ABSTRACT

The pore-water pressure generated by intermittent dynamic vehicle loading under various saturation states is recognized as a critical factor influencing the behaviour of permeable pavement structures, especially the behaviour of UGB layer. However, the underlying mechanisms of hydro-mechanical interaction in the UGB layer and the influence on the pavement structure are still unclear. This study aims to characterize the changes in dynamic response in permeable pavement structures under various saturation conditions by considering the hydro-mechanical interaction within the UGB layer. To achieve this objective, a full-scale test track with a PUPM wearing course was constructed. Pressures and water distribution were characterized by embedded sensors within different layers of the test track when subjected to the accelerating pavement test. Based on the coupled SAME model, the water distribution and the dynamic response of UGB in the rainfall events were both characterised and solved by FEM. The results predicted by the proposed SAME model correspond to the field measurements, and the influence of the water content on the resilient modulus distribution within the UGB layer was then estimated. Based on the predictions for the stress state of the UGB layer, the sensitivity analysis was also proposed.

摘要

各种饱和状态下间歇性动态车辆加载产生的孔隙水压力被认为是影响透水路面结构行为，尤其是UGB层行为的关键因素。然而，UGB层中流体力学相互作用的潜在机制以及对路面结构的影响仍不清楚。本研究旨在通过考虑 UGB 层内的水力-机械相互作用来表征在各种饱和条件下透水路面结构的动力响应变化。为实现这一目标，建造了一条带有 PUPM 磨损课程的全尺寸测试跑道。当进行加速路面测试时，压力和水分布通过测试轨道不同层内的嵌入式传感器进行表征。基于耦合SAME模型，利用有限元法对降雨事件中UGB的水分布和动力响应进行了表征和求解。所提出的 SAME 模型预测的结果对应于现场测量，然后估计了含水量对 UGB 层内弹性模量分布的影响。基于对UGB层应力状态的预测，还提出了敏感性分析。