Drying-wetting impacts on granite residual soil: a multi-scale study from macroscopic to microscopic investigations
文献类型：期刊论文
| 作者 | An, Ran; Zhang, Xianwei; Kong, Lingwei; Liu, Xinyu; Chen, Chang |
| 刊名 | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
 |
| 出版日期 | 2022-10-01 |
| 卷号 | 81期号:10 |
| 关键词 | Drying-wetting cycles Granite residual soil Shear strength Cracks Pore-size distribution Microstructure |
| ISSN号 | 1435-9529 |
| 英文摘要 | Granite residual soil (GRS) is sensitive to variations in humidity and regularly experiences wetting-drying (D-W) cycles in naturally seasonal climates. It is therefore necessary to explore the effects of D-W cycles on the basic properties of GRS for both engineering safety and scientific research. Triaxial shear tests, computed tomography, nuclear magnetic resonance, and scanning electron microscopy were performed to study the mechanical behavior and structural damage of GRS samples from 0 to 8 D-W cycles. The failure stress, cohesion, and internal friction angle of the GRS samples decreased to different extents with an increase in the number of D-W cycles. The cohesion and internal friction angle of the GRS decreased from 55.95 to 26.93 kPa and 23.28 degrees to 22.65 degrees after eight D-W cycles. Based on computed tomography, the development of mesoscopic cracks can be divided into a crack-generating stage (0-1 D-W cycles), a crack-propagating stage (2-5 D-W cycles), and a crack-stable stage (> 5 D-W cycles). Pore volume distribution curves showed that the pores could be classified into three types (micropores, mesopores, and macropores). The proportion of micropores and mesopores decreased with an increase in the number of D-W cycles, whereas the proportions of macropores and fractures increased. The microstructure in clay particles gradually disintegrated and the pores increased in size and formed connected fractures. The deterioration in the macroscopic mechanical properties of the GRS is the external manifestation of irreversible damage to its microscopic and mesoscopic structure due to the effects of D-W cycles. |
| 学科主题 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000859908900004 |
| 出版者 | SPRINGER HEIDELBERG |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34855]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS; 2.Wuhan University of Science & Technology |
| 推荐引用方式 GB/T 7714 | An, Ran,Zhang, Xianwei,Kong, Lingwei,et al. Drying-wetting impacts on granite residual soil: a multi-scale study from macroscopic to microscopic investigations[J]. BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,2022,81(10). |
| APA | An, Ran,Zhang, Xianwei,Kong, Lingwei,Liu, Xinyu,&Chen, Chang.(2022).Drying-wetting impacts on granite residual soil: a multi-scale study from macroscopic to microscopic investigations.BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,81(10). |
| MLA | An, Ran,et al."Drying-wetting impacts on granite residual soil: a multi-scale study from macroscopic to microscopic investigations".BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 81.10(2022). |
入库方式： OAI收割
来源：武汉岩土力学研究所
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