重载交通沥青混凝土路面结构的耐久性分析

发布时间：2018-07-09 16:14

本文选题：耐久性 + 重载交通　；参考：《郑州大学》2014年硕士论文

【摘要】：半刚性基层沥青混凝土路面是我国公路的主要结构型式之一。平顶山市作为一个新兴的资源城市，重载车辆较多。由于受多方面因素制约，我国干线公路的设计标准相对较低，在重载车辆荷载长期作用下，半刚性基层沥青混凝土路面结构在其内部容易出现损伤，导致刚度降低，从而使得半刚性基层沥青混凝土路面的早期开裂破坏严重，影响其使用寿命。因此，开展半刚性基层沥青混凝土路面结构耐久性研究具有重要的实际应用价值。本文针对平顶山市干线公路的实际情况，基于损伤力学分析理论，利用半刚性材料与混凝土材料相似的特性，确定了二灰稳定砂和水泥稳定碎石等半刚性基层材料的塑性损伤模型。结合路况调查，确定了重载车辆的代表性轴载。在此基础上，利用有限元软件ABAQUS建立了路面结构的计算分析模型，对使用不同基层材料的半刚性基层沥青混凝土路面结构进行了系统的损伤计算分析。根据半刚性基层材料的损伤结果确定基层模量的折减情况，分析了不同基层材料对路面结构使用寿命的影响，并分别探讨了面层、基层及底基层的厚度对路面结构使用寿命的影响，提出了适合重载交通的干线公路半刚性基层沥青路面典型结构型式。为了分析温度变化对路面结构使用寿命的影响，对沥青混凝土路面结构的温度场进行数值模拟，计算了不同温度变化情况下路面结构的温度应力，分析了在重载作用、温度作用以及温度与荷载耦合作用下半刚性基层沥青混凝土路面结构的使用寿命，并研究了基层裂缝对路面结构使用性能的影响。为了提高半刚性沥青混凝土路面结构的耐久性能，结合国标《公路沥青路面设计规范》（JTG D50-2006）、河南省地方标准《公路水泥稳定碎石抗裂设计与施工技术规范》（DB41/T864-2013）、《河南省高速公路设计技术要求》和江苏省地方标准《江苏省高速公路沥青路面施工技术规范》（DB32/T1087-2008），对半刚性基层沥青路面的下面层及基层、底基层，给出了一个比较合理的骨架密实型混合料的级配组成范围，，供施工参考。
[Abstract]:Semi-rigid asphalt concrete pavement is one of the main structural types of highway in China. Pingdingshan City as a new resource city, heavy-haul vehicles are more. Due to the restriction of many factors, the design standard of trunk highway in China is relatively low. Under the long-term action of heavy load, the asphalt concrete pavement structure with semi-rigid base is liable to damage in its interior, resulting in the reduction of stiffness. Thus, the early cracking of asphalt concrete pavement with semi-rigid base is serious and its service life is affected. Therefore, it is of great practical value to study the durability of asphalt concrete pavement structure with semi-rigid base. In this paper, according to the actual situation of the highway in Pingdingshan City, based on the theory of damage mechanics analysis, the characteristics of semi-rigid material and concrete material are similar to each other. The plastic damage model of semi-rigid base materials such as lime-fly ash stabilized sand and cement stabilized gravel was established. Combined with the investigation of road condition, the representative axle load of heavy duty vehicle is determined. On this basis, the calculation and analysis model of pavement structure is established by using finite element software Abaqus, and the damage of semi-rigid asphalt concrete pavement with different base materials is calculated and analyzed systematically. According to the damage results of semi-rigid base materials, the reduction of base modulus is determined, the influence of different base materials on the service life of pavement structure is analyzed, and the surface layer is discussed respectively. Based on the influence of the thickness of base and base on the service life of pavement structure, a typical structure type of asphalt pavement with semi-rigid base for trunk highway is put forward, which is suitable for heavy-duty traffic. In order to analyze the influence of temperature change on the service life of pavement structure, the temperature field of asphalt concrete pavement structure is numerically simulated, the temperature stress of pavement structure under different temperature changes is calculated, and the effect of heavy load is analyzed. Under the action of temperature and coupling of temperature and load, the service life of asphalt concrete pavement structure with semi-rigid base is studied, and the influence of base crack on the performance of pavement structure is studied. In order to improve the durability of semi-rigid asphalt concrete pavement, Combined with National Standard "Design Code for Highway Asphalt pavement" (JTG D50-2006), Local Standard of Henan Province < Design and Construction Technical Specification of Highway cement stabilized Macadam (DB41 / T864-2013), "Technical requirements of Highway Design in Henan Province" and Local Standard of Jiangsu Province < Jiangsu Province Technical Specification for Asphalt pavement Construction of Provincial Expressway. (DB32 / T1087-2008). A reasonable gradation range of skeleton dense mixture is given for construction reference.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.21

【参考文献】