Simulating floodwater movement in pavements for developing post-flooding time-depth-damage functions
Simulating floodwater movement in pavements for developing post-flooding time-depth-damage functions
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DOI：
10.1016/j.conbuildmat.2023.132408
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发表时间：
2023-09
影响因子：
7.4
通讯作者：
Y. Qiao;Shuyue Zhang;Ya-Xiu Wang;A. Dawson;C. Wake;Tao Ma
中科院分区：
文献类型：
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作者：
Y. Qiao;Shuyue Zhang;Ya-Xiu Wang;A. Dawson;C. Wake;Tao Ma
洪水对世界各地的民用基础设施造成了严重破坏。路面是受洪灾影响最大的基础设施之一，然而，洪灾后路面破损的量化问题直到最近才引起人们的重视。关于洪水如何在人行道内流动，以及洪水将如何影响洪水后的人行道损坏的知识，仍存在差距。本研究采用有限元渗流模型，对三种不同洪水情景下的三种不同路面的洪水运动进行了观测。为了验证模型的准确性，进行了实验室测试。结果表明，有限元渗流模拟结果与室内试验结果表明，路面在淹水后的弱化和恢复特性基本一致。由于土壤水分与吸力有关的滞后性，恢复阶段比弱化阶段长得多。基层在弱化阶段的刚度急剧下降，比任何研究的路基材料都严重。本文所报道的更好的理解可以促进洪水后路面时间深度破坏函数的发展。它将能够量化洪灾后的损失，从而便于在实践中估计洪灾造成的经济损失。
Flooding has caused severe damage to civil infrastructure worldwide. Roadway pavements are one of the infrastructures most affected by flooding, however, quantification of post-flooding pavement damage has not received attention until recently. There remains a gap to advance knowledge on how floodwater moves inside pavements and, consequently, how it will impact post-flooding pavement damage. This study adopted finite element seepage modeling to observe floodwater movement in three different pavements, each under three flood scenarios. Laboratory testing is conducted to validate the accuracy of the model. It is concluded that both the finite element seepage modeling and laboratory testing show similar post-flooding weakening and recovery behavior in pavements. The recovery phase is much longer than the weakening phase, due to the hysteretic nature of soil moisture related to suction. The base layer loses stiffness drastically during the weakening phase, more than any studied subgrade materials. The improved understanding reported here can enhance the development of time-depth-damage functions for post-flooding pavements. It will enable the quantification of post-flooding damage and thus facilitate estimation of flood induced economic losses in practices.