元模型。应用有限元软件进行求解,并对计算结果进行详细地分析,得出以下结论:在行车荷载作用后,路面表面的竖向位移没有完全恢复,产生了竖向永久变形;由于沥青面层(粘弹性体)的应变恢复的速度小于基层(弹性体)的应变恢复速度,导致了路面结构中存在残余应力;在沥青面层(粘弹性体)的应变中,弹性应变部分完全恢复,蠕变应变部分没有完全恢复,大部分的不可恢复的蠕变应变残留在沥青面层中。
The asphalt mixture is assumed to be a viscoelastic body. The creep test results of asphalt mixture are used to fit the creep strain formula and establish the viscoelastic constitutive relation. The single-circular uniform loading of saturated asphalt pavement is simplified as a spatial axisymmetric problem, the establishment of two-dimensional finite element model. Finite element software is used to solve the problem and the calculation results are analyzed in detail. The conclusions are drawn as follows: After the driving load, the vertical displacement of the pavement surface is not completely restored, resulting in vertical permanent deformation. As the asphalt surface layer Elastic body) is less than the strain recovery rate of the base (elastomer), resulting in the existence of residual stress in the pavement structure; in the asphalt surface layer (viscoelastic) strain, the elastic strain partially recovered, the creep strain Part of the incomplete recovery, most of the irreversible creep strain remain in the asphalt surface layer.