Experimental study of steady seepage in unsaturated loess soil
文献类型：期刊论文
| 作者 | Tian, Kanliang1,2; Yang, Aoqiu1; Nie, Kangyi3; Zhang, Huili3; Xu, Jin3; Wang, Xiaodong1 |
| 刊名 | ACTA GEOTECHNICA
 |
| 出版日期 | 2020-09-01 |
| 卷号 | 15期号:9页码:2681-2689 |
| 关键词 | Matric suction Permeability coefficient Seepage law Steady seepage Unsaturated soil |
| ISSN号 | 1861-1125 |
| DOI | 10.1007/s11440-020-00948-2 |
| 通讯作者 | Zhang, Huili(huilizhang163@163.com) |
| 英文摘要 | The complexity of unsaturated soil means that its permeability coefficient and seepage law are important topics in soil mechanics and geotechnical engineering. In this study, a new type of equipment for measuring the seepage of unsaturated soil was used to study the steady seepage of unsaturated loess soil collected from northern Shaanxi province in China. The entire process of the steady seepage of unsaturated soil under different seepage hydraulic gradients was obtained, and the permeability coefficient in the steady seepage state was measured. When the soil water content was low, the soil moisture remained only in small pores or at the junction of soil particles, the effective seepage area of the sample was reduced, and the seepage path was extended. Therefore, the lower the water content, the smaller the permeability coefficient of unsaturated soil and the longer the time required for the seepage to reach a steady state. The matric suction of the unsaturated loess soil was measured under different water contents. With decreasing water content, water remained only in the smaller pores, which provided shrink films with a smaller radius of curvature. This allowed the shrink films to withstand a larger pore air pressure and transmit a smaller pore water pressure, so that the matric suction of the loess soil increased with decreasing soil water content. The Gardner model provided an accurate fit of how the matric suction varied with the volumetric water content of the unsaturated soil. The seepage velocity and seepage hydraulic gradient were correlated well with a linear relationship, indicating that the seepage law of unsaturated loess soil accords with Darcy's law. The experimental results show that the new unsaturated soil permeameter has good performance and controllability, thereby providing support for studying the steady seepage of unsaturated soil. |
| WOS关键词 | HYDRAULIC CONDUCTIVITY ; PERMEABILITY ; WATER |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000554784100019 |
| 出版者 | SPRINGER HEIDELBERG |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/158252]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Zhang, Huili |
| 作者单位 | 1.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 3.Northwest A&F Univ, Coll Water Resources & Architectural Engn, Yangling 712100, Shaanxi, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tian, Kanliang,Yang, Aoqiu,Nie, Kangyi,et al. Experimental study of steady seepage in unsaturated loess soil[J]. ACTA GEOTECHNICA,2020,15(9):2681-2689. |
| APA | Tian, Kanliang,Yang, Aoqiu,Nie, Kangyi,Zhang, Huili,Xu, Jin,&Wang, Xiaodong.(2020).Experimental study of steady seepage in unsaturated loess soil.ACTA GEOTECHNICA,15(9),2681-2689. |
| MLA | Tian, Kanliang,et al."Experimental study of steady seepage in unsaturated loess soil".ACTA GEOTECHNICA 15.9(2020):2681-2689. |
入库方式： OAI收割
来源：地理科学与资源研究所
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