耦合荷载下长寿命复合式路面力学响应与结构组合分析

发布时间：2018-05-01 15:01

本文选题：长寿命复合式市政路面 + 功能梯度匹配　；参考：《武汉理工大学》2014年硕士论文

【摘要】：半刚性沥青路面是中国城市主干道的主要路面结构形式，但其往往工程完成不久就出现各种病害甚至严重破损，安全运营服役周期普遍小于设计寿命，因此亟待发展新型长寿命复合式路面。本文基于国际长寿命路面设计理念和功能梯度匹配原理，提出了一种新型长寿命复合式路面，将高性能冷拌水泥-乳化沥青混凝土路面应用于高压应力区（联结层），并设置大粒径沥青碎石与水泥稳定碎石复合式基层，可有效减小现有半刚性沥青路面的结构性破坏与功能性失效问题，实现路面安全营运的长寿命服役周期。本文对现有沥青路面的结构分析方法——弹性层状体系理论及有限元数值分析方法进行了综合比较，认为三维有限元模型能更好的表征荷载作用下的路面结构力学状态。研究并提出了长寿命复合式路面的刚度储备及强度储备设计控制指标，初步探讨了长寿命复合式路面的功能性和技术经济设计模型及流程。本文建立三维有限元模型，施加BZZ100标准车辆荷载，分析路面材料宏观力学参数（弹性模量）与各层结构厚度对长寿命复合式市政路面的影响，并将长寿命市政路面的设计理论与实际情况相结合，提出了宜昌长寿命复合式市政路面材料及结构厚度组合，结果分析表明新型长寿命路面结构优于相对应的常规半刚性沥青路面结构。进一步耦合车辆荷载及三维温度荷载对长寿命复合式市政路面进行分析，研究得到新型路面结构的夏季代表性温度场变化曲线，并对车辆-温度耦合应力场对长寿命复合式市政路面的影响进行了详尽的分析。考虑了超载、坡度等复杂情况对长寿命复合式市政路面的影响。本文在长寿命复合式市政路面宏观力学分析的基础上，选取该路面结构关键材料—水泥乳化沥青混凝土，分析其细观力学尺度的材料影响机理，并比较其宏观—细观尺度应力（应变）场分布规律及破坏机理，，结果表明水泥乳化沥青混凝土细观结构受力与破坏形式与宏观尺度并不相同，在宏观分析基础上进行路面材料细观分析能更深入地了解路面结构局部应力（应变）分布规律并促进路面材料的合理设计。
[Abstract]:Semi-rigid asphalt pavement is the main pavement structure form of the main road in Chinese cities, but it often appears a variety of diseases or even serious damage shortly after the completion of the project, and the service cycle of safe operation is generally smaller than the design life. Therefore, it is urgent to develop a new type of long life composite pavement. Based on the international concept of long life pavement design and the principle of functional gradient matching, a new type of long life composite pavement is proposed in this paper. The high performance cold mix cement emulsified asphalt concrete pavement is applied to the high pressure stress zone and the composite base course of large size asphalt macadam and cement stabilized macadam is set up. It can effectively reduce the structural failure and functional failure of the existing semi-rigid asphalt pavement, and realize the long life service cycle of road safety operation. In this paper, the existing structural analysis methods of asphalt pavement, elastic layered system theory and finite element numerical analysis method, are comprehensively compared. It is concluded that the three-dimensional finite element model can better represent the mechanical state of pavement structure under load. The stiffness reserve and strength reserve design control index of long life composite pavement is studied and the design model and flow chart of function and technology economy of long life composite pavement are discussed preliminarily. In this paper, a three-dimensional finite element model is established, and BZZ100 standard vehicle load is applied to analyze the influence of macroscopic mechanical parameters (modulus of elasticity) of pavement material and the thickness of each layer structure on the long-life composite municipal pavement. Combining the design theory of long-life municipal pavement with the actual situation, the combination of material and structure thickness of Yichang long-life composite municipal pavement is put forward. The results show that the new long-life pavement structure is superior to the corresponding semi-rigid asphalt pavement structure. Further coupling the vehicle load with the three-dimensional temperature load to analyze the long-life composite municipal pavement, and obtain the representative temperature field curve of the new pavement structure in summer. The effect of vehicle-temperature coupling stress field on long life composite municipal pavement is analyzed in detail. The influence of complex conditions such as overload and slope on long-life composite municipal pavement is considered. On the basis of macromechanics analysis of long-life composite municipal pavement, this paper selects the key material of the pavement structure, cement emulsified asphalt concrete, and analyzes the material influence mechanism of its meso-mechanical scale. The stress (strain) field distribution and failure mechanism of cement emulsified asphalt concrete are compared. The results show that the stress and failure forms of cement emulsified asphalt concrete are different from those of macro scale. On the basis of macroscopic analysis, the distribution of local stress (strain) of pavement structure can be better understood and the reasonable design of pavement material can be promoted.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.2

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