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采用粘弹塑性模型模拟沥青路面面层材料的应力应变特性,建立典型沥青路面的粘弹塑性有限元模型,分析在循环荷载作用下沥青路面结构的变形特性,研究不同超载比例对路面的竖向位移和应变的影响。结果表明在循环荷载作用下,沥青路面不可恢复变形逐渐积累,路面车辙深度不断加大;随着荷载的增大,路表车辙深度也逐渐增大,超载比例越大,车辙增加速率也越大;随着荷载和作用时间的增加,蠕变应变和塑性应变逐渐增加,在高温环境下,塑性应变较蠕变应变要大。
The viscoelastic-plastic model was used to simulate the stress-strain behavior of asphalt pavement surface materials. The visco-elastoplastic finite element model of typical asphalt pavement was established. The deformation characteristics of asphalt pavement under cyclic loading were analyzed. Displacement and strain effects. The results show that under the cyclic loading, the unchangeable deformation of asphalt pavement gradually accumulates, and the rutting depth of the pavement increases. With the increase of load, the rutting depth of the road surface gradually increases. The greater the proportion of overloading is, the greater the rate of rutting increases The creep strain and plastic strain gradually increase with the increase of load and acting time. Under high temperature, the plastic strain is larger than the creep strain.