The lateral pressure coefficient at rest of expansive soils in landfill at various vertical stresses and moisture contents
文献类型：期刊论文
| 作者 | Zhou, Zhen-hua; Kong, Ling-wei; Sun, Zhi-liang; Li, Tian-guo; Yan, Jun-biao |
| 刊名 | JOURNAL OF MOUNTAIN SCIENCE
 |
| 出版日期 | 2023-04-01 |
| 卷号 | 20期号:4页码:1102 |
| ISSN号 | 1672-6316 |
| 关键词 | Expansive soil k(o) value Landfill Vertical stress Moisture content |
| 英文摘要 | When expansive soils in the original location are artificially transferred to landfill in different seasons, and subject to engineering activities afterwards, the corresponding deformation and stability of retaining structures become unpredictable. This necessitates the determination of lateral pressure coefficient at rest (k(o) value) for expansive soils in landfill. Considering compaction, excavation of expansive soils, as well as construction of landfill in different seasons, series of stepwise loading and unloading consolidation tests at various moisture contents were carried out in this work to explore the evolution characteristics of k(o) value and assess the dependence of k(o) value on vertical stress and moisture content. Besides, scanning electron microscope (SEM) was used to track the change in microstructural features with vertical stresses. The results indicated that the k(o) value of expansive soil shows a pronounced nonlinearity and is inextricably linked with vertical stress and moisture content, based on which a prediction formula to estimate the variation in k(o) value with vertical stress during loading stage was proposed; there is a significant exponential increase in k(o) value with overconsolidation ratio (OCR) during unloading stage, and OCR dominates the release of horizontal stress of expansive soil; SEM results revealed that with an increase in vertical stress, the anisotropy of expansive soil microstructure increases dramatically, causing a significant directional readjustment, which is macroscopically manifested as an initially rapid increase in k(o) value; but when vertical stress increases to a critical value, the anisotropy of microstructure increases marginally, indicating a stable orientation occurring in the soil microstructure, which causes the k(o) value to maintain at a relatively stable value. |
| 学科主题 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000963723500009 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34845]  |
| 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.Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS |
| 推荐引用方式 GB/T 7714 | Zhou, Zhen-hua,Kong, Ling-wei,Sun, Zhi-liang,et al. The lateral pressure coefficient at rest of expansive soils in landfill at various vertical stresses and moisture contents[J]. JOURNAL OF MOUNTAIN SCIENCE,2023,20(4):1102. |
| APA | Zhou, Zhen-hua,Kong, Ling-wei,Sun, Zhi-liang,Li, Tian-guo,&Yan, Jun-biao.(2023).The lateral pressure coefficient at rest of expansive soils in landfill at various vertical stresses and moisture contents.JOURNAL OF MOUNTAIN SCIENCE,20(4),1102. |
| MLA | Zhou, Zhen-hua,et al."The lateral pressure coefficient at rest of expansive soils in landfill at various vertical stresses and moisture contents".JOURNAL OF MOUNTAIN SCIENCE 20.4(2023):1102. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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