裂缝深度对沥青路面动力响应的影响

以动力学、断裂力学和有限元理论为基础,应用ABAQUS有限元软件,建立带裂缝沥青路面结构三维有限元模型,分析了不同行车速度、裂缝深度对结构动力响应的影响。研究结果表明:无裂缝路面结构的路面弯沉随着行车速度的增加而减小,面层层底最大拉应变和面层最大剪应力则对行车速度不敏感。当沥青路面面层已开裂,应力强度因子和路面弯沉随着裂缝深度的增加而增大,面层层底最大拉应变和面层最大剪应力则均比元裂缝时小,层底最大拉应变随着行车速度的增加而增大。

Influence of Crack Depth on Dynamic Response of Asphalt Pavement

A 3D finite element analysis model of cracked asphalt pavement was established by the FEM software ABAQUS, based on dynamic mechanics, fracture mechanics and finite element theory. This paper studies the influence of various vehicle speeds, crack depths on the dynamic response. The results showed that the surface deflection decreased with the increase of vehicle velocity when there was no crack in pavement. But the maximum tensile strain at the bottom of the asphalt layer and the maximum shear stress of asphalt layer were insensitive to vehicle velocity. When the surface layer of asphalt pavement had cracked, both the stress intensity factors （SIF） and the surface deflection increased with the crack depth increasing. The maximum tensile strain at the bottom of the asphalt layer and the maximum shear stress of asphalt layer were also smaller than the asphalt pavement without crack, and the maximum tensile strain increased with the vehicle speed increasing.