Causes of the high friction angle of diatomaceous soil: microscale and nanoscale insights
文献类型：期刊论文
| 作者 | Zhang, Xianwei2; Liu, Xinyu1,5; Wang, Gang2,3; Xu, Yiqing2; Gao, Haodong4 |
| 刊名 | GEOTECHNIQUE
 |
| 出版日期 | 2024-02-07 |
| 页码 | 41 |
| 关键词 | Diatomaceous soil shear strength microstructure atomic force microscopy surface roughness modulus of elasticity |
| ISSN号 | 0016-8505 |
| DOI | 10.1680/jgeot.23.00230 |
| 英文摘要 | Diatomaceous soil has geotechnical properties that differ fundamentally from those of common non-diatomaceous soils due to the presence of diatom microfossils with biological origins. Despite its dominant fines content, diatomaceous soil usually has high frictional shear resistance (approaching that of sand). Currently, the exact role of diatoms in controlling soil strength and underlying mechanisms remain obscure. Here, the frictional strength of diatomaceous soil is evaluated via angle-of-repose and direct simple shear tests on diatom-kaolin mixtures with differing diatom content. The microscale and nanoscale structures are characterised in detail via scanning-electron and atomic-force microscopy to establish how soil structure evolutes with diatom content and shear. For the studied diatom-kaolin mixtures, the angle of repose and internal frictional angle are high and increase with diatom content, especially when diatom content exceeds 20%. Diatom controls the frictional strength through its intricate morphology (cylindrical, saucer and disc shapes), very rough surface (hundreds of times rougher than flaky minerals), and stiff frustules with high Young's modulus. These features increase the particle coordination number and produce interparticle interlockings, both of which prevent particle rearrangement during shear and improve the frictional strength. This paper provides new insights into the multiscale structure of diatoms and improves the understanding of the shear strength of diatomaceous soils. |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001160011300001 |
| 出版者 | EMERALD GROUP PUBLISHING LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/40599]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Liu, Xinyu |
| 作者单位 | 1.Huazhong Univ Sci & Technol, Sch Civil & Hydraul Engn, Wuhan, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Wuhan Univ Sci & Technol, Coll Urban Construct, Wuhan, Peoples R China 5.Huazhong Univ Sci & Technol, 1037 Luoyu Rd, Wuhan 430074, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Xianwei,Liu, Xinyu,Wang, Gang,et al. Causes of the high friction angle of diatomaceous soil: microscale and nanoscale insights[J]. GEOTECHNIQUE,2024:41. |
| APA | Zhang, Xianwei,Liu, Xinyu,Wang, Gang,Xu, Yiqing,&Gao, Haodong.(2024).Causes of the high friction angle of diatomaceous soil: microscale and nanoscale insights.GEOTECHNIQUE,41. |
| MLA | Zhang, Xianwei,et al."Causes of the high friction angle of diatomaceous soil: microscale and nanoscale insights".GEOTECHNIQUE (2024):41. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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