Dynamic Response of Fully Permeable Pavements: Development of Pore Pressures under Different Modes of Loading
Dynamic Response of Fully Permeable Pavements: Development of Pore Pressures under Different Modes of Loading
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DOI：
10.1061/(asce)mt.1943-5533.0003217
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发表时间：
2020-07-01
影响因子：
3.2
通讯作者：
Grabe, Juergen
中科院分区：
文献类型：
--
作者：
Lu, Guoyang;Toerzs, Tom;Grabe, Juergen
透水性路面被广泛认为是改善传统密集路面环境和生态方面的有效途径。基于传统的路面材料，透水路面通常被设计成部分透水或仅由透水表面组成。近年来，新型聚氨酯透水混合料（PUPM）的发展使得全透水路面（FPP）结构的广泛应用成为可能，这将增加透水路面的环境效益。在这种情况下，路面的饱和度对FPP的性能有很大的影响。孔压的产生和消散是影响透水路面结构承载力的关键因素。在文献中，只有很少的研究集中在交通荷载下透水路面的孔隙水压力。本研究的目的是测量和表征孔隙压力的变化，在全尺寸的透水路面在各种饱和条件下的交通荷载。为了实现这一目标，孔隙压力数据收集从实验室测试，以及从一个全尺寸的测试轨道建造与聚乙烯粘合的透水混合物（PUPM）磨损过程。基于这项研究，它被发现，当透水性路面材料受到循环荷载，孔隙水压力是远远大于孔隙空气压力，事实上，后者被发现是可以忽略不计的。在灌水过程和车辆荷载作用下，孔隙水压力随饱和度的增加而增加。与磨耗层以下透水层相比，PUPM表层孔隙水压力变化不明显。在循环荷载作用下，各层累积孔隙水压力随循环次数的增加而增加，随饱和度的增加而增加。这些研究结果支持寻求深入了解的应力状态和降解机制FPP。研究结果为FPP的广泛应用提供了实用的结论和优化的设计性能。
Permeable pavements are widely recognized as an effective way to improve the environmental and ecological aspects of conventional dense pavements. Based on traditional pavement materials, permeable pavements are often designed to be partially permeable or to consist of merely permeable surfaces. Recently, the development of novel polyurethane-bound pervious mixtures (PUPM) has made the widespread application of fully permeable pavement (FPP) structures possible, which will increase the environmental benefits of permeable pavements. In this case, the saturation of a pavement has a major influence on the performance of FPP. The generation and dissipation of pore pressure is recognized as a critical factor, influencing the bearing capacity of permeable pavement structures. In literature, only few studies focus on the pore pressure in permeable pavements under traffic loading. This study aims to measure and characterize the changes in pore pressure in a full-scale permeable pavement under various saturation conditions under traffic loading. To achieve this objective, pore pressure data was collected from laboratory testing as well as from a full-scale test track constructed with a polyurethane-bounded pervious mixture (PUPM) wearing course. Based on this study, it is found that when permeable pavement material is subjected to cyclic loading, the pore water pressure is much larger than the pore air pressure; in fact, the latter is found to be negligible. During the irrigation process and dynamic vehicle loading, the pore water pressure increases as the saturation increases. The changes of pore water pressure are not obvious in the PUPM surface layer when comparing the results to the pervious layers below the wearing course. Under cyclic vehicle loading, the accumulated pore water pressure of each layer increases with the number of loading cycles and also increases as the saturation increases. These findings support the quest for an in-depth understanding of the stress state and the degradation mechanisms in FPP. The results provide practical conclusions and recommend optimized design properties for a wide application of FPP.