Subcritical crack propagation in glacial quarrying during subglacial water pressure variation
Abstract Glacial quarrying stems from the fracturing of subglacial bedrock. Much evidence shows that subcritical crack propagation of bedrock is closely related to subglacial water pressure fluctuations. Here we employ a model that assesses the impact of subglacial water pressure fluctuation on cavi...
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crcambridgeupr:10.1017/jog.2022.126 2024-09-15T18:15:37+00:00 Subcritical crack propagation in glacial quarrying during subglacial water pressure variation Li, Lin Huang, Yipeng Su, Ningchuan 2023 http://dx.doi.org/10.1017/jog.2022.126 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022001265 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 69, issue 276, page 1071-1079 ISSN 0022-1430 1727-5652 journal-article 2023 crcambridgeupr https://doi.org/10.1017/jog.2022.126 2024-08-07T04:04:45Z Abstract Glacial quarrying stems from the fracturing of subglacial bedrock. Much evidence shows that subcritical crack propagation of bedrock is closely related to subglacial water pressure fluctuations. Here we employ a model that assesses the impact of subglacial water pressure fluctuation on cavity length and subcritical crack propagation, while analyzing the effect of a pre-existing crack location using a phase-field model (PFM). Our results indicate that the cavity length is reduced during diurnal fluctuations in water pressure. There are two patterns of subcritical crack propagation on the corner of the step. The first stems from a rapid drop in water pressure. The second occurs after the water pressure recovers from the fluctuation to the initial steady state. This pattern is a consequence of enhanced stress concentration on the step since the modeled cavity length exceeds its steady value and has higher efficiency in promoting subcritical crack propagation. Additionally, based on the PFM results, we speculate that the subcritical crack initiation and propagation happen on a broader scale, including the ice-bed contact region and its adjacent region. Our findings imply that the duration of subcritical crack propagation is short and typically ceases once the cavity length adjusts to reduced water pressure levels. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 1 9 |
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Open Polar |
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Cambridge University Press |
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English |
description |
Abstract Glacial quarrying stems from the fracturing of subglacial bedrock. Much evidence shows that subcritical crack propagation of bedrock is closely related to subglacial water pressure fluctuations. Here we employ a model that assesses the impact of subglacial water pressure fluctuation on cavity length and subcritical crack propagation, while analyzing the effect of a pre-existing crack location using a phase-field model (PFM). Our results indicate that the cavity length is reduced during diurnal fluctuations in water pressure. There are two patterns of subcritical crack propagation on the corner of the step. The first stems from a rapid drop in water pressure. The second occurs after the water pressure recovers from the fluctuation to the initial steady state. This pattern is a consequence of enhanced stress concentration on the step since the modeled cavity length exceeds its steady value and has higher efficiency in promoting subcritical crack propagation. Additionally, based on the PFM results, we speculate that the subcritical crack initiation and propagation happen on a broader scale, including the ice-bed contact region and its adjacent region. Our findings imply that the duration of subcritical crack propagation is short and typically ceases once the cavity length adjusts to reduced water pressure levels. |
format |
Article in Journal/Newspaper |
author |
Li, Lin Huang, Yipeng Su, Ningchuan |
spellingShingle |
Li, Lin Huang, Yipeng Su, Ningchuan Subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
author_facet |
Li, Lin Huang, Yipeng Su, Ningchuan |
author_sort |
Li, Lin |
title |
Subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
title_short |
Subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
title_full |
Subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
title_fullStr |
Subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
title_full_unstemmed |
Subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
title_sort |
subcritical crack propagation in glacial quarrying during subglacial water pressure variation |
publisher |
Cambridge University Press (CUP) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1017/jog.2022.126 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022001265 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 69, issue 276, page 1071-1079 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2022.126 |
container_title |
Journal of Glaciology |
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1 |
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9 |
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1810453486329921536 |