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以半刚性基层沥青路面结构作为研究对象,采用Ansys有限元程序建立沥青面层预含不同深度的初始裂缝的二维有限元模型,研究不同降温过程对沥青面层的力学影响。结果表明:存在微裂纹的沥青路面,在急剧的降温过程中可能导致面层产生Top-Down裂缝。降温过程中,拉应力随着深度的增加逐渐减小;初始裂缝深度越长,降温过程中张开型断裂强度因子KⅠ越大,也就越容易开裂;随着降温幅度的增加,拉应力和张开型断裂强度因子KⅠ均迅速增加,Top-Down裂缝的发展速度也就越快。
Based on the semi-rigid asphalt pavement structure, Ansys finite element program was used to establish a two-dimensional finite element model of asphalt pavement pre-containing initial fractures with different depths to study the mechanical effects of different cooling processes on the asphalt pavement. The results show that the microcracking asphalt pavement may cause Top-Down cracks in the surface layer during the rapid cooling process. During the cooling process, the tensile stress decreases with the increase of the depth. The longer the initial fracture depth, the larger the fracture type tensile strength factor K I in the process of cooling, and the easier it cracks. With the increase of the cooling rate, the tensile stress and Open type fracture strength factor K Ⅰ are rapidly increasing, Top-Down cracks faster development.