【作者】 刘伟；

【导师】 王秉纲；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2015， 博士

【摘要】 长期以来,我国高速公路的路面结构相对单一,主要为半刚性基层沥青路面结构,这种单一的路面结构形式很难适应全国范围内各个地区的使用要求。柔性基层沥青路面结构的应用不仅可以丰富我国沥青路面的结构形式,对于提高我国高速公路的耐久性和服务水平也有重要的意义。本文对沪宁高速公路柔性基层沥青路面路段近10年的路面各项性能观测数据进行了分析,积累了大量的观测数据,包括路面结构性能观测、路面病害和车辙状况现场调查等,对比柔性基层路面与半刚性基层路面的性能差异,评价柔性基层路面对我国交通、气候条件的适应性,对全厚式柔性基层路面结构的典型病害进行分析。通过芯样的厚度、空隙率、级配、油石比、沥青性能等指标的测试,研究柔性基层沥青路面车辙产生的原因、层位组成、发展情况。通过对沪宁高速无锡段路面结构所采用的沥青混合料进行动态模量主曲线研究,并基于动态模量对柔性基层沥青路面结构进行力学分析,分析交通轴载对柔性基层沥青路面结构耐久性的影响,同时为进一步开展性能预估研究提供基础。基于对无锡段柔性基层结构的持续性能观测数据,对柔性基层沥青路面进行疲劳、车辙的性能预估研究,并通过数理统计方法,采用无锡段宁沪方向和沪宁方向的柔性基层路面实测车辙,对MEPDG车辙预估模型进行了修正和验证,得到了地区修正系数和修正后的车辙预估模型。更多还原

【Abstract】 For a long time, pavement structure of highway in China is relatively simple, which is semi-rigid base asphalt pavement structure, so that the single form of pavement structure is very difficult to adapt to the requirements from different areas in the country. The application of flexible base asphalt pavement enrich the structural forms of asphalt pavement and is also important for improving the durability and service level of China’s highway network.In this paper, a large number of the observed data ofthe flexible base asphalt pavement sections constructed during the last 9 years were collected and analyzed, including performance observation,field survey on pavement distress and rutting situation. This study compared flexible pavement and semi-rigid road surface performance and evaluated the adaptability of flexible base asphalt road to transportation and climate conditions. At last, the typical diseases of asphalt pavement with flexible base structure were analyzed. Based on the core sample thickness, porosity, gradation, bitumen aggregate ratio, asphalt performance index of the test,the reason of flexible base asphalt pavement rutting and layer composition and development of the situation were investigated. Master curves of dynamic moduluswere made for the asphalt mixture from Wuxi section of Huning Expressway. Based on the dynamic modulus mechanical analysis of flexible base asphalt pavement structure was conducted, effect of traffic axle load onflexible base asphalt pavement structure durability was analyzed. At mean time, this study provided fundamental data for further performance prediction. Based on continuous observation datafrom the flexible base structure in Wuxi section, the fatigue and rutting performanceof flexible base asphalt pavement of were predicted. By using the mathematical statistics method and the measured the rutting data of flexible pavement in the Wuxi section in both Nanjing to Shanghai direction and Shanghai to Nanjing direction, the MEPDG rutting prediction model was modified and verified. Finally, the revised coefficients for local area and the rutting prediction model were obtained.更多还原