Investigation of cracking behavior of fine-grained clays exposed to different humidity environments and engineering implications based on X-ray computed tomography
文献类型：期刊论文
| 作者 | Zhou, Zhenhua1,3; Xue, Quan2 |
| 刊名 | CONSTRUCTION AND BUILDING MATERIALS
 |
| 出版日期 | 2024-11-08 |
| 卷号 | 450页码:15 |
| 关键词 | Fine-grained clay Cracking behavior Humidity environment X-ray computed tomography Engineering implication |
| ISSN号 | 0950-0618 |
| DOI | 10.1016/j.conbuildmat.2024.138643 |
| 英文摘要 | Due to the humidity difference between fine-grained clay and atmosphere environment, the complex crack network is formed, which is the main channel for water storage and migration and hence poses a potential threat to engineering construction. Therefore, the appropriate characterization of cracking behavior of fine-grained clay is of great significance for exploring its microphysical properties. To this end, this work took expansive soils as research object and a series of desiccation tests and X-ray computed tomography tests were conducted to investigate the shrinkage cracking behavior. The results indicate that a higher desiccation rate records a smaller shrinkage strain, but it aggravates the cracking on a much larger scale. Especially at high desiccation rates, twodimensional crack ratio shows a significant fluctuation. Small cracks tend to turn into large ones during desiccation, and the increasing desiccation rate primarily exerts a significant effect on the cracks with equivalent radius more than 1000 mu m. The expansive soil is dominated by horizontal cracks, and a low desiccation rate mainly promotes the connection between horizontal cracks, whereas high desiccation rates enhance the connectivity of oblique cracks, which exerts an adverse effect on soil slopes. Besides, the rise in desiccation rate leads to a wealth of micro-scale pores and throats occurring in the soil. The fine-grained clays at higher desiccation rates present larger pore and throat volume, more connected pores, and higher average coordination number, thus enhancing the connectivity between pore and pore. Permeability simulation results also confirm the positive correlation between connected crack ratio and hydraulic conductivity of the soil. In terms of engineering significance, narrowing down the difference in humidity between fine-grained clays and atmosphere is the most effective measure to constrain the extension of cracks. |
| WOS研究方向 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:001335569700001 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/42838]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Xue, Quan |
| 作者单位 | 1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Shaanxi, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, Zhenhua,Xue, Quan. Investigation of cracking behavior of fine-grained clays exposed to different humidity environments and engineering implications based on X-ray computed tomography[J]. CONSTRUCTION AND BUILDING MATERIALS,2024,450:15. |
| APA | Zhou, Zhenhua,&Xue, Quan.(2024).Investigation of cracking behavior of fine-grained clays exposed to different humidity environments and engineering implications based on X-ray computed tomography.CONSTRUCTION AND BUILDING MATERIALS,450,15. |
| MLA | Zhou, Zhenhua,et al."Investigation of cracking behavior of fine-grained clays exposed to different humidity environments and engineering implications based on X-ray computed tomography".CONSTRUCTION AND BUILDING MATERIALS 450(2024):15. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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