Experimental study on bed pressure around geotextile mattress with sloping plate.

A geotextile mattress with sloping curtain is a newly proposed countermeasure against river and estuarine scour. In previous laboratory experiments, a geotextile mattress with sloping curtain was capable of protecting the bed downstream from scour and stimulating sediment deposition on both sides. H...

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Main Authors: Liquan Xie, Yehui Zhu, YanHong Li, Tsung-Chow Su
Format: Article
Language:English
Published: Public Library of Science (PLoS) 2019-01-01
Series:PLoS ONE
Online Access:https://doi.org/10.1371/journal.pone.0211312
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author Liquan Xie
Yehui Zhu
YanHong Li
Tsung-Chow Su
author_facet Liquan Xie
Yehui Zhu
YanHong Li
Tsung-Chow Su
author_sort Liquan Xie
collection DOAJ
description A geotextile mattress with sloping curtain is a newly proposed countermeasure against river and estuarine scour. In previous laboratory experiments, a geotextile mattress with sloping curtain was capable of protecting the bed downstream from scour and stimulating sediment deposition on both sides. However, the seepage scour under its geotextile mattress is inadequately researched at present. In this study, the Geotextile Mattress with Sloping Plate (GMSP) is proposed based on the simplification of the geotextile mattress with sloping curtain with the construction feasibility considered. A series of experiments was conducted to investigate the pressure distribution around the GMSP and the averaged seepage hydraulic gradient beneath its mattress. The results indicate remarkable pressure difference on two sides of the GMSP. The minimum bed pressure appears about 1.3 times the plate height downstream to the GMSP. The averaged seepage hydraulic gradient beneath the mattress increases with the sloping angle increasing from 35° to 60° in general. The averaged hydraulic gradient also ascends as the relative plate height increases, but reduces as the opening ratio increases at opening ratios greater than 0.143. The safety boundary for the averaged hydraulic gradient under the geotextile mattress of the GMSP could get much smaller than the critical hydraulic gradient of piping and can easily be overwhelmed. This phenomenon can mainly be attributed to the discontinuous contact between the mattress and the seabed. A suggestion for the parametric design of the GMSP is to extend the width of the mattress to reduce the risk of seepage failure.
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spelling doaj.art-8efa82db98f640309e67dd651225ddc32022-12-21T18:38:22ZengPublic Library of Science (PLoS)PLoS ONE1932-62032019-01-01141e021131210.1371/journal.pone.0211312Experimental study on bed pressure around geotextile mattress with sloping plate.Liquan XieYehui ZhuYanHong LiTsung-Chow SuA geotextile mattress with sloping curtain is a newly proposed countermeasure against river and estuarine scour. In previous laboratory experiments, a geotextile mattress with sloping curtain was capable of protecting the bed downstream from scour and stimulating sediment deposition on both sides. However, the seepage scour under its geotextile mattress is inadequately researched at present. In this study, the Geotextile Mattress with Sloping Plate (GMSP) is proposed based on the simplification of the geotextile mattress with sloping curtain with the construction feasibility considered. A series of experiments was conducted to investigate the pressure distribution around the GMSP and the averaged seepage hydraulic gradient beneath its mattress. The results indicate remarkable pressure difference on two sides of the GMSP. The minimum bed pressure appears about 1.3 times the plate height downstream to the GMSP. The averaged seepage hydraulic gradient beneath the mattress increases with the sloping angle increasing from 35° to 60° in general. The averaged hydraulic gradient also ascends as the relative plate height increases, but reduces as the opening ratio increases at opening ratios greater than 0.143. The safety boundary for the averaged hydraulic gradient under the geotextile mattress of the GMSP could get much smaller than the critical hydraulic gradient of piping and can easily be overwhelmed. This phenomenon can mainly be attributed to the discontinuous contact between the mattress and the seabed. A suggestion for the parametric design of the GMSP is to extend the width of the mattress to reduce the risk of seepage failure.https://doi.org/10.1371/journal.pone.0211312
spellingShingle Liquan Xie
Yehui Zhu
YanHong Li
Tsung-Chow Su
Experimental study on bed pressure around geotextile mattress with sloping plate.
PLoS ONE
title Experimental study on bed pressure around geotextile mattress with sloping plate.
title_full Experimental study on bed pressure around geotextile mattress with sloping plate.
title_fullStr Experimental study on bed pressure around geotextile mattress with sloping plate.
title_full_unstemmed Experimental study on bed pressure around geotextile mattress with sloping plate.
title_short Experimental study on bed pressure around geotextile mattress with sloping plate.
title_sort experimental study on bed pressure around geotextile mattress with sloping plate
url https://doi.org/10.1371/journal.pone.0211312
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AT yehuizhu experimentalstudyonbedpressurearoundgeotextilemattresswithslopingplate
AT yanhongli experimentalstudyonbedpressurearoundgeotextilemattresswithslopingplate
AT tsungchowsu experimentalstudyonbedpressurearoundgeotextilemattresswithslopingplate