高等级公路贫混凝土基层沥青路面研究

发布时间：2018-02-11 02:11

本文关键词： 高等级公路沥青路面贫混凝土基层橡胶沥青防裂夹层超载合理结构　出处：《烟台大学》2014年硕士论文　论文类型：学位论文

【摘要】：贫混凝土基层沥青路面兼备沥青混凝土和水泥混凝土两者的优点，刚柔相济，承载力高，能较好适应目前大流量交通和重载交通的发展趋势，因此越来越多的应用到了高速公路路面结构中。为了发展和推广新的路面形式，进行贫混凝土基层沥青路面结构的研究，，具有十分重要的现实意义和广阔的应用前景。本文的研究主要针对于高等级公路的贫混凝土基层沥青路面。首先，分析了贫混凝土基层材料的力学特性，通过分析贫混凝土基层沥青路面的主要破坏形式，提出对这种结构的特性的评价指标，即：沥青面层层底拉应力、拉应变，贫混凝土基层层底拉应力，底基层层底拉应力，路表弯沉，面层剪应力、剪应变与路基顶面压应变八个力学指标，并得出沿路面结构深度的各力学指标的最不利计算位置。其次，选取面层模量和厚度、基层模量和厚度、底基层模量和厚度、路基模量和轴载等12个因素，通过正交分析法得出了每个因素对各力学指标影响程度的顺序。再次，对贫混凝土基层厚度和模量、沥青面层厚度和模量、水泥稳定碎石底基层厚度以及轴载对路面结构各力学指标的影响进行了详尽的计算分析，得出各自的影响规律。通过对贫混凝土基层沥青路面缺陷的分析，推荐设置橡胶沥青防裂夹层做为改善措施。运用通用有限元软件ABAQUS分析了设置防裂夹层对贫混凝土基层沥青路面结构应力的影响规律，为结构设计提供了重要依据。最后，通过分析研究，提出了适合于高等级公路的贫混凝土基层沥青路面的合理结构，并分析了超载率为30%和50%情况下所需要的贫混凝土基层沥青路面的结构厚度。总结了贫混凝土基层材料以及防裂夹层材料的生产和施工的具体要求。
[Abstract]:The bituminous pavement with poor concrete base has the advantages of both asphalt concrete and cement concrete. It can adapt to the development trend of heavy traffic and heavy load traffic. Therefore, more and more applications have been made to highway pavement structure. In order to develop and popularize new pavement form, the research on asphalt pavement structure of lean concrete base is carried out. It has very important practical significance and broad application prospect. The research of this paper is mainly aimed at the asphalt pavement of poor concrete base course of high grade highway. First of all, the mechanical properties of poor concrete base material are analyzed. Through analyzing the main failure forms of asphalt pavement of lean concrete base, the evaluation index of this kind of structure is put forward, that is, the tensile stress and strain of asphalt surface layer. Eight mechanical indexes of poor concrete base layer, such as tensile stress, bottom tensile stress, road surface deflection, shear stress, shear strain and compressive strain at the top of the roadbed, are obtained, and the most unfavorable calculating position of each mechanical index along the depth of the pavement structure is obtained. Secondly, 12 factors, such as surface modulus and thickness, base modulus and thickness, base base modulus and thickness, subgrade modulus and axial load, are selected, and the order of each factor influencing each mechanical index is obtained by orthogonal analysis. Thirdly, the influences of the thickness and modulus of lean concrete base, the thickness and modulus of asphalt surface, the thickness of cement stabilized macadam base and the axial load on the mechanical indexes of pavement structure are calculated and analyzed in detail. Through the analysis of asphalt pavement defects of lean concrete base, Rubber asphalt anti-cracking interlayer is recommended as the improvement measure. The influence of anti-crack interlayer on the structural stress of asphalt pavement with lean concrete base is analyzed by using the general finite element software ABAQUS, which provides an important basis for structural design. Finally, through the analysis and research, the reasonable structure of the asphalt pavement of lean concrete base is put forward, which is suitable for the high grade highway. The structural thickness of lean concrete base asphalt pavement is analyzed when the overload ratio is 30% and 50%. The concrete requirements of production and construction of lean concrete base material and crack proof sandwich material are summarized.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217

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