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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ftdoajarticles:oai:doaj.org/article:71cdcdca8c2445d193f67c288423ceac 2024-09-15T18:11:36+00:00 Shear Characteristics and Strength Criterion of Frozen Joints under Different Opening Degrees Shiwei Shen Lin Gan Chang Liu Shulin Dai 2021-01-01T00:00:00Z https://doi.org/10.1155/2021/6636968 https://doaj.org/article/71cdcdca8c2445d193f67c288423ceac EN eng Wiley http://dx.doi.org/10.1155/2021/6636968 https://doaj.org/toc/1687-8086 https://doaj.org/toc/1687-8094 1687-8086 1687-8094 doi:10.1155/2021/6636968 https://doaj.org/article/71cdcdca8c2445d193f67c288423ceac Advances in Civil Engineering, Vol 2021 (2021) Engineering (General). Civil engineering (General) TA1-2040 article 2021 ftdoajarticles https://doi.org/10.1155/2021/6636968 2024-08-05T17:48:39Z 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 Directory of Open Access Journals: DOAJ Articles Advances in Civil Engineering 2021 1 13 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Engineering (General). Civil engineering (General) TA1-2040 |
spellingShingle |
Engineering (General). Civil engineering (General) TA1-2040 Shiwei Shen Lin Gan Chang Liu Shulin Dai Shear Characteristics and Strength Criterion of Frozen Joints under Different Opening Degrees |
topic_facet |
Engineering (General). Civil engineering (General) TA1-2040 |
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. |
format |
Article in Journal/Newspaper |
author |
Shiwei Shen Lin Gan Chang Liu Shulin Dai |
author_facet |
Shiwei Shen Lin Gan Chang Liu Shulin Dai |
author_sort |
Shiwei Shen |
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 |
https://doi.org/10.1155/2021/6636968 https://doaj.org/article/71cdcdca8c2445d193f67c288423ceac |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Advances in Civil Engineering, Vol 2021 (2021) |
op_relation |
http://dx.doi.org/10.1155/2021/6636968 https://doaj.org/toc/1687-8086 https://doaj.org/toc/1687-8094 1687-8086 1687-8094 doi:10.1155/2021/6636968 https://doaj.org/article/71cdcdca8c2445d193f67c288423ceac |
op_doi |
https://doi.org/10.1155/2021/6636968 |
container_title |
Advances in Civil Engineering |
container_volume |
2021 |
container_start_page |
1 |
op_container_end_page |
13 |
_version_ |
1810449195683807232 |