Author(s)

Yangyang Li, Zhaoxia Tong, Yang Chen and Zhengguo Gao

Corresponding Author

Yangyang Li

ABSTRACT

The impact loading has a significant effect on the failure of the cement concrete pavement with the initial cracks. In this paper, the numerical simulation method is used to explore the dynamic response of cement concrete pavement with different initial crack lengths under variable amplitude impact loadings. It is found that the length of crack propagation increases rapidly with the increase of load amplitude. However, the increase rate will slow down as the load amplitude increases to a certain amount. The settlement mainly occurs in the loess layer. With the increase of the load amplitude, the settlement at the loading center point will increase, and the time of occurrence will also lag behind the time of the peak load. The deformation of the loess layer changes from elastic compression to elastic-plastic compression. When the initial crack length is small relative to the thickness of the surface layer, it has a significant effect on crack propagation and settlement. And with the increase of the load amount, the influence of the initial crack length on the settlement increases in turn.

KEYWORDS

Impact load; cement concrete pavement; XFEM; crack; settlement