Study on Stress–Strain Relationship of Coir Fiber-Reinforced Red Clay Based on Duncan–Chang Model
Compared with other natural fibers, coir fiber has good strength characteristics and long-term anti-biodegradation ability. At present, most studies on randomly distributed coir fiber-reinforced soil have focused on cohesionless soil or granular soil. In this paper, the influence of randomly distrib...
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| Format: | Article |
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MDPI AG
2022-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/1/556 |
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| author | Xueliang Jiang Jiahui Guo Hui Yang Shufeng Bao Changping Wen Jiayu Chen |
| author_facet | Xueliang Jiang Jiahui Guo Hui Yang Shufeng Bao Changping Wen Jiayu Chen |
| author_sort | Xueliang Jiang |
| collection | DOAJ |
| description | Compared with other natural fibers, coir fiber has good strength characteristics and long-term anti-biodegradation ability. At present, most studies on randomly distributed coir fiber-reinforced soil have focused on cohesionless soil or granular soil. In this paper, the influence of randomly distributed coir fiber on the deviatoric stress and shear strength index of red clay with different fiber content was assessed by a consolidated undrained (CU) triaxial compression test. Since the hyperbolic variational character of the stress–strain relation of the samples conformed to the hyperbolic hypothesis of the Duncan–Chang model of nonlinear elastic model, the Duncan–Chang model was used to fit it, and the influences of fiber content and confining pressure on the parameters of the Duncan–Chang model were studied. The fiber content was determined by testing to be 0%, 0.2%, 0.25%, 0.3%, 0.35% and 0.4% of the dry soil mass. It has been found that coir fiber distributed in a random radial manner can significantly increase the deviatoric stress of red clay, and thus can be effectively used in the case of soil and fiber mixing. The cohesion of the red clay first increases and then decreases with the increase in fiber content, with an optimum content of 0.3%. The internal friction angle changes little with increasing fiber content. |
| first_indexed | 2024-03-11T10:07:01Z |
| format | Article |
| id | doaj.art-9c9f2b9128454d9281764f41752db66c |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T10:07:01Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj.art-9c9f2b9128454d9281764f41752db66c2023-11-16T14:58:38ZengMDPI AGApplied Sciences2076-34172022-12-0113155610.3390/app13010556Study on Stress–Strain Relationship of Coir Fiber-Reinforced Red Clay Based on Duncan–Chang ModelXueliang Jiang0Jiahui Guo1Hui Yang2Shufeng Bao3Changping Wen4Jiayu Chen5School of Civil and Engineering Management, Guangzhou Maritime University, Guangzhou 510725, ChinaSchool of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, ChinaSchool of Civil and Engineering Management, Guangzhou Maritime University, Guangzhou 510725, ChinaSchool of Civil and Engineering Management, Guangzhou Maritime University, Guangzhou 510725, ChinaSchool of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, ChinaSchool of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, ChinaCompared with other natural fibers, coir fiber has good strength characteristics and long-term anti-biodegradation ability. At present, most studies on randomly distributed coir fiber-reinforced soil have focused on cohesionless soil or granular soil. In this paper, the influence of randomly distributed coir fiber on the deviatoric stress and shear strength index of red clay with different fiber content was assessed by a consolidated undrained (CU) triaxial compression test. Since the hyperbolic variational character of the stress–strain relation of the samples conformed to the hyperbolic hypothesis of the Duncan–Chang model of nonlinear elastic model, the Duncan–Chang model was used to fit it, and the influences of fiber content and confining pressure on the parameters of the Duncan–Chang model were studied. The fiber content was determined by testing to be 0%, 0.2%, 0.25%, 0.3%, 0.35% and 0.4% of the dry soil mass. It has been found that coir fiber distributed in a random radial manner can significantly increase the deviatoric stress of red clay, and thus can be effectively used in the case of soil and fiber mixing. The cohesion of the red clay first increases and then decreases with the increase in fiber content, with an optimum content of 0.3%. The internal friction angle changes little with increasing fiber content.https://www.mdpi.com/2076-3417/13/1/556triaxial testcoir fiberstress–strain relationshipshear strengthDuncan–Chang model |
| spellingShingle | Xueliang Jiang Jiahui Guo Hui Yang Shufeng Bao Changping Wen Jiayu Chen Study on Stress–Strain Relationship of Coir Fiber-Reinforced Red Clay Based on Duncan–Chang Model Applied Sciences triaxial test coir fiber stress–strain relationship shear strength Duncan–Chang model |
| title | Study on Stress–Strain Relationship of Coir Fiber-Reinforced Red Clay Based on Duncan–Chang Model |
| title_full | Study on Stress–Strain Relationship of Coir Fiber-Reinforced Red Clay Based on Duncan–Chang Model |
| title_fullStr | Study on Stress–Strain Relationship of Coir Fiber-Reinforced Red Clay Based on Duncan–Chang Model |
| title_full_unstemmed | Study on Stress–Strain Relationship of Coir Fiber-Reinforced Red Clay Based on Duncan–Chang Model |
| title_short | Study on Stress–Strain Relationship of Coir Fiber-Reinforced Red Clay Based on Duncan–Chang Model |
| title_sort | study on stress strain relationship of coir fiber reinforced red clay based on duncan chang model |
| topic | triaxial test coir fiber stress–strain relationship shear strength Duncan–Chang model |
| url | https://www.mdpi.com/2076-3417/13/1/556 |
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