Insights into the Microstructural Evolution of a Sand-Bentonite Mixture with Low Bentonite Fraction due to Dehydration
文献类型：期刊论文
| 作者 | He, Yong2; Qin, Yi-tong2; Zhang, Zhao2; Ni, Xue-qian3; Wang, Hao4; Haroon, Ahmed Malik Muhammad2; Guo, Jian5; Zhang, Ke-neng2; Zhang, Feng1 |
| 刊名 | INTERNATIONAL JOURNAL OF GEOMECHANICS
 |
| 出版日期 | 2025-10-01 |
| 卷号 | 25期号:10页码:4025203 |
| 关键词 | Soil-bentonite backfill Vertical cutoff wall Water retention Shrinkage Pore structure |
| ISSN号 | 1532-3641 |
| DOI | 10.1061/IJGNAI.GMENG-10943 |
| 产权排序 | 4 |
| 文献子类 | Article |
| 英文摘要 | A soil-bentonite vertical cutoff wall is commonly employed as an effective engineered barrier in contaminated sites to prevent the spread of chemical pollutants. Over time, the soil-bentonite backfills experience suction changes due to alternating rainfall and evaporation processes, as well as fluctuations in water levels, leading to a decrease in the inhibition capability and a settlement in the soil structure. To clarify this point, water retention tests and microscopic tests were conducted on a type of soil-bentonite backfill which was composed of river sand and a low content of bentonite (5%). Experimental results demonstrated that the water retention curve exhibited a typical anti-S-shaped pattern. By considering the air entry value psi(AEV) and the residual suction psi(r) as the dividing boundaries, three distinct zones could be closely identified from the water retention curve. The water loss and soil shrinkage of sand-bentonite backfills displayed similar development trends, with significant changes at the low-suction zone (psi(AEV) < psi(r)) and less noticeable changes at the high-suction zone (s > psi(r)). The pore structure of the backfill evolved from a single-porosity to a double-porosity structure with the increase of suction, and finally returned to a single-porosity structure while approaching to the dried state. This transformation in the pore structure was influenced by an aggregation of bentonite layers and the exposed pores between sand particles. A calculation method on the basis of water retention mechanisms was developed to quantitatively analyze the micropore evolution, and its accuracy was validated through a comparison with experimental data. (c) 2025 American Society of Civil Engineers |
| URL标识 | 查看原文 |
| WOS关键词 | HYDRAULIC CONDUCTIVITY ; CALCIUM BENTONITE ; WALL BACKFILL ; CLAYEY SOIL ; COMPRESSIBILITY ; BEHAVIOR ; BARRIER |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001551028300027 |
| 出版者 | ASCE-AMER SOC CIVIL ENGINEERS |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/215544]  |
| 专题 | 陆地表层格局与模拟院重点实验室_外文论文 |
| 通讯作者 | Zhang, Zhao |
| 作者单位 | 1.Tongji Univ, Coll Civil Engn, Sch Geotech Engn, Shanghai 200092, Peoples R China 2.Cent South Univ, Sch Geosci & Infophys, 932 South Lushan Rd, Changsha 410083, Peoples R China; 3.Cent South Univ, Sch Civil Engn, Changsha 410083, Peoples R China; 4.Ecole Ponts ParisTech, Lab Navier CERMES, 6 & 8 Ave Blaise Pascal, F-77455 Marne La Vallee 2, France; 5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China; |
| 推荐引用方式 GB/T 7714 | He, Yong,Qin, Yi-tong,Zhang, Zhao,et al. Insights into the Microstructural Evolution of a Sand-Bentonite Mixture with Low Bentonite Fraction due to Dehydration[J]. INTERNATIONAL JOURNAL OF GEOMECHANICS,2025,25(10):4025203. |
| APA | He, Yong.,Qin, Yi-tong.,Zhang, Zhao.,Ni, Xue-qian.,Wang, Hao.,...&Zhang, Feng.(2025).Insights into the Microstructural Evolution of a Sand-Bentonite Mixture with Low Bentonite Fraction due to Dehydration.INTERNATIONAL JOURNAL OF GEOMECHANICS,25(10),4025203. |
| MLA | He, Yong,et al."Insights into the Microstructural Evolution of a Sand-Bentonite Mixture with Low Bentonite Fraction due to Dehydration".INTERNATIONAL JOURNAL OF GEOMECHANICS 25.10(2025):4025203. |
入库方式： OAI收割
来源：地理科学与资源研究所
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