横观各向同性路面结构力学行为研究

发布时间：2018-05-14 11:05

本文选题：横观各向同性 + 水平荷载　；参考：《湖南大学》2014年硕士论文

【摘要】：路基路面材料由于其材料结构组成、成型等原因,导致了路基路面材料具有明显的各向异性特征,且在荷载作用下的路面结构各层次的力学行为不一样。横观各向同性作为一种特殊的各向异性表征,能较好的表征路面结构材料的各向异性导致的路面结构行为差异。本文在国家自然科学基金项目“各向异性路面结构力学行为及其参数智能反演研究”(项目批准号：51278188)资助下,基于路面材料的横观各向同性,运用有限元数值分析方法,分析了不同荷载作用情况下路面结构各层次的力学行为。主要从以下几个方面研究： (1)建立横观各向同性路面结构三维有限元模型,研究了竖向荷载作用下横观各向同性基层和土路基沥青路面结构力学行为的影响规律；考虑水平荷载作用,得到了横观各向同性基层沥青路面结构力学行为规律；考虑基层的横观各向同性,对比分析横观各向同性对路面预估服务寿命的影响,发现现行规范偏危险。 (2)进一步考虑荷载的非均匀分布,建立非均布荷载模型,研究了非均布荷载作用下横观各向同性面层和基层沥青路面结构力学行为规律,发现非均布荷载作用下材料的各向异性特性更为显著。 (3)建立横观各向同性路面结构三维动力学有限元模型,分别讨论了FWD荷载作用下横观各向同性面层、基层和土路基沥青路面结构动力响应,得到了路基路面材料的横观各向同性对路面结构力学行为的影响规律。
[Abstract]:The subgrade and pavement material, because of its material structure, forming and so on, leads to the obvious anisotropic characteristics of the subgrade and pavement material, and the mechanical behavior of the pavement structure at all levels under the load is different. The transverse isotropy, as a special anisotropic surface, can better characterize the anisotropy of the pavement structure material. Differences in pavement structure behavior caused by sex.
In this paper, under the support of the National Natural Science Fund Project "structural mechanical behavior of anisotropic pavement and intelligent inversion of parameters" (project approval number: 51278188), based on the transverse isotropy of pavement material, the mechanical behavior of various layers of pavement structure under different loading conditions is analyzed by the finite element numerical analysis method. The following aspects should be studied.
(1) establish the three-dimensional finite element model of transversely isotropic pavement structure, study the influence law of the mechanical behavior of the transverse isotropic base and the asphalt pavement under the vertical load, and take the horizontal load into consideration, get the mechanical behavior law of the transverse isotropic asphalt pavement structure, and consider the transverse anisotropy of the base. The influence of transversely isotropy on pavement prediction service life is compared and analyzed. It is found that the existing codes are dangerous.
(2) to further consider the non uniform distribution of load, establish an uneven distribution load model, study the mechanical behavior of the transverse isotropic surface layer and the base asphalt pavement under the action of uneven distribution, and find that the anisotropic properties of the material under uneven distribution load are more significant.
(3) the three-dimensional dynamic finite element model of the transversely isotropic pavement structure is established. The dynamic response of the transverse isotropic surface layer and the asphalt pavement structure of the subgrade and soil subgrade under the action of FWD load is discussed respectively. The effect of the transversely isotropy of the subgrade and pavement material on the force behavior of the pavement structure is obtained.

【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.2

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