【摘要】 为了深入研究AC+CRC复合式路面在温缩应力作用下的反射裂缝疲劳扩展规律，基于扩展有限元(XFEM)方法和能量释放率改进型Paris公式，对AC+CRC复合式路面温缩型反射裂缝疲劳扩展过程和影响因素进行了动态模拟和分析，得到了温缩应力循环作用次数与沥青面层内裂缝长度的关系和裂缝尖端能量释放率变化规律。结果表明，连续配筋混凝土基层温度变化较小时，可降低裂缝尖端能量释放率，延长面层疲劳寿命；沥青面层疲劳寿命随着基层配筋率提高而延长，有效抵抗裂缝扩展的面层厚度增加；能量释放率极限值较高的沥青面层疲劳寿命较长，抵抗反射裂缝扩展的能力增强。更多还原

【Abstract】 In order to study the fatigue propagation law of AC+CRC composite pavement under thermal shrinkage stress, the fatigue propagation process and influencing factors of AC+CRC composite pavement under thermal shrinkage stress were simulated and analyzed dynamically based on the extended finite element method(XFEM) and the improved energy release rate Paris equation.The relationship between the cyclic action times of temperature-shrinkage stress and the length of crack in asphalt surface, and the variation rule of energy release rate of crack tip were obtained with the simulation analysis.The results show that the energy release rate of crack tip can be reduced and the fatigue life of the surface course can be prolonged with lower temperature change of continuous reinforced concrete base.The fatigue life of asphalt surface course and the surface thickness of effective resistance to crack propagation increase with the increase of base reinforcement ratio.The asphalt surface course with higher energy release rate limit has longer fatigue life and better resistance to reflection crack propagation.更多还原