A geochemical, mineralogical and geotechnical characterization of the low plastic, highly sensitive glaciomarine clay at Dragvoll, Norway
The sediments at the NTNU research site Dragvoll, Trondheim, Norway accumulated in seawater close to the glacier front during the Pleistocene-Holocene transition. A comprehensive site investigation and laboratory test program was carried out to characterize the quick clay at Dragvoll. Downsized bloc...
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Online Access: | http://hdl.handle.net/10852/74203 http://urn.nb.no/URN:NBN:no-77286 https://doi.org/10.3934/geosci.2019.4.704 |
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ftoslouniv:oai:www.duo.uio.no:10852/74203 2023-05-15T16:22:00+02:00 A geochemical, mineralogical and geotechnical characterization of the low plastic, highly sensitive glaciomarine clay at Dragvoll, Norway Helle, Tonje Eide Aagaard, Per Nordal, Steinar Long, Michael Bazin, Sara 2019-09-06T13:31:42Z http://hdl.handle.net/10852/74203 http://urn.nb.no/URN:NBN:no-77286 https://doi.org/10.3934/geosci.2019.4.704 EN eng AIMS Press http://urn.nb.no/URN:NBN:no-77286 Helle, Tonje Eide Aagaard, Per Nordal, Steinar Long, Michael Bazin, Sara . A geochemical, mineralogical and geotechnical characterization of the low plastic, highly sensitive glaciomarine clay at Dragvoll, Norway. AIMS Geosciences. 2019, 5(4), 704-722 http://hdl.handle.net/10852/74203 1722308 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=AIMS Geosciences&rft.volume=5&rft.spage=704&rft.date=2019 AIMS Geosciences 5 4 704 722 https://doi.org/10.3934/geosci.2019.4.704 URN:NBN:no-77286 Fulltext https://www.duo.uio.no/bitstream/handle/10852/74203/1/Helle_Bazin_etal%25282019%2529.pdf Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ CC-BY 2471-2132 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2019 ftoslouniv https://doi.org/10.3934/geosci.2019.4.704 2020-06-21T08:53:55Z The sediments at the NTNU research site Dragvoll, Trondheim, Norway accumulated in seawater close to the glacier front during the Pleistocene-Holocene transition. A comprehensive site investigation and laboratory test program was carried out to characterize the quick clay at Dragvoll. Downsized block samples, mini-blocks, were extracted and tested in the laboratory. Index testing, constant rate of strain oedometer tests and anisotropically consolidated undrained compression tests were carried out on all quick-clay samples. Pore-water chemistry, bulk and clay mineralogy, cation exchange capacity and specific surface area were determined. Resistivity cone-penetration tests and electrical resistivity tomography surveys were carried out and correlated to the laboratory results. With a clay mineralogy dominated by illite and chlorite, the Dragvoll clay is electro-chemically very active. Leaching has diluted the salt content in the pore water to~0.7 g/L, corresponding to a very low soil conductivity of only 20 mS/m. Due to the low salt content and a composition of cations in the pore-water dominated by sodium (85-92%), the repulsive forces between the clay particles are large. Therefore, the clay liquefies when remolded and has a very brittle behavior. The clay is slightly overconsolidated in top, with an overconsolidation ratio decreasing towards 1 at around 6 m depth. Developing new cost-effective ground improvement methods that may also serve as landslide mitigation measures in quick-clay areas is needed. Detailed knowledge on mineralogy and geochemistry is necessary to fully understand the behavior of clays, and in developing effective ground improvement methods by chemical additives. This paper present geochemical, mineralogical and geotechnical data from the quick clay at Dragvoll. A field experiment at Dragvoll showed that potassium chloride can be used as landslide mitigation in quick-clay areas, inhibiting retrogressive landslides and reducing the risk for progressive landslides. Article in Journal/Newspaper glacier Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Norway AIMS Geosciences 5 4 704 722 |
institution |
Open Polar |
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Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
The sediments at the NTNU research site Dragvoll, Trondheim, Norway accumulated in seawater close to the glacier front during the Pleistocene-Holocene transition. A comprehensive site investigation and laboratory test program was carried out to characterize the quick clay at Dragvoll. Downsized block samples, mini-blocks, were extracted and tested in the laboratory. Index testing, constant rate of strain oedometer tests and anisotropically consolidated undrained compression tests were carried out on all quick-clay samples. Pore-water chemistry, bulk and clay mineralogy, cation exchange capacity and specific surface area were determined. Resistivity cone-penetration tests and electrical resistivity tomography surveys were carried out and correlated to the laboratory results. With a clay mineralogy dominated by illite and chlorite, the Dragvoll clay is electro-chemically very active. Leaching has diluted the salt content in the pore water to~0.7 g/L, corresponding to a very low soil conductivity of only 20 mS/m. Due to the low salt content and a composition of cations in the pore-water dominated by sodium (85-92%), the repulsive forces between the clay particles are large. Therefore, the clay liquefies when remolded and has a very brittle behavior. The clay is slightly overconsolidated in top, with an overconsolidation ratio decreasing towards 1 at around 6 m depth. Developing new cost-effective ground improvement methods that may also serve as landslide mitigation measures in quick-clay areas is needed. Detailed knowledge on mineralogy and geochemistry is necessary to fully understand the behavior of clays, and in developing effective ground improvement methods by chemical additives. This paper present geochemical, mineralogical and geotechnical data from the quick clay at Dragvoll. A field experiment at Dragvoll showed that potassium chloride can be used as landslide mitigation in quick-clay areas, inhibiting retrogressive landslides and reducing the risk for progressive landslides. |
format |
Article in Journal/Newspaper |
author |
Helle, Tonje Eide Aagaard, Per Nordal, Steinar Long, Michael Bazin, Sara |
spellingShingle |
Helle, Tonje Eide Aagaard, Per Nordal, Steinar Long, Michael Bazin, Sara A geochemical, mineralogical and geotechnical characterization of the low plastic, highly sensitive glaciomarine clay at Dragvoll, Norway |
author_facet |
Helle, Tonje Eide Aagaard, Per Nordal, Steinar Long, Michael Bazin, Sara |
author_sort |
Helle, Tonje Eide |
title |
A geochemical, mineralogical and geotechnical characterization of the low plastic, highly sensitive glaciomarine clay at Dragvoll, Norway |
title_short |
A geochemical, mineralogical and geotechnical characterization of the low plastic, highly sensitive glaciomarine clay at Dragvoll, Norway |
title_full |
A geochemical, mineralogical and geotechnical characterization of the low plastic, highly sensitive glaciomarine clay at Dragvoll, Norway |
title_fullStr |
A geochemical, mineralogical and geotechnical characterization of the low plastic, highly sensitive glaciomarine clay at Dragvoll, Norway |
title_full_unstemmed |
A geochemical, mineralogical and geotechnical characterization of the low plastic, highly sensitive glaciomarine clay at Dragvoll, Norway |
title_sort |
geochemical, mineralogical and geotechnical characterization of the low plastic, highly sensitive glaciomarine clay at dragvoll, norway |
publisher |
AIMS Press |
publishDate |
2019 |
url |
http://hdl.handle.net/10852/74203 http://urn.nb.no/URN:NBN:no-77286 https://doi.org/10.3934/geosci.2019.4.704 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
glacier |
genre_facet |
glacier |
op_source |
2471-2132 |
op_relation |
http://urn.nb.no/URN:NBN:no-77286 Helle, Tonje Eide Aagaard, Per Nordal, Steinar Long, Michael Bazin, Sara . A geochemical, mineralogical and geotechnical characterization of the low plastic, highly sensitive glaciomarine clay at Dragvoll, Norway. AIMS Geosciences. 2019, 5(4), 704-722 http://hdl.handle.net/10852/74203 1722308 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=AIMS Geosciences&rft.volume=5&rft.spage=704&rft.date=2019 AIMS Geosciences 5 4 704 722 https://doi.org/10.3934/geosci.2019.4.704 URN:NBN:no-77286 Fulltext https://www.duo.uio.no/bitstream/handle/10852/74203/1/Helle_Bazin_etal%25282019%2529.pdf |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3934/geosci.2019.4.704 |
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AIMS Geosciences |
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5 |
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4 |
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704 |
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