8. GEOTECHNICAL PROPERTIES OF GLACIGENIC SHELF SEDIMENTS FROM
This paper presents a geotechnical characterization of the glacigenic sediments in Prydz Bay, East Antarctica, based on the shipboard physical properties data obtained during Leg 119, combined with results of land-based analyses of 24 whole-round core samples. Main emphasis is placed on the land-bas...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.563.7430 2023-05-15T14:01:37+02:00 8. GEOTECHNICAL PROPERTIES OF GLACIGENIC SHELF SEDIMENTS FROM Prydz Bay East Antarctica Anders Solheim Carl Fredrik Forsberg Alan Pittenger The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.563.7430 http://www-odp.tamu.edu/publications/119_SR/VOLUME/CHAPTERS/sr119_08.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.563.7430 http://www-odp.tamu.edu/publications/119_SR/VOLUME/CHAPTERS/sr119_08.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www-odp.tamu.edu/publications/119_SR/VOLUME/CHAPTERS/sr119_08.pdf text ftciteseerx 2016-01-08T12:09:51Z This paper presents a geotechnical characterization of the glacigenic sediments in Prydz Bay, East Antarctica, based on the shipboard physical properties data obtained during Leg 119, combined with results of land-based analyses of 24 whole-round core samples. Main emphasis is placed on the land-based studies, which included oedometer consolidation tests, triaxial and simple shear tests for undrained shear strength, permeability tests in oedometer and triaxial cell, At-terberg limits, and grain-size analyses. The bulk of the tested sediments comprise overconsolidated diamictites of a rela-tively uniform lithology. The overconsolidation results from a combination of glacial loading and sediment overburden subsequently removed by extensive glacial erosion of the shelf. This leads to downhole profiles of physical properties that have been observed not to change as a function of the thickness of present overburden. A number of fluctuations in the parameters shows a relatively systematic trend and most likely results from changes in the proximity to the ice sheet grounding line in response to variations in the glacial regime. Very low permeabilities mainly result from high preconso-lidation stresses (Pc'). Pc ' values up to 10,000 kPa were estimated from the oedometer tests, and empirical estimates based on undrained shear strengths (up to 2500 kPa) indicate that the oedometer results are conservative. The diamicti-tes generally classify as inactive, of low to medium plasticity, and they consolidate with little deformation, even when subjected to great stresses. This is the first report of geotechnical data from deep boreholes on the Antarctic continental shelf, but material of similar character can also be expected in other areas around the Antarctic. Text Antarc* Antarctic Antarctica East Antarctica Ice Sheet Prydz Bay Unknown Antarctic The Antarctic East Antarctica Prydz Bay |
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ftciteseerx |
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description |
This paper presents a geotechnical characterization of the glacigenic sediments in Prydz Bay, East Antarctica, based on the shipboard physical properties data obtained during Leg 119, combined with results of land-based analyses of 24 whole-round core samples. Main emphasis is placed on the land-based studies, which included oedometer consolidation tests, triaxial and simple shear tests for undrained shear strength, permeability tests in oedometer and triaxial cell, At-terberg limits, and grain-size analyses. The bulk of the tested sediments comprise overconsolidated diamictites of a rela-tively uniform lithology. The overconsolidation results from a combination of glacial loading and sediment overburden subsequently removed by extensive glacial erosion of the shelf. This leads to downhole profiles of physical properties that have been observed not to change as a function of the thickness of present overburden. A number of fluctuations in the parameters shows a relatively systematic trend and most likely results from changes in the proximity to the ice sheet grounding line in response to variations in the glacial regime. Very low permeabilities mainly result from high preconso-lidation stresses (Pc'). Pc ' values up to 10,000 kPa were estimated from the oedometer tests, and empirical estimates based on undrained shear strengths (up to 2500 kPa) indicate that the oedometer results are conservative. The diamicti-tes generally classify as inactive, of low to medium plasticity, and they consolidate with little deformation, even when subjected to great stresses. This is the first report of geotechnical data from deep boreholes on the Antarctic continental shelf, but material of similar character can also be expected in other areas around the Antarctic. |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Prydz Bay East Antarctica Anders Solheim Carl Fredrik Forsberg Alan Pittenger |
spellingShingle |
Prydz Bay East Antarctica Anders Solheim Carl Fredrik Forsberg Alan Pittenger 8. GEOTECHNICAL PROPERTIES OF GLACIGENIC SHELF SEDIMENTS FROM |
author_facet |
Prydz Bay East Antarctica Anders Solheim Carl Fredrik Forsberg Alan Pittenger |
author_sort |
Prydz Bay |
title |
8. GEOTECHNICAL PROPERTIES OF GLACIGENIC SHELF SEDIMENTS FROM |
title_short |
8. GEOTECHNICAL PROPERTIES OF GLACIGENIC SHELF SEDIMENTS FROM |
title_full |
8. GEOTECHNICAL PROPERTIES OF GLACIGENIC SHELF SEDIMENTS FROM |
title_fullStr |
8. GEOTECHNICAL PROPERTIES OF GLACIGENIC SHELF SEDIMENTS FROM |
title_full_unstemmed |
8. GEOTECHNICAL PROPERTIES OF GLACIGENIC SHELF SEDIMENTS FROM |
title_sort |
8. geotechnical properties of glacigenic shelf sediments from |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.563.7430 http://www-odp.tamu.edu/publications/119_SR/VOLUME/CHAPTERS/sr119_08.pdf |
geographic |
Antarctic The Antarctic East Antarctica Prydz Bay |
geographic_facet |
Antarctic The Antarctic East Antarctica Prydz Bay |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Prydz Bay |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Prydz Bay |
op_source |
http://www-odp.tamu.edu/publications/119_SR/VOLUME/CHAPTERS/sr119_08.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.563.7430 http://www-odp.tamu.edu/publications/119_SR/VOLUME/CHAPTERS/sr119_08.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766271593980362752 |