沥青混凝土路面多孔混凝土基层的疲劳性能

多孔混凝土作为沥青混凝土路面的基层时，和面层一起受到车辆荷载和温度的反复作用，结构设计中需考虑其疲劳性能。通过室内小梁弯拉疲劳试验，分析疲劳寿命试验数据的概率分布，得出多孔混凝土疲劳寿命服从双参数威布尔分布，以此建立了不同应力水平和等效应力水平下两种形式的疲劳方程；分析了疲劳寿命变异性的影响因素及减小变异性的相应措施，比较得出其疲劳性能优于半刚性基层材料。利用得出的疲劳方程，建立了多孔混凝土作为沥青混凝土路面基层时，进行层底弯拉应力验算的弯拉强度结构系数，可用于路面结构计算。

A Study on Fatigue Property of Porous Concrete Base Course of Bituminous Pavements

As base course material, porous concrete withstands the repeated actions of traffic and temperature, so the fatigue property should be considered in structure design. According to indoor flexural fatigue tests, the probability distribution of fatigue life is analyzed, that the fatigue life of porous concrete obeys the two-parameter Weibull distribution drown, and the two types of fatigue equation under different stress levels and equivalent stress level are established. The influencing factors of fatigue life and corresponding measures to reduce the variability are also analyzed. It is got that the fatigue property of concrete is better than the semi-rigid base materials. At last, with the fatigue equation, the structure coefficient of flexural tensile strength which is used in the base course of flexural stress check may be applied to the pavement structure calculation for porous concrete as base of asphalt pavement.