半刚性基层沥青路面变形的粘弹塑性分析

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响应的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。

Analysis of Visco-Elastoplastic Deformation of Asphalt Pavement with Semi-Rigid Base Course

Asphalt pavement with semi rigid base course is a multi layer structure consisting of visco elastoplastic materials of asphalt mixtures and elasto viscoplastic materials of base course and subgrade. The deformations due to repeated loadings in the asphalt layer can be simulated by the visco elastoplastic models. Besides other advantages, these models are ready to be coupled with elasto viscoplastic models so that the responses of the pavement system to the loading under various working conditions can be investigated. Comparing them with the classical methods of elastic analyses, elasto viscoplastic methodsdescribed in this paper can be employed to obtain permanent deformations as well as deflections and stress distributions within the pavements. Case studies show that thickness and stiffness of the base course are two important and intricate factors that influence pavement performance.