沥青路面车辙行为仿真与预测
发布时间：2018-12-22 08:21
【摘要】：沥青路面辙损害现象越来越突出,车辙共有三种类型,其中失稳型车辙最为普遍,危害也最大。车辙病害严影响路面使用寿命、行车的安全性和舒适性,如何预测车辙变形的发展以及防治车辙病害已经成为道路工程界迫切解决的热点关键问题。论文基于路面力学弹性层状理论体系,建立了沥青路面3D有限元模型,开展静态路面结构的响应分析,依据力学分析成果,提出抗车辙沥青混合料的最佳结构组合设计;深入分析了沥青路面材料模量、结构层厚度以及轴重变化对路面结构力学响应的影响作用,同时结合抗车辙沥青混凝土,从工程技术与经济角度分析给出了合理的弹性模量取值范围。之后基于有限元非线性理论模型,结合沥青混合料的粘弹特点,提出合理的材料模型,利用Ansys通用有限元软件构建沥青路面车辙数值分析模型;通过单轴蠕变试验,得到贝雷-诺顿蠕变模型参数,成功开展沥青路面车辙有限元的仿真分析,提出车辙发展回归公式。最后,针对我国沥青路面结构特点以及现有沥青路面设计体现存在的不足,提出增加容许剪切应力和容许辙槽深度两个指标作为现有设计方法的补充设计指标。
[Abstract]:The rutting damage of asphalt pavement is more and more prominent. There are three types of ruts, among which unstable ruts are the most common and most harmful. Rutting disease severely affects pavement service life, driving safety and comfort. How to predict the development of rutting deformation and how to prevent rutting disease have become a hot topic in road engineering field. Based on the elastic layer theory system of pavement mechanics, the 3D finite element model of asphalt pavement is established, and the response analysis of static pavement structure is carried out. According to the results of mechanical analysis, the optimum structural combination design of anti-rutting asphalt mixture is put forward. The influence of the material modulus of asphalt pavement, the thickness of structure layer and axle load on the mechanical response of pavement structure is deeply analyzed. At the same time, the anti-rutting asphalt concrete is combined. From the point of view of engineering technology and economy, the reasonable range of elastic modulus is given. Then, based on the nonlinear theory model of finite element and the viscoelastic characteristics of asphalt mixture, a reasonable material model is put forward, and a numerical analysis model of asphalt pavement rutting is constructed by using Ansys software. Through uniaxial creep test, the parameters of Berey-Norton creep model are obtained, and the finite element simulation analysis of asphalt pavement rutting is carried out successfully, and the regression formula of rutting development is put forward. Finally, in view of the structural characteristics of asphalt pavement in China and the shortcomings of the existing asphalt pavement design, two indexes of increasing allowable shear stress and allowable rutting depth are proposed as supplementary design indexes of the existing design methods.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217;U418.68
本文编号：2389559
[Abstract]:The rutting damage of asphalt pavement is more and more prominent. There are three types of ruts, among which unstable ruts are the most common and most harmful. Rutting disease severely affects pavement service life, driving safety and comfort. How to predict the development of rutting deformation and how to prevent rutting disease have become a hot topic in road engineering field. Based on the elastic layer theory system of pavement mechanics, the 3D finite element model of asphalt pavement is established, and the response analysis of static pavement structure is carried out. According to the results of mechanical analysis, the optimum structural combination design of anti-rutting asphalt mixture is put forward. The influence of the material modulus of asphalt pavement, the thickness of structure layer and axle load on the mechanical response of pavement structure is deeply analyzed. At the same time, the anti-rutting asphalt concrete is combined. From the point of view of engineering technology and economy, the reasonable range of elastic modulus is given. Then, based on the nonlinear theory model of finite element and the viscoelastic characteristics of asphalt mixture, a reasonable material model is put forward, and a numerical analysis model of asphalt pavement rutting is constructed by using Ansys software. Through uniaxial creep test, the parameters of Berey-Norton creep model are obtained, and the finite element simulation analysis of asphalt pavement rutting is carried out successfully, and the regression formula of rutting development is put forward. Finally, in view of the structural characteristics of asphalt pavement in China and the shortcomings of the existing asphalt pavement design, two indexes of increasing allowable shear stress and allowable rutting depth are proposed as supplementary design indexes of the existing design methods.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217;U418.68
【参考文献】
相关硕士学位论文 前1条
1 许银行;陡坡路段SMA沥青混合料研究[D];长安大学;2006年
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