Diatom-induced impact on shear strength characteristics of finegrained soils
文献类型：期刊论文
| 作者 | Wang Gang2; Zhang Xianwei2; Liu Xinyu1; Xu Yiqing2; An Ran2 |
| 刊名 | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
 |
| 出版日期 | 2024 |
| 卷号 | 16期号:11页码:4711 |
| 关键词 | Diatom Diatomaceous soil Fine-grained soil Shear strength Microstructure Atomic force microscope (AFM) |
| ISSN号 | 1674-7755 |
| 英文摘要 | Diatomaceous soils, composed of diatom microfossils with biological origins, have geotechnical properties that are fundamentally different from those of conventional non-diatomaceous fine-grained soils. Despite their high fines content, diatomaceous soils typically exhibit remarkably high shear resistance, approaching that of sandy soils. However, the exact role that diatoms play in controlling the mechanical properties of fine-grained soils and the underlying mechanisms remain unclear. In light of this, the shear strength response of diatomaceous soils was systematically investigated using consolidated undrained triaxial compression tests on diatomekaolin mixtures (DKMs) with various diatom contents and overconsolidation ratios. The micro- and nano-scale structures of the soil samples were characterized in detail using scanning electron microscope (SEM) and atomic force microscope (AFM) to interpret the abnormal shear strength parameters of diatomaceous soils. The results indicated that the presence of diatoms could contribute to significantly higher strength, e.g. the friction angle of DKMs was improved by 72.7% to 37° and the value of undrained shear strength tripled with diatom content increasing from 20% to 100%. Such significant improvement in soil strength with diatom inclusion could be attribute to the hard siliceous skeleton of diatoms and the interlocking between particles with rough surfaces, which were quantitatively analyzed by the surface roughness parameters with AFM. Furthermore, a conceptual model established based on the macro-mechanical tests and microscopic observations portrays a microstructural evolution of soils with increasing diatoms. The microstructure of soils was gradually transformed from the matrix-type to the skeletal one, resulting in a continual augmentation in shear strength through mutual interactions between diatom microfossils. This paper provides new insights into the multi-scale structural properties of diatoms and significantly advances our understanding of the mechanical behavior of diatomaceous soils. |
| 语种 | 英语 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/37967]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.成都理工大学 2.中国科学院武汉岩土力学研究所 |
| 推荐引用方式 GB/T 7714 | Wang Gang,Zhang Xianwei,Liu Xinyu,et al. Diatom-induced impact on shear strength characteristics of finegrained soils[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2024,16(11):4711. |
| APA | Wang Gang,Zhang Xianwei,Liu Xinyu,Xu Yiqing,&An Ran.(2024).Diatom-induced impact on shear strength characteristics of finegrained soils.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,16(11),4711. |
| MLA | Wang Gang,et al."Diatom-induced impact on shear strength characteristics of finegrained soils".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 16.11(2024):4711. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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