Water infiltration through pavement structures as a result of flooding and/or extreme rainfalls, can adversely influence the bearing capacity of the pavement and lead to its premature failure. Since the entire pavement system will not be always in saturated state, the post-flood water movement throughout its granular layers should be formulated based on unsaturated flow principles. This study is aimed at developing a practical numerical model for simulating the partially saturated water flow in pavements caused by surface infiltration. To this end, available numerical methods and software packages are evaluated based on the relative merits of availability and computational rigor. The selected method is validated with published data. Existing correlations are used to reduce the number of inputs required for modeling. Subsequently, a parametric study is carried out to investigate the influence of material properties, such as aggregate gradation, and environmental conditions, such as rainfall intensity and duration, on the pavement’s response. Special cases, such as anisotropic material and clogged drainage are also modeled. This study provides an insight into the hydraulic behavior of pavement structures subjected to severe precipitation. In addition, this model establishes a solid basis for subsequent structural analyses to fully understand the behavior of inundated pavements under traffic loadings.

洪水和/或极端降雨造成的水通过人行道结构的渗透会不利地影响人行道的承载力并导致其过早损坏。由于整个路面系统将不会始终处于饱和状态，因此应基于非饱和流原理来制定洪水后整个颗粒层的水运动。这项研究旨在开发一种实用的数值模型，以模拟路面渗透引起的路面部分饱和水流。为此，基于可用性和计算严格性的相对优点评估可用的数值方法和软件包。所选方法已通过发布的数据进行验证。现有的相关性用于减少建模所需的输入数量。后来，进行了参数研究，以研究材料特性（例如骨料级配）和环境条件（例如降雨强度和持续时间）对人行道响应的影响。还对特殊情况（例如各向异性材料和排水堵塞）进行了建模。这项研究为遭受严重降雨的路面结构的水力行为提供了一个见识。此外，该模型为后续结构分析奠定了坚实的基础，以充分了解交通负荷下的淹没路面行为。这项研究为遭受严重降雨的路面结构的水力行为提供了一个见识。此外，该模型为后续结构分析奠定了坚实的基础，以充分了解交通负荷下的淹没路面行为。这项研究为遭受严重降雨的路面结构的水力行为提供了一个见识。此外，该模型为后续结构分析奠定了坚实的基础，以充分了解交通负荷下的淹没路面行为。