Influence of a permeable sand layer on the mechanism of backward erosion piping using 3D pipe depth measurements.
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| Title: | Influence of a permeable sand layer on the mechanism of backward erosion piping using 3D pipe depth measurements. |
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| Authors: | Akrami, Sepideh1 (AUTHOR) Sepideh.akrami@ugent.be, Bezuijen, Adam1,2 (AUTHOR), van Beek, Vera2 (AUTHOR), Terwindt, Jarno2 (AUTHOR) |
| Source: | Acta Geotechnica. Dec2021, Vol. 16 Issue 12, p3881-3898. 18p. |
| Subjects: | Bathymetry, Erosion, Material erosion, Sand, Hydraulic conductivity, Structural stability |
| Abstract: | Backward erosion piping (BEP) poses a threat to the stability of water-retaining structures. This can lead to severe erosion and collapse of embankments. A novel economically appealing measure against BEP is the coarse sand barrier (CSB). The CSB is a trench filled with coarse sand that is placed below the blanket layer on the landward side of the embankment, which prevents the pipe from developing upstream when it encounters the CSB. Inclusion of a CSB creates a vertically layered sand, which is the situation that can also exist in practice but is different from traditional BEP tests with one homogeneous sand. This paper presents new observations and measurements in medium-scale laboratory tests. 3D measurements of the pipe depth and dimensions are presented and analysed. This analysis indicates how the pipe dimensions evolve during the piping process and shows the erosion mechanism for BEP in vertically layered sands. The findings demonstrate the significance of three-dimensional study of the pipe rather than two dimensions. The pipe depth, width and depth-to-width ratios at the pipe tip in critical erosion stages are measured and presented. In the presented tests, two different erosion behaviours (stepwise pipe progression until failure and straight failure) are found and analysed with respect to possible influential parameters. Higher head drops and flow rates are found in tests with straight failure at the stage before progression. A linear relationship between the hydraulic conductivity contrast (kc) and the critical head drops (hc) is found and observations are used to investigate deviations from the line. [ABSTRACT FROM AUTHOR] |
| Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 153818480 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Influence of a permeable sand layer on the mechanism of backward erosion piping using 3D pipe depth measurements. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Akrami%2C+Sepideh%22">Akrami, Sepideh</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Sepideh.akrami@ugent.be</i><br /><searchLink fieldCode="AR" term="%22Bezuijen%2C+Adam%22">Bezuijen, Adam</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22van+Beek%2C+Vera%22">van Beek, Vera</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Terwindt%2C+Jarno%22">Terwindt, Jarno</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Acta+Geotechnica%22">Acta Geotechnica</searchLink>. Dec2021, Vol. 16 Issue 12, p3881-3898. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Bathymetry%22">Bathymetry</searchLink><br /><searchLink fieldCode="DE" term="%22Erosion%22">Erosion</searchLink><br /><searchLink fieldCode="DE" term="%22Material+erosion%22">Material erosion</searchLink><br /><searchLink fieldCode="DE" term="%22Sand%22">Sand</searchLink><br /><searchLink fieldCode="DE" term="%22Hydraulic+conductivity%22">Hydraulic conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+stability%22">Structural stability</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Backward erosion piping (BEP) poses a threat to the stability of water-retaining structures. This can lead to severe erosion and collapse of embankments. A novel economically appealing measure against BEP is the coarse sand barrier (CSB). The CSB is a trench filled with coarse sand that is placed below the blanket layer on the landward side of the embankment, which prevents the pipe from developing upstream when it encounters the CSB. Inclusion of a CSB creates a vertically layered sand, which is the situation that can also exist in practice but is different from traditional BEP tests with one homogeneous sand. This paper presents new observations and measurements in medium-scale laboratory tests. 3D measurements of the pipe depth and dimensions are presented and analysed. This analysis indicates how the pipe dimensions evolve during the piping process and shows the erosion mechanism for BEP in vertically layered sands. The findings demonstrate the significance of three-dimensional study of the pipe rather than two dimensions. The pipe depth, width and depth-to-width ratios at the pipe tip in critical erosion stages are measured and presented. In the presented tests, two different erosion behaviours (stepwise pipe progression until failure and straight failure) are found and analysed with respect to possible influential parameters. Higher head drops and flow rates are found in tests with straight failure at the stage before progression. A linear relationship between the hydraulic conductivity contrast (kc) and the critical head drops (hc) is found and observations are used to investigate deviations from the line. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s11440-021-01350-2 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 3881 Subjects: – SubjectFull: Bathymetry Type: general – SubjectFull: Erosion Type: general – SubjectFull: Material erosion Type: general – SubjectFull: Sand Type: general – SubjectFull: Hydraulic conductivity Type: general – SubjectFull: Structural stability Type: general Titles: – TitleFull: Influence of a permeable sand layer on the mechanism of backward erosion piping using 3D pipe depth measurements. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Akrami, Sepideh – PersonEntity: Name: NameFull: Bezuijen, Adam – PersonEntity: Name: NameFull: van Beek, Vera – PersonEntity: Name: NameFull: Terwindt, Jarno IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2021 Type: published Y: 2021 Identifiers: – Type: issn-print Value: 18611125 Numbering: – Type: volume Value: 16 – Type: issue Value: 12 Titles: – TitleFull: Acta Geotechnica Type: main |
| ResultId | 1 |
