Compressibility, permeability and microstructure of fine-grained soils containing diatom microfossils
文献类型：期刊论文
| 作者 | Zhang, Xianwei4; Liu, Xinyu1; Xu, Yiqing5; Wang, Gang2; Ren, Yubin3 |
| 刊名 | GEOTECHNIQUE
 |
| 出版日期 | 2023-01-27 |
| 期号 | -页码:- |
| 关键词 | compressibility diatom diatom-kaolin mixture microstructure permeability pore |
| ISSN号 | 0016-8505 |
| 英文摘要 | Fine-grained soils containing diatom microfossils of biological origin are found worldwide. However, although these soils are acknowledged to have unique physical and mechanical properties, the exact role of diatoms in determining their compression and hydraulic behaviours remains unclear, especially when high effective stress is involved, and the underlying micromechanism is yet to be revealed. This study investigated the compression and permeability of diatomaceous soils prepared by mixing pure diatom and kaolin powders through one-dimensional constant rate of strain compression tests with a maximum vertical stress of 10 MPa. The microstructure of the soils studied was observed by atomic force microscopy, scanning electron microscopy and mercury intrusion porosimetry, and the microstructural evolution during compression was traced. The results indicate that the special hollow structure of diatom particles with internal pores contributes significantly to the high void ratio, compressibility and permeability of diatomaceous soils, and increasing the diatom content improves the pore distribution non-uniformity of the diatom-kaolin mixtures. In addition, the diatom particles have high brittleness and breakage potential, leading to microstructural rearrangement during compression, especially pore-structure adjustment. Lower compressive stress deforms the inter- and intra-aggregate pores, but higher vertical stress damages the diatoms' hollow structure, which changes the compression and hydraulic parameters in a different manner from the case of conventional clay. This paper enriches the knowledge concerning the multilevel behaviour of fine-grained soils containing diatom microfossils and provides a fundamental dataset. |
| 学科主题 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000919485900001 |
| 出版者 | ICE PUBLISHING |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35378]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, P. R. China; also University of Chinese Academy of Sciences, Beijing, P. R. China; also School of Civil and Hydraul 2.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, P. R. China; also University of Chinese Academy of Sciences, Beijing, P. R. China 3.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, P. R. China 4.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, P. R. China 5.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, P. R. China; also University of Chinese Academy of Sciences, Beijing, P. R. China |
| 推荐引用方式 GB/T 7714 | Zhang, Xianwei,Liu, Xinyu,Xu, Yiqing,et al. Compressibility, permeability and microstructure of fine-grained soils containing diatom microfossils[J]. GEOTECHNIQUE,2023(-):-. |
| APA | Zhang, Xianwei,Liu, Xinyu,Xu, Yiqing,Wang, Gang,&Ren, Yubin.(2023).Compressibility, permeability and microstructure of fine-grained soils containing diatom microfossils.GEOTECHNIQUE(-),-. |
| MLA | Zhang, Xianwei,et al."Compressibility, permeability and microstructure of fine-grained soils containing diatom microfossils".GEOTECHNIQUE .-(2023):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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