Effects of dry-wet cycles on three-dimensional pore structure and permeability characteristics of granite residual soil using X-ray micro computed tomography
文献类型：期刊论文
| 作者 | An, Ran1,2; Kong, Lingwei3; Zhang, Xianwei3; Li, Chengsheng3 |
| 刊名 | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
 |
| 出版日期 | 2022-06-01 |
| 卷号 | 14期号:3页码:851 |
| ISSN号 | 1674-7755 |
| 关键词 | Granite residual soil Dry-wet cycle X-ray micro computed tomography (micro-CT) Three-dimensional (3D) pore distribution Seepage simulations Permeability |
| 英文摘要 | Due to seasonal climate alterations, the microstructure and permeability of granite residual soil are easily affected by multiple dry-wet cycles. The X-ray micro computed tomography (micro-CT) acted as a non-destructive tool for characterizing the microstructure of soil samples exposed to a range of damage levels induced by dry-wet cycles. Subsequently, the variations of pore distribution and permeability due to drywet cycling effects were revealed based on three-dimensional (3D) pore distribution analysis and seepage simulations. According to the results, granite residual soils could be separated into four different components, namely, pores, clay, quartz, and hematite, from micro-CT images. The reconstructed 3D pore models dynamically demonstrated the expanding and connecting patterns of pore structures during drywet cycles. The values of porosity and connectivity are positively correlated with the number of dry-wet cycles, which were expressed by exponential and linear functions, respectively. The pore volume probability distribution curves of granite residual soil coincide with the chi(2) distribution curve, which verifies the effectiveness of the assumption of chi(2) distribution probability. The pore volume distribution curves suggest that the pores in soils were divided into four types based on their volumes, i.e. micropores, mesopores, macropores, and cracks. From a quantitative and visual perspective, considerable small pores are gradually transformed into cracks with a large volume and a high connectivity. Under the action of dry-wet cycles, the number of seepage flow streamlines which contribute to water permeation in seepage simulation increases distinctly, as well as the permeability and hydraulic conductivity. The calculated hydraulic conductivity is comparable with measured ones with an acceptable error margin in general, verifying the accuracy of seepage simulations based on micro-CT results. (C) 2022 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. All rights reserved. |
| 学科主题 | Engineering |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000799668500015 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35225]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, China 2.College of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China 3.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China |
| 推荐引用方式 GB/T 7714 | An, Ran,Kong, Lingwei,Zhang, Xianwei,et al. Effects of dry-wet cycles on three-dimensional pore structure and permeability characteristics of granite residual soil using X-ray micro computed tomography[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2022,14(3):851. |
| APA | An, Ran,Kong, Lingwei,Zhang, Xianwei,&Li, Chengsheng.(2022).Effects of dry-wet cycles on three-dimensional pore structure and permeability characteristics of granite residual soil using X-ray micro computed tomography.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,14(3),851. |
| MLA | An, Ran,et al."Effects of dry-wet cycles on three-dimensional pore structure and permeability characteristics of granite residual soil using X-ray micro computed tomography".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 14.3(2022):851. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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