含裂缝沥青路面结构轮载响应分析

Mechanical responses of asphalt pavement structure w ith a crack under w heel load

采用Abaqus6.10有限元软件建立三维含裂缝路面结构模型,以Coulomb摩擦接触模拟路面裂缝力学行为,对含裂缝路面结构进行标准轮载力学响应分析。计算在标准轮载作用下路面结构顶面弯沉、基层及面层层底拉应力的大小及分布规律。研究表明,在轮载作用下,含裂缝路面结构在平行于裂缝方向的拉、压应力沿深度方向均增大;在轮载靠近裂缝边缘时水泥稳定基层层底出现峰值拉应力,路面结构以平行于裂缝的拉应力破坏为先导;裂缝的存在对弯沉影响很大,降低了路面结构的传荷能力和整体性,路面结构设计应考虑裂缝的影响。

The mechanical responses of pavement with a crack under standard wheel load were discussed. The three- dimensional model of pavement structure with a crack was built with Abaqus6. 10 program. The Coulomb friction model was used to simulate the behavior of the pavement crack under load. Surface deflections of the pavement, tension stress to the layer bottom of the base and asphalt pavement, were calculated. The result demonstrated that the tension and compression stress parallel to the crack direction along the depth of the pavement structure with crack were both increased under wheel load, and the peak tension stress of cement stabilized base appeared at the wheel load near to the crack. The pavement structure would be destroyed due to the tension stress parallel to crack first, and the capacity to transfer load and integrity of the pavement would be reduced with the crack. The impact of the crack should be taken in- to account in pavement structure design.