دورية أكاديمية
Shear Strength and Microstructure of Intact Loess Subjected to Freeze-Thaw Cycling
| العنوان: | Shear Strength and Microstructure of Intact Loess Subjected to Freeze-Thaw Cycling |
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| المؤلفون: | Kuan Liu, Wanjun Ye, Hongjun Jing |
| المصدر: | Advances in Materials Science and Engineering, Vol 2021 (2021) |
| بيانات النشر: | Wiley, 2021. |
| سنة النشر: | 2021 |
| المجموعة: | LCC:Materials of engineering and construction. Mechanics of materials |
| مصطلحات موضوعية: | Materials of engineering and construction. Mechanics of materials, TA401-492 |
| الوصف: | In the Loess Plateau, seasonal freeze and thaw cause great damage to the mechanical behavior and microstructure of soil, which leads to frequent geological disasters during winter and spring. To investigate the influence of freeze-thaw (FT) cycling (FTC) on the shear strength and microstructure of intact loess, triaxial shear, nuclear magnetic resonance, and scanning electron microscope tests were carried out on soil samples after target FT cycles. The results indicate that the FTC has limited changes to the soil stress-strain curve, but has a significant attenuation effect on the peak deviatoric stress. The peak deviatoric stress was attenuated by FTC but changed insignificantly after ten cycles. The cohesive force decays exponentially with the number of FT cycles, while the internal friction angle increases slightly. Moreover, under FTC, the T2 hydrogen spectra of soil samples showed a multimodal distribution, with the main peak appearing to have two obvious upward shifts that occurred at 6 and 10 FT cycles. Indeed, a depolarization phenomenon related to the directional frequency of soil particles was observed, and the mass fractal dimension of the pore network increased slightly. In an FT environment, the shear strength declines due to accumulated internal microstructural damage. These findings contribute to a better understanding of the response of loess to FTC and provide novel ideas for the prevention of frost damage in loess areas. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1687-8434 1687-8442 |
| Relation: | https://doaj.org/toc/1687-8434; https://doaj.org/toc/1687-8442 |
| DOI: | 10.1155/2021/1173603 |
| URL الوصول: | https://doaj.org/article/f6ff7e33b2454564ab39478502ed31a5 |
| رقم الأكسشن: | edsdoj.f6ff7e33b2454564ab39478502ed31a5 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 16878434 16878442 |
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| DOI: | 10.1155/2021/1173603 |