考虑水稳碎石性能劣化的沥青路面变形

发布时间：2018-08-05 16:39

【摘要】：采用线性Drucker-Prager理想弹塑性模型和时间型指数蠕变速率方程,利用有限元分析软件ABAQUS,分析连续性周期荷载作用下,水泥稳定碎石基层性能劣化过程中荷载作用对层状沥青路面结构受力及变形的影响,并对车轮轴载对路面车辙的影响作了深入分析.结果表明:在沥青面层中非弹性应变最大值变化规律与基层模量下降没有表现出明显的关系;沥青面层变形占总变形的比例最大,中面层对车辙的影响最显著;基层性能劣化使路面抗变形能力显著下降,路面永久变形随着基层模量的下降呈强非线性增长;在基层性能劣化过程中,随着沥青面层永久变形值的增加,沥青层面在路面结构中所占比例逐渐下降;在路面投入使用初期,非弹性变形发展较快,限制重载车辆可以有效减少车辙,为路面车辙控制提供了一定的依据.
[Abstract]:The linear Drucker-Prager ideal elastoplastic model and time-type exponential creep rate equation are used to analyze the continuous periodic loads by using the finite element analysis software Abaqus. The influence of load on the stress and deformation of layered asphalt pavement during the deterioration process of cement stabilized macadam base is discussed, and the influence of wheel axle load on pavement rutting is also analyzed. The results show that there is no obvious relationship between the maximum value of non-elastic strain and the decrease of the base modulus in the asphalt surface layer, the deformation of the asphalt surface layer is the largest proportion of the total deformation, and the effect of the middle surface layer on the rutting is the most significant. The deterioration of the performance of the base causes a significant decrease in the anti-deformation ability of the pavement, and the permanent deformation of the pavement increases with the decrease of the modulus of the base, and in the course of the deterioration of the performance of the base, with the increase of the permanent deformation of the asphalt surface, The proportion of asphalt layer in pavement structure is decreasing gradually. In the initial stage of pavement application, inelastic deformation develops rapidly. Limiting heavy duty vehicles can effectively reduce rutting, which provides a certain basis for rutting control.
【作者单位】：浙江大学交通工程研究所;
【基金】：国家自然科学基金资助项目(51078331)
【分类号】：U416.217

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