Multi-effect investigation on desiccation crack evolution and mechanical behavior of swelling clay.
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| Title: | Multi-effect investigation on desiccation crack evolution and mechanical behavior of swelling clay. |
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| Authors: | Luo, Zhaogang1,2,3 (AUTHOR), Wang, Shiji1,4 (AUTHOR) shjwang@swu.edu.cn, Ou, Qiang2,3 (AUTHOR), Hamka, Muhammad Qayyum1 (AUTHOR), Li, Xian1 (AUTHOR), Xu, Chong1,5 (AUTHOR), Ding, Xuanming2,3 (AUTHOR) |
| Source: | Acta Geotechnica. Oct2023, Vol. 18 Issue 10, p5503-5518. 16p. |
| Subjects: | Interfacial friction, Fractal dimensions, Interfacial roughness, Deviatoric stress (Engineering), Clay, Surface cracks |
| Abstract: | Crack initiation and propagation of swelling clay in sustaining drying conditions are influenced by various factors such as soil size, fiber reinforcement, and interfacial friction. A series of laboratory tests were conducted to investigate the effects of soil layer size, fiber contents and interface roughness on desiccation crack evolution via using digital image technology. The crack patterns are influenced by the overall size parameter of the soil layer, the ratio of thickness to diameter (Rtd). The cracks gradually become dense and textured as the decreasing Rtd. These different crack textures originate from the differential stress accumulation and release induced by the Rtd during the drying-cracking process, and the quantitative correlations between the Rtd and crack parameters are initially established. Since the fiber reinforcement, the major crack is restricted under increased layer tensile strength. However, more cracks are generated by a noticeable tension in the shallow layer of swelling clay due to the increased rough interface in the bottom of the soils. The basic parameters of crack evolution under the effects of fiber reinforcement and interfacial friction were further analyzed including the crack area (CA), the total length of cracks (TLC), and the average width of cracks (AWC). It follows that two types of fractal dimensions were introduced to estimate the crack patterns and distribution, and the correlation between fractal dimension and surface crack ratio (Rsc) was provided based on a logarithmic mathematical model. Multiple effects on soil stress formation and release lead to different processes of crack evolution closely related to the microscopic soil–water interaction. The present findings serve as a reference for preventing geotechnical and geological disasters in swelling clay regions. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Crack initiation and propagation of swelling clay in sustaining drying conditions are influenced by various factors such as soil size, fiber reinforcement, and interfacial friction. A series of laboratory tests were conducted to investigate the effects of soil layer size, fiber contents and interface roughness on desiccation crack evolution via using digital image technology. The crack patterns are influenced by the overall size parameter of the soil layer, the ratio of thickness to diameter (Rtd). The cracks gradually become dense and textured as the decreasing Rtd. These different crack textures originate from the differential stress accumulation and release induced by the Rtd during the drying-cracking process, and the quantitative correlations between the Rtd and crack parameters are initially established. Since the fiber reinforcement, the major crack is restricted under increased layer tensile strength. However, more cracks are generated by a noticeable tension in the shallow layer of swelling clay due to the increased rough interface in the bottom of the soils. The basic parameters of crack evolution under the effects of fiber reinforcement and interfacial friction were further analyzed including the crack area (CA), the total length of cracks (TLC), and the average width of cracks (AWC). It follows that two types of fractal dimensions were introduced to estimate the crack patterns and distribution, and the correlation between fractal dimension and surface crack ratio (Rsc) was provided based on a logarithmic mathematical model. Multiple effects on soil stress formation and release lead to different processes of crack evolution closely related to the microscopic soil–water interaction. The present findings serve as a reference for preventing geotechnical and geological disasters in swelling clay regions. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 18611125 |
| DOI: | 10.1007/s11440-023-01910-8 |
