透水沥青（Permeable asphalt concrete, PAC）路面是道路实现排水与降噪功能的重要手段。然而，现行PAC路面在内部孔隙堆积、连通与演化规律等方面的研究仍未形成体系，基于宏观表象指标评价体系难以为当前渗透功能与路用性能耐久性不足问题提供科学、系统的解决措施。为此，本项目以双层PAC路面为研究对象，探究其内部孔隙在多因素下的渗流规律与耐久性优化调控机制。首先，从PAC混合料渗透性能多影响因素耦合机理入手，建立以渗透速率为指标的多因素协同调控模型；其次，基于层间等渗透速率原则，依据调控模型优化传统双层PAC路面结构，提出以渗透功能与路用性能双耐久为目标的优化设计流程与三层PAC路面组合形式；最后，借助工业CT、虚拟重构与离散元计算方法，获取孔隙结构细观尺度演变规律，揭示三层PAC路面组合形式的双耐久增强机理。预期研究成果能为PAC路面耐久性问题提供新的认识和应对策略。

Permeable asphalt concrete (PAC) pavement is one of the important means to achieve drainage and noise reduction functions. However, the current research on the internal pore accumulation, connectivity and evolution in PAC pavement has not yet formed a system. Moreover, the evaluation system of PAC pavement based on macro performance indicators, is still difficult to propose a scientific and systematic solution to the durability problems of percolation and pavement performance in PAC pavement. So this study takes double-layer PAC pavement as the research sample, to investigate the penetration rules and optimum design mechanism of the pores in PAC pavement based on the effects of multi-factor coupling. Firstly, a multi-factor collaborative control model of PAC mixture based on the penetration rate is established with the permeability performance research of the double-layer PAC pavement under the effects of multi-factor coupling. Secondly, based on the model, the structure of current double-layer PAC pavement is optimized with the principle of "equal penetration rate among layers"; meanwhile, the design processes are also formulated with the goal of improving the "double-durability" on penetration function and pavement performance, to propose the structural design of the three-layer PAC pavement. Finally, with the help of industrial CT, digital reconstruction and discrete element calculation methods, the mesoscale evolution rule of the pore structure is obtained, and the double-durability enhancement mechanism of the established three-layer PAC pavement is revealed. It is expected that the research results could provide new ideas and strategies for solving key issues in the field of PAC pavement durability.