At present, studies of pile-supported embankment focus mainly on the stress ratio of pile to soil and the soil arch effect under static loading, less considering effects of dynamic loading. But dynamic stress resulting from vehicle operation has a certain influence on the embankment of soil arch, which affects the overall behavior of pile-supported embankment. In order to analyze the change of bearing behavior of pile-supported embankment under static and dynamic loading, through visible laboratory test and analysis of particle flow code(PFC), the mechanism of stress transfer and deformation of pile-supported embankment under static and dynamic loading have been studied. Some factors affecting soil arching are investigated, such as filling height, pile cap size, pile spacing, reinforcing modes, loading frequency. The results show that the stress on top of piles decreases under dynamic loading, which resulted in increase of stress between piles and displacement of embankment. The effect of dynamic loading on unreinforced embankment is larger than that on reinforced embankment. And reinforcement material is helpful to reduce the impact of dynamic loading. The mechanisms of load transfer and deformation are different depending on the types and numbers of the geogrid; and the impact of dynamic loading is mainly related to the strength of the soil arch effect. In the case of piled embankment reinforced by two layer geogrids, because the mechanism of semi-rigid platform takes effect due to the interaction of reinforcement and the surrounding fill, the soil arching decreases which leads to the effect of dynamic loading minimally; and for embankment with a single geogrid, the impact by dynamic loading decreases remarkably when geogrid is set above 10 cm of top of piles compared with geogrid on the top of piles. The PFC simulation results confirm the above conclusion, and further conclud that with the increase of loading frequency and the filling soil height, the decrease of pile net spacing, the effect of dynamic loading increases.
