Development of bearing capacity of fine grained permafrost deposits in western greenland urban areas subject to soil temperature changes

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2012

Standard

Development of bearing capacity of fine grained permafrost deposits in western greenland urban areas subject to soil temperature changes. / Agergaard, Frederik Ancker; Ingeman-Nielsen, Thomas.

Cold Regions Engineering 2012 : Sustainable Infrastructure Development in a Changing Cold Environment. American Society of Civil Engineers, 2012. p. 82-92.

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2012

Harvard

Agergaard, FA & Ingeman-Nielsen, T 2012, 'Development of bearing capacity of fine grained permafrost deposits in western greenland urban areas subject to soil temperature changes'. in Cold Regions Engineering 2012 : Sustainable Infrastructure Development in a Changing Cold Environment. American Society of Civil Engineers, pp. 82-92., 10.1061/9780784412473.009

APA

Agergaard, F. A., & Ingeman-Nielsen, T. (2012). Development of bearing capacity of fine grained permafrost deposits in western greenland urban areas subject to soil temperature changes. In Cold Regions Engineering 2012 : Sustainable Infrastructure Development in a Changing Cold Environment. (pp. 82-92). American Society of Civil Engineers. 10.1061/9780784412473.009

CBE

Agergaard FA, Ingeman-Nielsen T. 2012. Development of bearing capacity of fine grained permafrost deposits in western greenland urban areas subject to soil temperature changes. In Cold Regions Engineering 2012 : Sustainable Infrastructure Development in a Changing Cold Environment. American Society of Civil Engineers. pp. 82-92. Available from: 10.1061/9780784412473.009

MLA

Agergaard, Frederik Ancker and Thomas Ingeman-Nielsen "Development of bearing capacity of fine grained permafrost deposits in western greenland urban areas subject to soil temperature changes". Cold Regions Engineering 2012 : Sustainable Infrastructure Development in a Changing Cold Environment. American Society of Civil Engineers. 2012. 82-92. Available: 10.1061/9780784412473.009

Vancouver

Agergaard FA, Ingeman-Nielsen T. Development of bearing capacity of fine grained permafrost deposits in western greenland urban areas subject to soil temperature changes. In Cold Regions Engineering 2012 : Sustainable Infrastructure Development in a Changing Cold Environment. American Society of Civil Engineers. 2012. p. 82-92. Available from: 10.1061/9780784412473.009

Author

Agergaard, Frederik Ancker; Ingeman-Nielsen, Thomas / Development of bearing capacity of fine grained permafrost deposits in western greenland urban areas subject to soil temperature changes.

Cold Regions Engineering 2012 : Sustainable Infrastructure Development in a Changing Cold Environment. American Society of Civil Engineers, 2012. p. 82-92.

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2012

Bibtex

@inbook{7bd248e15aa44d4e9bb428d9432fc782,
title = "Development of bearing capacity of fine grained permafrost deposits in western greenland urban areas subject to soil temperature changes",
keywords = "Permafrost, Triaxial testing, Silty clay, Unfrozen water content, climate change",
publisher = "American Society of Civil Engineers",
author = "Agergaard, {Frederik Ancker} and Thomas Ingeman-Nielsen",
year = "2012",
doi = "10.1061/9780784412473.009",
isbn = "9780784412473",
pages = "82-92",
booktitle = "Cold Regions Engineering 2012",

}

RIS

TY - GEN

T1 - Development of bearing capacity of fine grained permafrost deposits in western greenland urban areas subject to soil temperature changes

A1 - Agergaard,Frederik Ancker

A1 - Ingeman-Nielsen,Thomas

AU - Agergaard,Frederik Ancker

AU - Ingeman-Nielsen,Thomas

PB - American Society of Civil Engineers

PY - 2012

Y1 - 2012

N2 - The bearing capacity of frozen soils is high, compared to non-frozen soils of same composition. Projected climatic warming in the Arctic will increase the soil temperature, thus affecting the bearing capacity and the deformation properties. Western Greenland temperatures are projected to increase by 2-3 °C during the 21st century. This paper presents a relation between undrained shear strength and temperature based on a series triaxial tests of fine-grained permafrost in the interval from -3 °C to -1 °C. Moderately ice-rich permafrost and excess ice free refrozen active-layer were retrieved from the Western Greenland towns of Sisimiut and Ilulissat respectively. Tests reveal undrained shear strengths ranging from 409 kPa to 940 kPa, where low temperatures and low excess ice content yield higher strengths. Normalized strengths are used for establishing a trend for the strength decrease with increasing temperature. Both excess ice free and moderately ice-rich samples show a strength decrease of 21 %/°C from -3 °C to -1 °C. Other authors’ data suggest the same trend for moderately ice-rich samples, whereas it is suggested that further studies are conducted to validate the trend for excess ice free samples. Unfrozen water contents are seen to be directly inversely proportional to the undrained shear strength when both are normalized, which may reduce costs for establishing reliable soil strength parameters. It is suggested that a relation to deformation parameters are investigated as well. The established trends could provide a valuable tool for foundation design in fine-grained permafrost areas.

AB - The bearing capacity of frozen soils is high, compared to non-frozen soils of same composition. Projected climatic warming in the Arctic will increase the soil temperature, thus affecting the bearing capacity and the deformation properties. Western Greenland temperatures are projected to increase by 2-3 °C during the 21st century. This paper presents a relation between undrained shear strength and temperature based on a series triaxial tests of fine-grained permafrost in the interval from -3 °C to -1 °C. Moderately ice-rich permafrost and excess ice free refrozen active-layer were retrieved from the Western Greenland towns of Sisimiut and Ilulissat respectively. Tests reveal undrained shear strengths ranging from 409 kPa to 940 kPa, where low temperatures and low excess ice content yield higher strengths. Normalized strengths are used for establishing a trend for the strength decrease with increasing temperature. Both excess ice free and moderately ice-rich samples show a strength decrease of 21 %/°C from -3 °C to -1 °C. Other authors’ data suggest the same trend for moderately ice-rich samples, whereas it is suggested that further studies are conducted to validate the trend for excess ice free samples. Unfrozen water contents are seen to be directly inversely proportional to the undrained shear strength when both are normalized, which may reduce costs for establishing reliable soil strength parameters. It is suggested that a relation to deformation parameters are investigated as well. The established trends could provide a valuable tool for foundation design in fine-grained permafrost areas.

KW - Permafrost

KW - Triaxial testing

KW - Silty clay

KW - Unfrozen water content

KW - climate change

U2 - 10.1061/9780784412473.009

DO - 10.1061/9780784412473.009

SN - 9780784412473

BT - Cold Regions Engineering 2012

T2 - Cold Regions Engineering 2012

SP - 82

EP - 92

ER -