沥青混凝土路面动力特性数值模拟研究

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.

A Study on Numerical Simulation of Asphalt Concrete Pavement Dynamic Characteristics

To study the influence of pavement thickness,modulus,loading speed and other factors on the asphalt concrete pavement under FWD dynamic behavior,the model is established based on the principle of finite element,then model accuracy is verified through comparative analysis with the measured data,the deflection and stress and other dynamic properties of the asphalt concrete pavement under FWD and the influences of surface thickness,modulus,loading speed on dynamic behavior are studied,focusing on the changing trend of stress and road deflection of below layer,primary and sub-base on the condition of different structure thickness and loading rate.Studies show that: the dynamic properties of asphalt concrete pavement is influenced by the change of the thickness of the structure,design parameters(modulus,etc.),loading speed and other factors,the findings contribute to pavement structural optimal design and damage analysis.