Effects of chemical solution on the deformation and strength characteristics of expansive soil
文献类型：期刊论文
| 作者 | Yao, Chuanqin2,3; Liu, Jinjin3; An, Ran1 |
| 刊名 | ENVIRONMENTAL EARTH SCIENCES
 |
| 出版日期 | 2024-06-01 |
| 卷号 | 83期号:12页码:13 |
| 关键词 | Chemical solution Deformation Strength Intergranular stress Structure |
| ISSN号 | 1866-6280 |
| DOI | 10.1007/s12665-024-11599-x |
| 英文摘要 | Pore fluid chemistry can obviously influence the deformation and strength of expansive soil. To investigate the change rules and the underlying mechanisms, free swelling rate and direct shear experiments are conducted on expansive soils immersed with different concentrations of NaCl and CaCl2 solutions. The free swelling rate of the expansive soil, with increasing solution concentration, first rapidly decreases and then continues to gently decrease. Moreover, the NaCl solution has a greater effect on the free swelling rate of the expansive soil than the CaCl2 solution. The soil shear strength and cohesion decrease with increasing solution concentration; nevertheless, the effect of solution concentration on the internal friction angle is less significant. The test result analysis indicate that the expansive soil surface carries a fixed negative charge, forming an electric double layer on the particle surfaces. With increasing salt solution concentration, the double layer thickness decreases, resulting in reduced particle repulsion and increased intergranular stress. Consequently, soil particle settlement occurs, which reduces the free swelling rate. Specifically, twice as much Cl- is dissociated from CaCl2 as NaCl for salt solutions with the same molar concentration, resulting in greater intergranular stress and smaller free swelling rate. Theoretically, the shear strength should increase with the salt solution concentration, due to the increase of intergranular stress. However, the scanning electron microscope experiments and the mercury intrusion porosimetry experiments show that the expansive soil microstructure changes based on the salt solution concentration, contributing to the reduction of the shear strength. The above two factors have opposite effects on the shear strength. For the Ningming expansive soil considered herein, the shear strength decreases with increasing concentration, as the impact of structure surpasses that of intergranular stress. |
| 资助项目 | National Natural Science Foundation of China ; Shanghai Sailing Program[21YF1432700] ; Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[SKLGME022015] ; [52109133] |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:001236274300003 |
| 出版者 | SPRINGER |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/41489]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | An, Ran |
| 作者单位 | 1.Hefei Univ Technol, Sch Civil & Hydraul Engn, Hefei, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Peoples R China 3.Shanghai Normal Univ, Sch Civil Engn, Shanghai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yao, Chuanqin,Liu, Jinjin,An, Ran. Effects of chemical solution on the deformation and strength characteristics of expansive soil[J]. ENVIRONMENTAL EARTH SCIENCES,2024,83(12):13. |
| APA | Yao, Chuanqin,Liu, Jinjin,&An, Ran.(2024).Effects of chemical solution on the deformation and strength characteristics of expansive soil.ENVIRONMENTAL EARTH SCIENCES,83(12),13. |
| MLA | Yao, Chuanqin,et al."Effects of chemical solution on the deformation and strength characteristics of expansive soil".ENVIRONMENTAL EARTH SCIENCES 83.12(2024):13. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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