Behavior of Circular Footings and Plate Anchors Embedded in Permafrost
The purpose of this paper is to develop a method for predicting the creep settlement and the bearing capacity of frozen soils under deep circular loads. The theory uses experimentally determined creep parameters of frozen soil and is intended to be applicable to the design of deep circular footings...
Published in: | Canadian Geotechnical Journal |
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Canadian Science Publishing
1974
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crcansciencepubl:10.1139/t74-057 2024-09-15T18:29:50+00:00 Behavior of Circular Footings and Plate Anchors Embedded in Permafrost Ladanyi, B. Johnston, G. H. 1974 http://dx.doi.org/10.1139/t74-057 http://www.nrcresearchpress.com/doi/pdf/10.1139/t74-057 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Geotechnical Journal volume 11, issue 4, page 531-553 ISSN 0008-3674 1208-6010 journal-article 1974 crcansciencepubl https://doi.org/10.1139/t74-057 2024-06-27T04:10:58Z The purpose of this paper is to develop a method for predicting the creep settlement and the bearing capacity of frozen soils under deep circular loads. The theory uses experimentally determined creep parameters of frozen soil and is intended to be applicable to the design of deep circular footings and screw anchors embedded in permafrost soils. On the basis of available experimental evidence, it was concluded that a mathematical model different from that usual in soil mechanics should be used in solving the time-dependent bearing capacity problem of such footings. The solution proposed in the paper was obtained by using the mathematical model of an expanding spherical cavity in a nonlinear viscoelastic-plastic medium with time, temperature, and normal pressure dependent strength properties. For a given footing or anchor, the theory furnishes either isochronous load-displacement curves, or load-creep rate curves, or a time-dependent bearing capacity for which formulas and graphs of nonlinear elastic-plastic bearing capacity factors are supplied.The theoretical predictability of creep rates and ultimate failure loads was checked against the results of screw anchor tests carried out by the Division of Building Research, N.R.C.C., at a permafrost site in Thompson, Manitoba. It was found that the use in the theory of the creep parameters determined by creep-pressuremeter tests performed at the site, resulted in a satisfactory agreement between the predicted and the observed behavior. Article in Journal/Newspaper permafrost Canadian Science Publishing Canadian Geotechnical Journal 11 4 531 553 |
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Open Polar |
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Canadian Science Publishing |
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English |
description |
The purpose of this paper is to develop a method for predicting the creep settlement and the bearing capacity of frozen soils under deep circular loads. The theory uses experimentally determined creep parameters of frozen soil and is intended to be applicable to the design of deep circular footings and screw anchors embedded in permafrost soils. On the basis of available experimental evidence, it was concluded that a mathematical model different from that usual in soil mechanics should be used in solving the time-dependent bearing capacity problem of such footings. The solution proposed in the paper was obtained by using the mathematical model of an expanding spherical cavity in a nonlinear viscoelastic-plastic medium with time, temperature, and normal pressure dependent strength properties. For a given footing or anchor, the theory furnishes either isochronous load-displacement curves, or load-creep rate curves, or a time-dependent bearing capacity for which formulas and graphs of nonlinear elastic-plastic bearing capacity factors are supplied.The theoretical predictability of creep rates and ultimate failure loads was checked against the results of screw anchor tests carried out by the Division of Building Research, N.R.C.C., at a permafrost site in Thompson, Manitoba. It was found that the use in the theory of the creep parameters determined by creep-pressuremeter tests performed at the site, resulted in a satisfactory agreement between the predicted and the observed behavior. |
format |
Article in Journal/Newspaper |
author |
Ladanyi, B. Johnston, G. H. |
spellingShingle |
Ladanyi, B. Johnston, G. H. Behavior of Circular Footings and Plate Anchors Embedded in Permafrost |
author_facet |
Ladanyi, B. Johnston, G. H. |
author_sort |
Ladanyi, B. |
title |
Behavior of Circular Footings and Plate Anchors Embedded in Permafrost |
title_short |
Behavior of Circular Footings and Plate Anchors Embedded in Permafrost |
title_full |
Behavior of Circular Footings and Plate Anchors Embedded in Permafrost |
title_fullStr |
Behavior of Circular Footings and Plate Anchors Embedded in Permafrost |
title_full_unstemmed |
Behavior of Circular Footings and Plate Anchors Embedded in Permafrost |
title_sort |
behavior of circular footings and plate anchors embedded in permafrost |
publisher |
Canadian Science Publishing |
publishDate |
1974 |
url |
http://dx.doi.org/10.1139/t74-057 http://www.nrcresearchpress.com/doi/pdf/10.1139/t74-057 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Canadian Geotechnical Journal volume 11, issue 4, page 531-553 ISSN 0008-3674 1208-6010 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/t74-057 |
container_title |
Canadian Geotechnical Journal |
container_volume |
11 |
container_issue |
4 |
container_start_page |
531 |
op_container_end_page |
553 |
_version_ |
1810471290517061632 |