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为了研究路面厚度、模量、加载速度等因素对FWD作用下沥青路面动力特性的影响,该文基于有限元原理建立沥青路面动力特性模型,并通过与实测数据进行对比分析验证所建模型的精度,最后对FWD作用下的沥青路面弯沉及应力等动力特性及路面厚度、模量、加载速度对其动力特性的影响进行了研究,重点研究了不同结构层厚度及加载速度下面层、基层和底基层各自的应力变化情况以及路面弯沉变化趋势。研究表明:结构层厚度、设计参数(模量等)、加载速度等因素的变化对沥青路面动力特性均存在不同程度的影响,研究结果有助于根据路面结构的应力及变形特点进行路基路面结构设计,同时对分析路面损坏的原因及采取何种预防措施提供参考及依据。
In order to study the influence of pavement thickness, modulus and loading speed on the dynamic characteristics of asphalt pavement under the action of FWD, a dynamic model of asphalt pavement is established based on the finite element method. The accuracy of the model is verified by comparison with measured data Finally, the influence of FWD on the dynamic characteristics of asphalt pavement deflection and stress, as well as the influence of the pavement thickness, modulus and loading speed on the dynamic characteristics of asphalt pavement were studied. The influences of the thickness of the structure layer and the loading speed on the dynamic behaviors of the subsurface, Sub-grass-roots changes in their respective stress and the trend of deflection of the road. The results show that the dynamic characteristics of asphalt pavement are affected to varying degrees by the changes of structural layer thickness, design parameters (modulus, etc.) and loading speed. The results of this study contribute to the subgrade and pavement structure according to the stress and deformation characteristics of pavement structure Design, at the same time to analyze the reasons for pavement damage and take precautions to provide reference and basis.