雨洪所产生的水分流经道路表面然后渗入道路内部是一个复杂的水分迁移过程，分为表面径流和内部渗流两种模式。目前，国内外研究主要聚焦于径流、渗流两种模式各自的机理。申请人通过前期研究发现径流、渗流具有相互影响性，但其相互影响的耦合机理尚未明确。本项目以雨洪条件下道路整体水分迁移为研究对象，紧密围绕径流-渗流耦合作用这一关键科学问题进行研究：①开展径流、渗流水分迁移机理的研究，明确两种模式尤其是渗流的水分迁移时空演变规律；②揭示径流、渗流耦合作用机理，开发基于径流、渗流耦合作用的道路整体水分迁移数值仿真模型，并使用基于智能传感器的实验室物理模型进行验证；③提出基于地域降雨数据的积水风险的量化方法，并使用价值工程方法建立低积水风险道路设计的优化方法。本项目的实施对促进道路整体透水理论发展，指导建造低积水风险道路，提高城市对洪涝灾害的预防、抵御能力具有重要的科学和实践意义。

Rainfall flooding can generate complex water movements that penetrate pavement systems. In general, the water movements can be divided into two modes, including surface runoff and seepage. At present, international and domestic studies focus on the separated mechanisms of the two modes. However, the coupling effects of the two modes remain unsolved. This study aims at investigating the coupling effects of surface runoff and seepage for pavements during rainfall conditions, focusing on water movements in saturated/unsaturated soil materials. First, hydraulic mechanisms of runoff and seepage are studied separately, regarding water movements in spatial and temporal dimensions, with a focus on the seepage. Then, the mechanisms are combined to understand the coupling effects between the two modes, and a simulation model is established to model the coupling effects. A laboratory pavement model is established with smart sensors to validate the simulation platform. Furthermore, a method is proposed to quantify the risk of water accumulation during precipitations, with prior knowledge on rainfall patterns. Moreover, a novel pavement design optimization principle is developed for building pavements with low inundation risk, based on value engineering. This research can advance knowledge in the mechanism of water movements on and in pavements. The results will be meaningful for road infrastructure to achieve prompt response and prevention of flooding.