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半刚性基层沥青路面为粘弹塑性材料 (沥青混合料面层 )及弹性～粘塑性材料 (路基、土基 )组成的复合层状结构。由循环轮载引起的沥青混合料面层内的粘弹塑性变形 ,可由粘弹塑性模型加以模拟 ;同时该模型可与弹性～粘塑性模型统一于一个数值分析程序里 ,以模拟半刚性基层沥青路面在各种环境下的工作状况。与传统的层状弹性计算方法相比较 ,粘弹塑性分析既能反映路面结构对行车荷载大小的应力及变形响应 ,又能获得不同行车作用时间下路面的塑性变形。算例分析表明 ,半刚性基层的刚度及厚度是影响路面结构力学晌应的 2个重要而又复杂的因素 ,故设计中应对这 2项参数加以综合考虑
Semi-rigid base asphalt pavement is a composite lamellar structure composed of visco-elastic plastic material (asphalt mixture surface layer) and elastic-viscoplastic material (roadbed and earth foundation). The viscoelastic plastic deformation of the asphalt mixture surface layer caused by cyclic loading can be simulated by viscoelastic-plastic model. At the same time, the model can be integrated with the elastic-viscoplastic model in a numerical analysis program to simulate the semi-rigid base asphalt Road conditions in a variety of working conditions. Compared with the traditional layered elastic calculation method, the viscoelasto-plastic analysis can not only reflect the stress and deformation response of pavement structure to driving load, but also obtain the plastic deformation of pavement under different driving time. The case study shows that the stiffness and thickness of the semi-rigid base are two important and complex factors that affect the mechanical response of pavement structure. Therefore, these two parameters should be considered in the design