School of Highway, Chang'an University, South Erhuan Middle Section, Xi'an, 710064, China.
Chang'an University, China; National University of Singapore, Singapore.
J Environ Manage. 2019 May 15;238:136-143. doi: 10.1016/j.jenvman.2019.02.119. Epub 2019 Mar 5.
Many different test methods are used in practice to evaluate the surface infiltration performance of permeable pavements. This has led to inconsistency in reporting of test results. This study recognizes the differences in nature between a soil infiltration study and the surface infiltration evaluation of permeable pavements, and identifies the main issues associated with the current practice of surface infiltration testing. It proposes that hydraulic conductivity be adopted as the flow property for measurement and reporting instead of the commonly used infiltration rate. The advantages of measuring hydraulic conductivity are elaborated from both theoretical and practical implementation points of view. The theoretical merits of providing a consistent and integrated treatment of surface infiltration performance of a permeable pavement during the design, construction and maintenance phases are presented. The practical benefits are addressed from the following aspects: consistency between laboratory and field testing, uniformity in reporting of test measurements, rationality in construction quality control and acceptance checking, effectiveness in surface infiltration performance monitoring, and enhanced ability in implementing effective maintenance management. It is emphasized that the techniques and methods needed for measuring hydraulic conductivity of permeable pavement materials, for laboratory testing as well as on-site field testing, are already readily available and have been used by researchers and some practitioners for surface infiltration testing. Two falling-head test methods are recommended: one applies Darcy's law and determines hydraulic conductivity in the conventional way; another measures the time history of falling head and calculates hydraulic conductivity using a modified Darcy equation. It is also highlighted that the measurement of hydraulic conductivity offers a convenient platform for assessing the durability of a permeable pavement against clogging.
许多不同的测试方法在实际中用于评估透水铺面的表面渗透性能。这导致测试结果的报告不一致。本研究认识到土壤渗透研究和透水铺面表面渗透评估之间的性质差异，并确定了与当前表面渗透测试实践相关的主要问题。它建议采用水力传导率作为测量和报告的流动特性，而不是常用的渗透速率。从理论和实际实施的角度详细阐述了测量水力传导率的优点。提出了在设计、施工和维护阶段为透水铺面的表面渗透性能提供一致和综合处理的理论优点。从以下几个方面讨论了实际效益：实验室和现场测试之间的一致性、测试测量报告的均匀性、施工质量控制和验收的合理性、表面渗透性能监测的有效性以及实施有效维护管理的能力增强。强调了测量透水铺面材料水力传导率所需的技术和方法，无论是在实验室测试还是现场实地测试中，都已经现成可用，并已被研究人员和一些从业者用于表面渗透测试。推荐了两种落头测试方法：一种应用达西定律，以传统方式确定水力传导率；另一种测量落头的时间历史，并使用修正后的达西方程计算水力传导率。还强调了水力传导率的测量为评估透水铺面抗堵塞的耐久性提供了一个方便的平台。
