【摘要】 沥青混合料疲劳极限的存在是永久路面结构设计的主要理论依据,因此掌握沥青层底应变的分布和应变行为规律是永久路面设计的关键.通过现场实测数据,分析了永久路面试验路的交通组成、轴载谱及路面温度分布规律.通过轴载控制检测,分析了动态应变脉冲的特征,建立了最大纵向应变与温度、轴载的回归模型.根据轴载谱、温度分布及应变回归模型,对不同路面结构全年的最大应变分布进行了分析.根据疲劳极限理论,提出永久路面疲劳寿命的累积损伤分析法,并用累积损伤法对试验路的疲劳寿命进行了计算分析.更多还原

【Abstract】 Because the HMA fatigue limit is the theoretical base of perpetual pavement design, to grasp the strain distribution and strain action of HMA layer is key for perpetual pavement design. The traffic, axle load spectrum and pavement temperature of a perpetual pavement test road was analyzed by field measured data. The characteristic of asphalt layers dynamic strain pulse was analyzed and regression models were constructed based on controlled axle load truck tests, which could correlate the maximum longitudinal tensile strain to pavement temperature and axle load. Based on the axle load spectrum, temperature distribution and strain regression models, the pavement strain distribution in a year was calculated. According to the fatigue limit theory, the cumulative damage method was used to calculate the pavement fatigue life, and the fatigue life of perpetual pavement test road was analyzed.更多还原