考虑颗粒相互作用的沥青混合料细观力学模型
本文选题:道路工程 + 沥青混合料 ; 参考:《长安大学》2016年硕士论文
【摘要】:沥青混合料是一种由沥青结合料、集料、沥青/集料界面相、微裂纹和空隙组成的多相非均匀复合材料,其力学性能极大依赖于材料复杂的内部结构,而这又由组分材料的性能、形状、尺寸及组成比例所决定。传统的沥青混合料力学性能及损坏机理分析方法主要包括连续介质力学理论与宏观试验方法,这种宏观尺度的分析方法不能揭示沥青混合料细观非均匀性引起的损伤机制,如材料内部微裂纹的滋生与扩展,材料非均匀性导致的微损伤以及应力集中引起的局部破坏。构建基于细观尺度的沥青混合料细观力学模型,可建立材料宏观路用性能与细观结构参数的定量关系,对沥青路面材料多尺度分析与精细化设计具有重要意义。本文为建立精确适用沥青混合料的细观力学模型,首先,综述了沥青混合料细观力学模型研究进展,并从力学理论和具体应用两个角度,将沥青混合料细观力学模型构建中的关键难题,凝练为对颗粒效应、尺寸效应、界面效应和粘弹效应四个基本力学问题的求解,为进一步研究提供指导。其次,选取5种研究常用细观力学模型,开展了多模型、多尺度、全频域沥青混合料有效动态模量预测的适用性验证,并分析得出考虑颗粒相互作用对构建沥青混合料细观力学模型重要性。再次,通过引入表征颗粒整体作用强弱的参数?,对考虑颗粒相互作用的细观力学J-C模型进行了简化,并基于弹性粘弹性对应原理,给出了预测沥青胶浆有效复数剪切模量的细观力学模型。最后,提出了两种描述沥青混合料细观结构特性的径向分布假设,均匀分布和P-Y分布,推导了细观力学J-C模型在两种假设分布下的有效模量精确预测公式。通过假设沥青混合料为以沥青砂浆为基体相,粗集料和空隙为夹杂相的多相复合材料,采用分步添加思想和弹性粘弹性对应原理,建立了考虑颗粒相互作用的沥青混合料动态模量两步预测方法。结果表明,相比于已有研究,本文提出的考虑颗粒相互作用的细观力学模型对沥青胶浆和沥青混合料有效粘弹性能预测具有更高预测精度。本文考虑颗粒相互作用的模型,为建立多解耦合、精确适用沥青混合料的细观力学模型奠定基础。
[Abstract]:Asphalt mixture is a multiphase heterogeneous composite material consisting of asphalt binder, aggregate, asphalt / aggregate interface phase, micro crack and void. Its mechanical properties depend greatly on the complex internal structure of the material, which is determined by the performance, shape, size and composition of the component materials. The mechanical properties of the traditional asphalt mixture. The analysis methods of damage mechanism mainly include the continuous medium mechanics theory and the macro test method. This macro scale analysis method can not reveal the damage mechanism caused by the meso heterogeneity of asphalt mixture, such as the propagation and propagation of the micro cracks in the material, the micro damage caused by the material inhomogeneity and the local breakage caused by the stress concentration. The meso mechanical model of asphalt mixture based on the meso scale is constructed, and the quantitative relationship between the properties of the material and the parameters of the microstructure can be established. It is of great significance to the multi-scale analysis and fine design of asphalt pavement material. This paper is to establish a meso mechanical model for the precise application of asphalt mixture. First, the asphalt mixture is summarized. The research progress of the meso mechanical model is made. From two angles of mechanics theory and concrete application, the key problem in the construction of the meso mechanical model of asphalt mixture is to be solved to solve four basic mechanical problems, such as particle effect, size effect, interface effect and viscoelastic effect, and provide guidance for further research. Secondly, 5 kinds of research are selected. In common use of mesoscopic mechanics model, the applicability of multi model, multi scale, full frequency domain asphalt mixture effective dynamic modulus prediction is carried out, and the importance of considering particle interaction to construct the meso mechanical model of asphalt mixture is analyzed. Again, by introducing the parameters that characterize the strength of the particles as a whole, the interaction of particles is considered. The mesoscopic mechanical J-C model is simplified, and based on the elastic viscoelastic correspondence principle, a meso mechanical model for predicting the effective complex shear modulus of asphalt mortar is given. Finally, two kinds of radial distribution hypothesis, uniform distribution and P-Y distribution are proposed to describe the microstructure characteristics of asphalt mixture, and two kinds of meso mechanical J-C models are derived. A two step prediction method of dynamic modulus of asphalt mixture with particle interaction is established by assuming that asphalt mixture is a multi-phase composite material with bituminous mortar as matrix phase, coarse aggregate and void phase, by assuming the step addition idea and elastic viscoelastic correspondence principle. The results show that the meso mechanical model proposed in this paper has a higher prediction accuracy for the prediction of effective viscoelastic properties of asphalt mixture and asphalt mixture compared with the existing research. This paper considers the model of particle interaction, which lays the foundation for establishing multi solution coupling and accurately applying the meso mechanical model of asphalt mixture.
【学位授予单位】:长安大学
【学位级别】:硕士
【学位授予年份】:2016
【分类号】:U414
【参考文献】
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