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为了研究沥青路面结构在车辆荷载作用下的疲劳损伤演化特性,并分析其形变规律,运用通用有限元软件ABAQUS及其二次开发平台,建立考虑路面材料非线性疲劳损伤的沥青路面结构数值计算模型,分析沥青路面结构在车辆荷载反复作用下路面结构损伤和路面结构水平正应变的空间分布及演化规律,以及路表弯沉随荷载作用的演变规律。结果表明:路面结构损伤主要分布在双轮中心线下靠近层底的区域,基层层底与底基层层底损伤度随荷载作用均增加,且增加幅度逐渐增大;靠近层底位置拉应变逐渐增大,且增加幅度逐渐增大,中性轴上移;路表弯沉在荷载作用下逐渐增大,增大幅度逐渐增大,其规律与相关实测结果相符。研究结果可为沥青路面结构设计、养护维修及长期性能预测提供理论支撑。
In order to study the fatigue damage evolution characteristics of asphalt pavement structure under vehicle load and analyze its deformation law, the common finite element software ABAQUS and its secondary development platform are used to establish the numerical model of asphalt pavement structure considering the nonlinear fatigue damage of pavement materials , Analyzes the spatial distribution and evolution of asphalt pavement structure under the action of repeated vehicle loads and the horizontal normal strain of the pavement structure, as well as the evolution of road surface deflection with load. The results show that the damage of pavement structure is mainly distributed in the area near the floor under the centerline of the two wheels. The damage degree of the base layer and the basement layer increases with the increase of load, and the increasing amplitude gradually increases. Increase, and the increasing amplitude increases gradually, the neutral axis moves upward; the deflection of road surface increases gradually under the action of load, and the increasing amplitude gradually increases. Its regularity is consistent with the related measured results. The results can provide theoretical support for asphalt pavement structure design, maintenance and repair and long-term performance prediction.