Evolution of cracks in the shear bands of granite residual soil
The evolution of shear bands and cracks plays an important role in landslides. However, there is no systematic method for classification of the cracks, which can be used to analyze the evolution of cracks in shear bands. In this study, X-ray computed tomography (CT) is used to observe the behavior o...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S167477552200097X |
| _version_ | 1828097303014014976 |
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| author | Chengsheng Li Lingwei Kong Ran An |
| author_facet | Chengsheng Li Lingwei Kong Ran An |
| author_sort | Chengsheng Li |
| collection | DOAJ |
| description | The evolution of shear bands and cracks plays an important role in landslides. However, there is no systematic method for classification of the cracks, which can be used to analyze the evolution of cracks in shear bands. In this study, X-ray computed tomography (CT) is used to observe the behavior of granite residual soil during a triaxial shear process. Based on the digital volume correlation (DVC) method, a crack classification method is established according to the connectivity characteristics of cracks before and after loading. Cracks are then divided into six classes: obsolete, brand-new, isolated, split, combined, and compound. With evolution of the shear bands, a large number of brand-new cracks accelerate the damages of materials at the mesoscale, resulting in a sharp decrease in strength. The volume of brand-new cracks increases rapidly with increasing axial strain, and their volume is greater than 50% when the strain reaches 12%, while the volume of compound cracks decreases from 54% to 21%. As cracks are the weakest areas in a material, brand-new cracks accelerate the development of shear bands. Finally, the coupling effect of shear bands and cracks destroys the soil strength. |
| first_indexed | 2024-04-11T07:44:21Z |
| format | Article |
| id | doaj.art-cb9692e9015d4b108d68d5a841a29cc7 |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-04-11T07:44:21Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-cb9692e9015d4b108d68d5a841a29cc72022-12-22T04:36:21ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552022-12-0114619561966Evolution of cracks in the shear bands of granite residual soilChengsheng Li0Lingwei Kong1Ran An2Department of Civil and Environmental Engineering, Shantou University, Shantou, 515063, China; State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; Corresponding author. Department of Civil and Environmental Engineering, Shantou University, Shantou, 515063, China.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; College of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, ChinaThe evolution of shear bands and cracks plays an important role in landslides. However, there is no systematic method for classification of the cracks, which can be used to analyze the evolution of cracks in shear bands. In this study, X-ray computed tomography (CT) is used to observe the behavior of granite residual soil during a triaxial shear process. Based on the digital volume correlation (DVC) method, a crack classification method is established according to the connectivity characteristics of cracks before and after loading. Cracks are then divided into six classes: obsolete, brand-new, isolated, split, combined, and compound. With evolution of the shear bands, a large number of brand-new cracks accelerate the damages of materials at the mesoscale, resulting in a sharp decrease in strength. The volume of brand-new cracks increases rapidly with increasing axial strain, and their volume is greater than 50% when the strain reaches 12%, while the volume of compound cracks decreases from 54% to 21%. As cracks are the weakest areas in a material, brand-new cracks accelerate the development of shear bands. Finally, the coupling effect of shear bands and cracks destroys the soil strength.http://www.sciencedirect.com/science/article/pii/S167477552200097XShear bandCrack classification methodDigital volume correlation (DVC)X-ray computed tomography (CT)Granite residual soil |
| spellingShingle | Chengsheng Li Lingwei Kong Ran An Evolution of cracks in the shear bands of granite residual soil Journal of Rock Mechanics and Geotechnical Engineering Shear band Crack classification method Digital volume correlation (DVC) X-ray computed tomography (CT) Granite residual soil |
| title | Evolution of cracks in the shear bands of granite residual soil |
| title_full | Evolution of cracks in the shear bands of granite residual soil |
| title_fullStr | Evolution of cracks in the shear bands of granite residual soil |
| title_full_unstemmed | Evolution of cracks in the shear bands of granite residual soil |
| title_short | Evolution of cracks in the shear bands of granite residual soil |
| title_sort | evolution of cracks in the shear bands of granite residual soil |
| topic | Shear band Crack classification method Digital volume correlation (DVC) X-ray computed tomography (CT) Granite residual soil |
| url | http://www.sciencedirect.com/science/article/pii/S167477552200097X |
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