Swelling-shrinkage mechanisms of diatomaceous soil and its geohazard implication
文献类型：期刊论文
| 作者 | Zhang, Xianwei1; Liu, Xinyu2; Xu, Yiqing1,3; Wang, Gang1,3; Wang, Fei4 |
| 刊名 | ENGINEERING GEOLOGY
 |
| 出版日期 | 2023-03-05 |
| 卷号 | 314期号:-页码:- |
| ISSN号 | 0013-7952 |
| 关键词 | Diatomaceous soil Swelling-shrinkage Diatoms Clay minerals Microstructure Geohazards |
| 英文摘要 | Current understanding of soil behaviors from classic soil mechanics is constantly challenged by a variety of unusual soils, one of which is diatomaceous soils (DSs). It is well understood that this biological-origin soil has fundamentally different geotechnical features from that of common fine-grained soils because of the presence of diatom fossils. Recently, increasing geohazards and engineering disasters associated with DS swelling-shrinkage are reported but the exact role of diatoms in determining soil swelling-shrinkage, the underlying mechanisms, and the geohazard implications, have not yet been revealed. This study systematically investigates the swel-ling-shrinkage behavior of natural DS as well as artificial mixture of diatoms and clay minerals (kaolinite and montmorillonite). The swelling-shrinkage behaviors are explained from the perspectives of mineralogy and microstructure as revealed through X-ray diffraction, scanning electronic microscopy, and transmission electron microscopy. Diatoms have a special microstructure with inter-frustule pores, and the intra-skeletal and skeletal pores in DS make the soil characterized by a high void ratio and water content. In addition, the presence of diatoms curbs the swelling-shrinkage of DS but this may be overwhelmed by the high stress generated due to the swelling of montmorillonite. The wetting-drying cycles subjected to DS result in fissure development, a higher level of swelling-shrinkage behavior, and ultimately in related geohazards such as landslides. The distinct swelling-shrinkage behavior of DS makes the previous classification inapplicable; thus, more rational classifi-cation methods are adopted. This study enhances the understanding of the swelling-shrinkage behavior of DS and the control of related geohazards. |
| 学科主题 | Engineering ; Geology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000926985100001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35312]  |
| 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 430071, China 2.School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China 3.University of Chinese Academy of Sciences, Beijing 100049, China 4.China Railway Design Corporation, Tianjin 300142, China |
| 推荐引用方式 GB/T 7714 | Zhang, Xianwei,Liu, Xinyu,Xu, Yiqing,et al. Swelling-shrinkage mechanisms of diatomaceous soil and its geohazard implication[J]. ENGINEERING GEOLOGY,2023,314(-):-. |
| APA | Zhang, Xianwei,Liu, Xinyu,Xu, Yiqing,Wang, Gang,&Wang, Fei.(2023).Swelling-shrinkage mechanisms of diatomaceous soil and its geohazard implication.ENGINEERING GEOLOGY,314(-),-. |
| MLA | Zhang, Xianwei,et al."Swelling-shrinkage mechanisms of diatomaceous soil and its geohazard implication".ENGINEERING GEOLOGY 314.-(2023):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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