中文摘要：

基于断裂力学基本理论,通过有限元数值模拟方法,研究了同时存在表面裂纹和反射裂纹的沥青路面在交通荷载作用下表面裂纹和反射裂纹开裂机制及扩展路径,深入讨论了路面材料和结构对裂纹扩展路径的影响,分析了表面裂纹的位置对反射裂纹扩展路径的影响,采用多裂纹小梁弯曲试验验证了多裂纹的扩展行为。结果表明：在交通荷载作用下,表面裂纹向着偏离载荷的方向扩展,且扩展路径几乎为直线,反射裂纹则沿着＂Z＂字形向上扩展;路面结构层模量和厚度的改变能够影响裂纹的扩展路径;反射裂纹总是向着存在表面裂纹的一侧扩展;小梁弯曲试验得到裂纹扩展行为与数值模拟结果一致。

英文摘要：

Based on the theory of fracture mechanics,the cracking mechanism and propagation analysis of asphalt pavement with top-down and reflect crack under vertical loads are studied by FEM numerical simulation.The effects of pavement material and structure are further discussed.The influence of the position of top-down crack to the propagation path of reflects crack is analyzed.The propagation behaviors are verified through beam bending test with multi-crack.The numerical results show that under the vertical loads the propagation path of the top-down crack is almost a straight line,which is departed from the load,while the reflect crack is propagated up-toward along a Z-shaped path.The propagation path of crack is influenced by the module and thickness of the pavement components;and the reflect crack is always propagated toward the sides where the top-down crack exists.The experimental results are consistent with the numerical results.