Deformation Characteristics of Permeable Asphalt Pavements under Repeated Loading

透水沥青路面已被用于减少新开发项目的雨水径流。然而，考虑到路面在交通繁忙的道路上的应用，路面的耐久性是一个很大的问题。本研究通过对非饱和/饱和条件下模拟透水沥青路面的模型路面进行循环平板加载试验，研究渗水的高饱和度与反复加载相结合对透水沥青路面长期变形行为的影响。从试验结果来看，对于路面的变形，无论路基土类型如何，饱和模型的永久变形都比天然含水量模型的永久变形大5 ~ 6倍。作为变形行为的一种机制，当路基为粘性土时，路基的大塑性变形是主要原因。另一方面，当路基为砂质土时，考虑到试验结果路基表面沉降很小，且与饱和度无关，基底压缩可能是主要原因。

Permeable asphalt pavements have been used to reduce stormwater runoff from new development. However, considering application of the pavements into heavy traffic roadways, pavement durability is a great concern. In this study, cyclic plate loading tests have been carried out for model pavements simulating permeable asphalt pavements under unsaturated/ saturated conditions to investigate the effect of the combination of high saturation degree by seepage water and repeated loading on the long-term deformational behavior of permeable asphalt pavements. From the test results, regarding deformation of a pavement surface, it was confirmed that the permanent deformation of the saturated models was five or six times larger than that of the models with natural water content regardless of subgrade soil type. As a mechanism of the deformational behavior, in the case the subgrade was cohesive soil, large plastic deformation of the subgrade was a major cause. On the other hand in the case the subgrade was sandy soil, compression of the subbase could be a major cause, considering the test result that settlement of subgrade surface was very small and it did not depend on saturation degree.