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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。
Based on the basic theory of fracture mechanics, through the finite element numerical simulation method, the cracking mechanism and propagation path of the surface crack and the reflection crack under the traffic load of asphalt pavement with the simultaneous existence of the surface crack and the reflection crack are studied. The effect of pavement materials and structure on the crack The effect of the crack propagation path on the crack propagation path is analyzed. The multi-crack beam bending test is used to verify the multi-crack propagation behavior. The results show that under the action of traffic load, the surface crack propagates away from the load, and the propagation path is almost straight line. The reflection crack propagates upward along the “Z” shape. The change of the modulus and thickness of pavement structure layer can influence Crack propagation path; the reflected crack always extends to the side where the surface crack exists; the crack propagation behavior obtained by the beam bending test is consistent with the numerical simulation.