路面动载响应模型研究

基于目前国内外路面设计方法多以静荷载为基础,这与实际路面经受的汽车荷载为动载这一事实不相符合。利用弹性动力学理论方法,借助大型有限元软件ABAQUS对动荷下柔性路面结构响应规律进行了计算分析。根据动荷载及路面结构本身特点,重点考虑了模型尺寸、层间接触状态及土基特性等因素对路面动载响应的影响。结果表明:对于较大的模型尺寸,采用无限单元方法是一种省时省力的解决办法;层间接触特别是面层与基层之间的接触状况对路面结构的变形与受力状态有很大的影响;而邓肯张模型与线弹性模型相比两者在响应恢复阶段有较明显差异。

Study on Dynamic Response Model of Pavement

At present, the method of the pavement design is based on static load which is not in accord with the actual travelling load. Here, the elastic dynamics theory is used as theory foundation and the dynamic response of flexible pavement is gained with the help of the FEM software ABAQUS. According to the characteristics of dynamic load and road structure, the influence of the model size, contact status between layers and soil property, etc. on pavement response is computed. The result shows that infinite element is a good method for saving time to solve large size model problem; contact status especially between surface layer and base layer has a great influence on the working state of pavement structure; Using Duncan-Chang model and the linear elascit model respectively, the corresponding responses in the reversion phase are obviously different.