Resistivity monitoring for leakage and internal erosion detection at Hallby embankment dam

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Sjodahl, P. (author)

Resistivity monitoring for leakage and internal erosion detection at Hallby embankment dam

Article/chapterEnglish2008

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Elsevier BV,2008
electronicrdacarrier

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LIBRIS-ID:oai:lup.lub.lu.se:3c7f1518-d116-4937-b829-d6d296ddb5dc
https://lup.lub.lu.se/record/1284655URI
https://doi.org/10.1016/j.jappgeo.2008.07.003DOI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:art swepub-publicationtype
Subject category:ref swepub-contenttype

Notes

Internal erosion is one of the major reasons for embankment dam failures. Despite this, the knowledge of the temporal development of internal erosion in full scale structures is limited. Detection of internal erosion is complicated using conventional methods, and new or improved methods are appreciated. Hallby was the first Swedish embankment to get a permanently installed monitoring system intended for resistivity measurements. Daily measurements started to take place already in late 1996, which make these long term monitoring data unique. This paper includes examples of long term time series from Hallby along with some evaluation and interpretation techniques used when analysing such monitoring data. Time-lapse inversion was used to focus the variation over time and suppress artefacts due to the resistivity structure. Seasonal resistivity variations inside the dam are obvious. Increasing long term resistivity has been noticed in a particular zone in the left embankment. This zone also exhibits larger seasonal variations relative to other parts of the dam, and the variations are increasing. The observations may relate to an ongoing internal erosion process in the dam. The long term change may be indicative of a change in material properties, and the large and increasing variations may reflect higher and increasing seepage levels. In the years 2004 to 2006 the dam was upgraded and the resistivity system reinstalled. The results indicate that resistivity monitoring may have a chance of detecting development of internal erosion at an early stage. (C) 2008 Published by Elsevier B.V.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Samhällsbyggnadsteknik Geoteknik hsv//swe
ENGINEERING AND TECHNOLOGY Civil Engineering Geotechnical Engineering hsv//eng
Embankment dam
Monitoring
Resistivity
Time-lapse inversion
Leakage

Added entries (persons, corporate bodies, meetings, titles ...)

Dahlin, TorleifLund University,Lunds universitet,Teknisk geologi,Institutionen för biomedicinsk teknik,Institutioner vid LTH,Lunds Tekniska Högskola,Engineering Geology,Department of Biomedical Engineering,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)tg-tda (author)
Johansson, S. (author)
Loke, M. H. (author)
Teknisk geologiInstitutionen för biomedicinsk teknik (creator_code:org_t)

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In:Journal of Applied Geophysics: Elsevier BV65:3-4, s. 155-1640926-9851

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By the author/editor: Sjodahl, P.; Dahlin, Torleif; Johansson, S.; Loke, M. H.

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Civil Engineerin ...; and Geotechnical Eng ...

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