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为了研究路面结构层厚度、模量、加载速度等因素对FWD作用下沥青混凝土路面动力特性的影响,基于有限元原理建立沥青混凝土路面动力特性模型,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作用下的沥青混凝土路面弯沉、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混凝土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,同时为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 structure layer thickness, modulus and loading speed on the dynamic characteristics of asphalt pavement under the action of FWD, the dynamic characteristics model of asphalt concrete pavement is established based on the finite element principle. The contrasted analysis with the measured data verifies the model Finally, the dynamic characteristics of asphalt pavement under flexural and stress conditions such as deflection and stress of FWD, as well as the influence of pavement thickness, modulus and loading speed on the dynamic characteristics of the pavement are studied. The effects of different thickness and loading speed , The grass-roots and sub-base their respective stress changes and changes in road surface deflection. The results show that: the structural layer thickness, design parameters (modulus, etc.), loading speed and other factors change the dynamic properties of asphalt concrete pavement have varying degrees of impact. The research results are helpful to the design of subgrade and pavement structure according to the stress and deformation characteristics of the pavement structure. At the same time, it provides reference and basis for analyzing the reason of pavement damage and the preventive measures.