Shear Characteristics and Strength Criterion of Frozen Joints under Different Opening Degrees
Samples of rock coupling joints were collected from the Jiangluling Tunnel of the G214 line in Qinghai province. Models with surface topographies similar to these joints were manually created. Freezing shear tests under different normal stress conditions were conducted to study the shear mechanical...
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crwiley:10.1155/2021/6636968 2024-09-15T18:11:36+00:00 Shear Characteristics and Strength Criterion of Frozen Joints under Different Opening Degrees Shen, Shiwei Gan, Lin Liu, Chang Dai, Shulin Tang, Zhi Cheng National Natural Science Foundation of China Chinese Academy of Sciences 2021 http://dx.doi.org/10.1155/2021/6636968 http://downloads.hindawi.com/journals/ace/2021/6636968.pdf http://downloads.hindawi.com/journals/ace/2021/6636968.xml https://onlinelibrary.wiley.com/doi/pdf/10.1155/2021/6636968 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Advances in Civil Engineering volume 2021, issue 1 ISSN 1687-8086 1687-8094 journal-article 2021 crwiley https://doi.org/10.1155/2021/6636968 2024-08-13T04:15:36Z Samples of rock coupling joints were collected from the Jiangluling Tunnel of the G214 line in Qinghai province. Models with surface topographies similar to these joints were manually created. Freezing shear tests under different normal stress conditions were conducted to study the shear mechanical properties of these models. On this basis, the integral form of the peak shear strength criterion of frozen joints was proposed. Results show that the shear process of the ice layer can be divided into four stages, namely, initial deformation, continuously increasing shear stress, ice shearing, and residual shear. During the continuously increasing shear stress stage, the stress‐strain curve is concave, and elastic deformation is not evident. Furthermore, the increase rate of shear stress generally rises as normal stress intensifies. In the ice shearing stage, shear stress does not decrease instantaneously, but plastic deformation is now detectable. When the opening degree is greater than the undulation difference of the joint surface under the action of all levels of normal stress, the shear stress in the ice sharply increases and drops due to local failure and reicing. Then, evident difference between the shear processes under freezing and normal temperature conditions was then obtained. On this basis, the failure forms of joint surfaces, theory of ice adhesion strength under different opening degrees and morphologies, and the shear failure forms of frozen joints under different conditions were considered. The integral form of the peak shear strength criterion of frozen joints was proposed. These results can lay a theoretical foundation for the stability analysis of rock mass engineering in permafrost areas. Article in Journal/Newspaper Ice permafrost Wiley Online Library Advances in Civil Engineering 2021 1 |
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Wiley Online Library |
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English |
description |
Samples of rock coupling joints were collected from the Jiangluling Tunnel of the G214 line in Qinghai province. Models with surface topographies similar to these joints were manually created. Freezing shear tests under different normal stress conditions were conducted to study the shear mechanical properties of these models. On this basis, the integral form of the peak shear strength criterion of frozen joints was proposed. Results show that the shear process of the ice layer can be divided into four stages, namely, initial deformation, continuously increasing shear stress, ice shearing, and residual shear. During the continuously increasing shear stress stage, the stress‐strain curve is concave, and elastic deformation is not evident. Furthermore, the increase rate of shear stress generally rises as normal stress intensifies. In the ice shearing stage, shear stress does not decrease instantaneously, but plastic deformation is now detectable. When the opening degree is greater than the undulation difference of the joint surface under the action of all levels of normal stress, the shear stress in the ice sharply increases and drops due to local failure and reicing. Then, evident difference between the shear processes under freezing and normal temperature conditions was then obtained. On this basis, the failure forms of joint surfaces, theory of ice adhesion strength under different opening degrees and morphologies, and the shear failure forms of frozen joints under different conditions were considered. The integral form of the peak shear strength criterion of frozen joints was proposed. These results can lay a theoretical foundation for the stability analysis of rock mass engineering in permafrost areas. |
author2 |
Tang, Zhi Cheng National Natural Science Foundation of China Chinese Academy of Sciences |
format |
Article in Journal/Newspaper |
author |
Shen, Shiwei Gan, Lin Liu, Chang Dai, Shulin |
spellingShingle |
Shen, Shiwei Gan, Lin Liu, Chang Dai, Shulin Shear Characteristics and Strength Criterion of Frozen Joints under Different Opening Degrees |
author_facet |
Shen, Shiwei Gan, Lin Liu, Chang Dai, Shulin |
author_sort |
Shen, Shiwei |
title |
Shear Characteristics and Strength Criterion of Frozen Joints under Different Opening Degrees |
title_short |
Shear Characteristics and Strength Criterion of Frozen Joints under Different Opening Degrees |
title_full |
Shear Characteristics and Strength Criterion of Frozen Joints under Different Opening Degrees |
title_fullStr |
Shear Characteristics and Strength Criterion of Frozen Joints under Different Opening Degrees |
title_full_unstemmed |
Shear Characteristics and Strength Criterion of Frozen Joints under Different Opening Degrees |
title_sort |
shear characteristics and strength criterion of frozen joints under different opening degrees |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1155/2021/6636968 http://downloads.hindawi.com/journals/ace/2021/6636968.pdf http://downloads.hindawi.com/journals/ace/2021/6636968.xml https://onlinelibrary.wiley.com/doi/pdf/10.1155/2021/6636968 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Advances in Civil Engineering volume 2021, issue 1 ISSN 1687-8086 1687-8094 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1155/2021/6636968 |
container_title |
Advances in Civil Engineering |
container_volume |
2021 |
container_issue |
1 |
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1810449189760401408 |