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Analysis of Pore Water Pressure and Piping of Hydraulic Well

1
Korea Institute of Civil Engineering and Building Technology, Goyang-si 10223, Korea
2
Kumoh National Institute of Technology, Gumi-si 39177, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Inmaculada Pulido-Calvo
Water 2021, 13(4), 502; https://doi.org/10.3390/w13040502
Received: 15 December 2020 / Revised: 4 February 2021 / Accepted: 6 February 2021 / Published: 15 February 2021
(This article belongs to the Section Water Resources Management, Policy and Governance)
This paper shows the results of a field appliance study of the hydraulic well method to prevent embankment piping, which is proposed by the Japanese Matsuyama River National Highway Office. The large-scale embankment experiment and seepage analysis were conducted to examine the hydraulic well. The experimental procedure is focused on the pore water pressure. The water levels of the hydraulic well were compared with pore water pressure data, which were used to look over the seepage variations. Two different types of large-scale experiments were conducted according to the installation points of hydraulic wells. The seepage velocity results by the experiment were almost similar to those of the analyses. Further, the pore water pressure oriented from the water level variations in the hydraulic well showed similar patterns between the experiment and numerical analysis; however, deeper from the surface, the larger pore water pressure of the numerical analysis was calculated compared to the experimental values. In addition, the piping effect according to the water level and location of the hydraulic well was quantitatively examined for an embankment having a piping guide part. As a result of applying the hydraulic well to the point where piping occurred, the hydraulic well with a 1.0 m water level reduced the seepage velocity by up to 86%. This is because the difference in the water level between the riverside and the protected side is reduced, and it resulted in reducing the seepage pressure. As a result of the theoretical and numerical hydraulic gradient analysis according to the change in the water level of the hydraulic well, the hydraulic gradient decreased linearly according to the water level of the hydraulic well. From the results according to the location of the hydraulic well, installation of it at the point where piping occurred was found to be the most effective. A hydraulic well is a good device for preventing the piping of an embankment if it is installed at the piping point and the proper water level of the hydraulic well is applied. View Full-Text
Keywords: embankment; hydraulic well; large-scale test; piping; seepage analysis embankment; hydraulic well; large-scale test; piping; seepage analysis
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MDPI and ACS Style

Kim, J.; Han, H.; Jin, Y. Analysis of Pore Water Pressure and Piping of Hydraulic Well. Water 2021, 13, 502. https://doi.org/10.3390/w13040502

AMA Style

Kim J, Han H, Jin Y. Analysis of Pore Water Pressure and Piping of Hydraulic Well. Water. 2021; 13(4):502. https://doi.org/10.3390/w13040502

Chicago/Turabian Style

Kim, Jinman; Han, Heuisoo; Jin, Yoonhwa. 2021. "Analysis of Pore Water Pressure and Piping of Hydraulic Well" Water 13, no. 4: 502. https://doi.org/10.3390/w13040502

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