Indentation Tests to Investigate Ice Pressures on Vertical Piers
Abstract Controlled field and laboratory tests were performed to investigate the relationship between ice strength and the maximum ice pressures on vertical piers. The apparatus used in the field tests consisted of a flat indentor (75 cm wide) which was pushed through the ice by hydraulic rams. 27 t...
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Language: | English |
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Cambridge University Press (CUP)
1977
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Online Access: | http://dx.doi.org/10.1017/s0022143000029361 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000029361 |
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crcambridgeupr:10.1017/s0022143000029361 2024-03-03T08:46:00+00:00 Indentation Tests to Investigate Ice Pressures on Vertical Piers Croasdale, K. R. Morgenstern, N. R. Nuttall, J. B. 1977 http://dx.doi.org/10.1017/s0022143000029361 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000029361 en eng Cambridge University Press (CUP) Journal of Glaciology volume 19, issue 81, page 301-312 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1977 crcambridgeupr https://doi.org/10.1017/s0022143000029361 2024-02-08T08:40:23Z Abstract Controlled field and laboratory tests were performed to investigate the relationship between ice strength and the maximum ice pressures on vertical piers. The apparatus used in the field tests consisted of a flat indentor (75 cm wide) which was pushed through the ice by hydraulic rams. 27 tests were conducted on lake ice up to one metre thick. Ice pressures in the range 2.5 to 5.0 MPa were obtained for ice in good initial contact with the indentor. The ice pressures exhibited little sensitivity to variations in temperature, ice thickness and strain-rate for the range 7.5 × 10 -7 to 4.4 × 10 -3 s -1 . The average unconfined compressive strengths obtained in the laboratory were about 20% higher than the average field ice pressures. In addition, the laboratory strengths were found to be sensitive to temperature, and to strain-rate in the range 1 × 10 -7 to 1 × 10 -3 s -1 . The confined compressive strength was two to three times the unconfined strength. The failure modes observed in the indentation tests were similar to those predicted (before the tests) by an upper-bound plasticity model. The ability of the model to relate small-scale ice strength to field ice pressures is discussed. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 19 81 301 312 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Croasdale, K. R. Morgenstern, N. R. Nuttall, J. B. Indentation Tests to Investigate Ice Pressures on Vertical Piers |
topic_facet |
Earth-Surface Processes |
description |
Abstract Controlled field and laboratory tests were performed to investigate the relationship between ice strength and the maximum ice pressures on vertical piers. The apparatus used in the field tests consisted of a flat indentor (75 cm wide) which was pushed through the ice by hydraulic rams. 27 tests were conducted on lake ice up to one metre thick. Ice pressures in the range 2.5 to 5.0 MPa were obtained for ice in good initial contact with the indentor. The ice pressures exhibited little sensitivity to variations in temperature, ice thickness and strain-rate for the range 7.5 × 10 -7 to 4.4 × 10 -3 s -1 . The average unconfined compressive strengths obtained in the laboratory were about 20% higher than the average field ice pressures. In addition, the laboratory strengths were found to be sensitive to temperature, and to strain-rate in the range 1 × 10 -7 to 1 × 10 -3 s -1 . The confined compressive strength was two to three times the unconfined strength. The failure modes observed in the indentation tests were similar to those predicted (before the tests) by an upper-bound plasticity model. The ability of the model to relate small-scale ice strength to field ice pressures is discussed. |
format |
Article in Journal/Newspaper |
author |
Croasdale, K. R. Morgenstern, N. R. Nuttall, J. B. |
author_facet |
Croasdale, K. R. Morgenstern, N. R. Nuttall, J. B. |
author_sort |
Croasdale, K. R. |
title |
Indentation Tests to Investigate Ice Pressures on Vertical Piers |
title_short |
Indentation Tests to Investigate Ice Pressures on Vertical Piers |
title_full |
Indentation Tests to Investigate Ice Pressures on Vertical Piers |
title_fullStr |
Indentation Tests to Investigate Ice Pressures on Vertical Piers |
title_full_unstemmed |
Indentation Tests to Investigate Ice Pressures on Vertical Piers |
title_sort |
indentation tests to investigate ice pressures on vertical piers |
publisher |
Cambridge University Press (CUP) |
publishDate |
1977 |
url |
http://dx.doi.org/10.1017/s0022143000029361 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000029361 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 19, issue 81, page 301-312 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000029361 |
container_title |
Journal of Glaciology |
container_volume |
19 |
container_issue |
81 |
container_start_page |
301 |
op_container_end_page |
312 |
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1792501785067257856 |