The dynamic water pressure will be caused at the surface of the bridge deck pavement when high-speed wheel load drive through. On the one hand, it can reduce the anti-sliding performance of the surfacing layer which is not conducive to traffic safety, on the other hand, dynamic water pressure will continuously scour pavement material and degrade the material performance. In order to explore the formation and evolution laws of dynamic water pressure on the pavement surface, analysis the factors influence on dynamic water pressure, the finite element method was used to establish the simulation calculation model, and the influence factors such as the water film thickness, different speed of wheel load and tire pattern depth were considered. The main conclusions are as follows: The finite element method to calculate the tire ground area and the vertical displacement can give reasonable geometry size of the tire in the computational fluid domain; the wheel drives through at high speed to squeeze the water at the surface. The tire pattern cannot discharge the water under the tire quickly, and most of the water that is stuck in the grounding area forms the dynamic water pressure. The value of the dynamic water pressure is positively correlated with the wheel load speed and the water film thickness. When the speed is 100km/h, the maximum dynamic water pressure is about 0.272MPa.
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