A new hydraulic barrier with the gradient distribution of fixed net negative charges
文献类型：期刊论文
| 作者 | Ma, Tiantian2; Liu, Tingli1 |
| 刊名 | SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
 |
| 出版日期 | 2025 |
| 卷号 | 89期号:1页码:12 |
| ISSN号 | 0361-5995 |
| DOI | 10.1002/saj2.70020 |
| 英文摘要 | Bentonite, commonly used for geological disposal of high-level radioactive waste and landfill liners, can experience increased permeability under high groundwater salinity, compromising its effectiveness. This article presents a novel approach to enhance the anti-seepage performance of hydraulic barriers, particularly in hypersaline environments. The proposed design incorporates a gradient distribution of fixed net negative charges, based on the principles of the Donnan equilibrium and generalized Darcy's law. The Donnan equilibrium, caused by fixed net charges on clay particles, alters the salt concentration of pore water that seeps through the soil. This creates a semipermeable membrane effect on the clay, leading to a concentration difference of salts between the flowing water in the soil and the external water supply. The concentration difference is dependent on the density of fixed net negative charges on the clay surfaces. By artificially controlling the distribution of fixed net negative charges, a salinity gradient is induced in the pore water. Based on the generalized Darcy's law, the salinity gradient can counteract seepage driven by pressure gradients and effectively reduce the seepage velocity. The study discusses key factors affecting the gradient distribution of fixed net charges in the designed hydraulic barrier, including void ratio, external solution concentration, and cation exchange capacity. The new hydraulic barrier is compared with existing methods (traditional bentonite and polymer-bentonite mixtures), demonstrating the effectiveness of the proposed method in enhancing anti-seepage performance, especially in hypersaline environments. |
| 资助项目 | Science and Technology Program of CNOOC Research Institute ; National Natural Science Foundation of China (NSFC)[42472356] ; National Natural Science Foundation of China (NSFC)[51939011] ; Research Fund from State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Chinese Academy of Sciences[JBGS2405] ; [2023OT-KK03] |
| WOS研究方向 | Agriculture |
| 语种 | 英语 |
| WOS记录号 | WOS:001417383300001 |
| 出版者 | WILEY |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/36927]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Ma, Tiantian |
| 作者单位 | 1.Guilin Univ Technol, Coll Civil & Architectural Engn, Guilin, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn Safety, Wuhan 430071, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ma, Tiantian,Liu, Tingli. A new hydraulic barrier with the gradient distribution of fixed net negative charges[J]. SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,2025,89(1):12. |
| APA | Ma, Tiantian,&Liu, Tingli.(2025).A new hydraulic barrier with the gradient distribution of fixed net negative charges.SOIL SCIENCE SOCIETY OF AMERICA JOURNAL,89(1),12. |
| MLA | Ma, Tiantian,et al."A new hydraulic barrier with the gradient distribution of fixed net negative charges".SOIL SCIENCE SOCIETY OF AMERICA JOURNAL 89.1(2025):12. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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