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Assessment of internal erosion in the glacial till core of a Swedish dam
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-5719-3056
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0003-1935-1743
2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Zoned embankment dams are a common type of dam in Sweden consisting of an impermeable central glacial till core flanked by zones of filter materials and rockfill shoulders. Dams with internal unstable core material allow fine particles to be transported by seepage, which may result in leakage paths and pore-pressure variations. These last two conditions are signs of initiated internal erosion. However, the effectiveness of the filter zone determines if the internal erosion will continue or not. This paper presents the assessment of internal erosion susceptibility of the glacial till core of a hydropower dam located in northern Sweden. The dam has experienced historical damages mainly in the form of sinkhole and leakage related to internal erosion. The study includes the analysis of the particle size distribution of samples obtained from boreholes, as well as a comparison of the geotechnical properties of the core with the Swedish dam safety guidelines available both during the dam construction in 1958 and today. The capability of the filter to stop the erosion process is not investigated.The results show that a well designed and constructed dams can be affected by local layers of internally unstable (suffusive) material susceptible to internal erosion.

The capability of the filter to stop the erosion process is not investigated.The results show that a well-designed and constructed dams can be affected by local layers of internally unstable (suffusive) material susceptible to internal erosion.

Place, publisher, year, edition, pages
2017.
Keyword [en]
internal erosion, glacial till, suffusion, filter, core, dam, embankment dams, Swedish dam, sinkhole, RIDAS, Vattenfall 1958, dam safety, internal instability, erosion, silty sandy gravel, moraine
Keyword [es]
erosion interna, presas, presas de tierra, núcleo, filtro, grava arenosa limosa, internamente inestable
National Category
Geotechnical Engineering Other Civil Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-65289OAI: oai:DiVA.org:ltu-65289DiVA: diva2:1135680
Conference
85th Annual Meeting of International Commission on Large Dams (ICOLD 2017), Prague, Czech Republic, July 3–7, 2017
Available from: 2017-08-23 Created: 2017-08-23 Last updated: 2017-08-30Bibliographically approved

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Silva et al. (2017)_ ICOLD 2017(1020 kB)6 downloads
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Silva, IngridLindblom, JennyViklander, PeterLaue, Jan
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Citation style
  • apa
  • ieee
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Output format
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  • asciidoc
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