沥青稳定碎石下面层性能及施工工艺研究
发布时间：2019-01-27 07:44
【摘要】：为了减少半刚性基层沥青路面反射裂缝,近年来国内一些省份在公路建设中开始使用柔性基层,由于沥青价格较高,柔性基层沥青路面建设费用与半刚性基层路面相比大幅上扬,且国内对于柔性基层沥青路面车辙问题研究不足,缺乏科学的技术规范。因此,柔性联结层和半刚性基层相结合的结构形式成为目前较为常见的结构组合型式。其上层为沥青稳定碎石柔性层、下层为半刚性基层,既具有半刚性基层强度高、承载能力大的优点,又可以发挥柔性层良好的抗变形和抗开裂能力,同时也降低了路面建设费用。我国对于沥青稳定碎石结构层的设计施工等方面的研究尚处于起步阶段,缺乏科学的技术标准和设计指南,相关研究中提出的设计指标及参数多针对工程所在地实际情况,适用性受到限制。目前对于沥青稳定碎石结构层的力学计算分析多采用传统层状体系理论,缺乏对大粒径混合料细观力学行为的研究。针对以上问题,本文以河南省济源至焦作高速公路路面工程为依托,对ATB-30沥青稳定碎石在下面层中的应用进行深入研究。分析马歇尔设计方法存在的局限性,确定ATB-30下面层的配合比设计方法,结合依托工程具体情况选择ATB-30混合料原材料,并进行配合比组成设计,确定ATB-30沥青稳定碎石混合料生产配合比,并对其路用性能进行检测。利用离散元方法(PFC2D)生成二维ATB-30下面层细观模型,在施加标准轴载作用下,追踪荷载作用位置处的接触力、颗粒位移。构建4cmAC-13上面层+6cmAC-20中面层+10cmATB-30下面层的路面结构,追踪施加标准轴载后路面结构的细观响应,从细观角度阐释颗粒间的相互作用以及各层路面结构承受荷载作用的机理。确定不同阶段ATB-30沥青稳定碎石混合料施工温度控制范围,提出了ATB-30沥青稳定碎石混合料的施工工艺及施工质量控制措施,为ATB-30沥青稳定碎石混合料的施工应用提供参考依据。
[Abstract]:In order to reduce the reflection crack of asphalt pavement with semi-rigid base, in recent years, some provinces in China began to use flexible base in highway construction, because of the high price of asphalt, Compared with semi-rigid base asphalt pavement, the construction cost of flexible base asphalt pavement is much higher, and the domestic research on rutting problem of flexible base asphalt pavement is insufficient, and lack of scientific technical specification. Therefore, the combination of flexible connecting layer and semi-rigid base is the most common structural combination at present. The upper layer is a flexible layer of asphalt stabilized macadam and the lower layer is a semi-rigid base. It not only has the advantages of high strength and large bearing capacity of semi-rigid base, but also can give play to the good anti-deformation and anti-cracking ability of the flexible layer. At the same time, it also reduces the cost of pavement construction. The research on the design and construction of asphalt stabilized macadam structure layer in our country is still in its infancy, lacking of scientific technical standard and design guide, and the design indexes and parameters put forward in the relevant research are mostly aimed at the actual situation of the project location. Applicability is limited. At present, the traditional theory of layered system is used to calculate and analyze the mechanics of asphalt stabilized macadam structure layer, and the research on the meso-mechanical behavior of large-size mixture is lacking. Based on the pavement engineering of Jiyuan-Jiaozuo Expressway in Henan Province, the application of ATB-30 asphalt stabilized macadam in the lower layer is studied in this paper. This paper analyzes the limitations of Marshall design method, determines the mix ratio design method of ATB-30 lower layer, selects the raw materials of ATB-30 mixture according to the specific conditions of engineering, and designs the composition of mix ratio. The mixture ratio of ATB-30 asphalt stabilized macadam mixture was determined and its road performance was tested. Discrete element method (PFC2D) is used to generate a two-dimensional ATB-30 mesoscopic model. The contact force and particle displacement at the position of the load are traced under the action of the standard axial load. The pavement structure of the 6cmAC-20 middle surface layer of 4cmAC-13 is constructed, and the micro-response of the pavement structure under the standard axle load is followed up. The interaction between particles and the mechanism of different pavement structures subjected to load are explained from the view of meso. The construction temperature control range of ATB-30 asphalt stabilized macadam mixture at different stages is determined, and the construction technology and construction quality control measures of ATB-30 asphalt stabilized macadam mixture are put forward. It provides a reference for the construction application of ATB-30 asphalt stabilized macadam mixture.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.2
本文编号：2416060
[Abstract]:In order to reduce the reflection crack of asphalt pavement with semi-rigid base, in recent years, some provinces in China began to use flexible base in highway construction, because of the high price of asphalt, Compared with semi-rigid base asphalt pavement, the construction cost of flexible base asphalt pavement is much higher, and the domestic research on rutting problem of flexible base asphalt pavement is insufficient, and lack of scientific technical specification. Therefore, the combination of flexible connecting layer and semi-rigid base is the most common structural combination at present. The upper layer is a flexible layer of asphalt stabilized macadam and the lower layer is a semi-rigid base. It not only has the advantages of high strength and large bearing capacity of semi-rigid base, but also can give play to the good anti-deformation and anti-cracking ability of the flexible layer. At the same time, it also reduces the cost of pavement construction. The research on the design and construction of asphalt stabilized macadam structure layer in our country is still in its infancy, lacking of scientific technical standard and design guide, and the design indexes and parameters put forward in the relevant research are mostly aimed at the actual situation of the project location. Applicability is limited. At present, the traditional theory of layered system is used to calculate and analyze the mechanics of asphalt stabilized macadam structure layer, and the research on the meso-mechanical behavior of large-size mixture is lacking. Based on the pavement engineering of Jiyuan-Jiaozuo Expressway in Henan Province, the application of ATB-30 asphalt stabilized macadam in the lower layer is studied in this paper. This paper analyzes the limitations of Marshall design method, determines the mix ratio design method of ATB-30 lower layer, selects the raw materials of ATB-30 mixture according to the specific conditions of engineering, and designs the composition of mix ratio. The mixture ratio of ATB-30 asphalt stabilized macadam mixture was determined and its road performance was tested. Discrete element method (PFC2D) is used to generate a two-dimensional ATB-30 mesoscopic model. The contact force and particle displacement at the position of the load are traced under the action of the standard axial load. The pavement structure of the 6cmAC-20 middle surface layer of 4cmAC-13 is constructed, and the micro-response of the pavement structure under the standard axle load is followed up. The interaction between particles and the mechanism of different pavement structures subjected to load are explained from the view of meso. The construction temperature control range of ATB-30 asphalt stabilized macadam mixture at different stages is determined, and the construction technology and construction quality control measures of ATB-30 asphalt stabilized macadam mixture are put forward. It provides a reference for the construction application of ATB-30 asphalt stabilized macadam mixture.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.2
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