Shear strength of bentonite saturated with saline solutions exhibiting variety of cations
Investigation of saline solutions on the shear strength (SS) of compacted bentonite is desideratum to evaluate the safety of engineered barriers in order to safely dispose of the high-level radioactive waste. Undrained shear experiments were carried out on Na-bentonite saturated with CaCl2, KCl, and...
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Published in | Engineering geology Vol. 298; p. 106537 |
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Format | Journal Article |
Language | English |
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Elsevier B.V
05.03.2022
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Abstract | Investigation of saline solutions on the shear strength (SS) of compacted bentonite is desideratum to evaluate the safety of engineered barriers in order to safely dispose of the high-level radioactive waste. Undrained shear experiments were carried out on Na-bentonite saturated with CaCl2, KCl, and NaCl solutions. The stress-strain relationship of all the bentonite samples exhibits strain softening behavior, and the peak stress increases with the increase of the saline solution concentration. The SS of samples in saline solutions at 0.1 mol/L (M) follows the order of NaCl< KCl < CaCl2, whereas, in 0.5 M salt solutions it follows the order of NaCl<CaCl2 < KCl, indicating that the cation exchange process has a major impact on the SS of bentonite. The modified effective stress concept p’ was used to express the SS in various salt solutions based on Mohr-Coulomb criterion. The results further revealed that the solution concentration had minimal effect on the angle of internal friction φ’. In addition, the strength envelope remains the same when samples are saturated with different concentrations of NaCl solution, unlike the samples saturated with KCl and CaCl2. At lower salinity concentration (0.1 M), the SS in CaCl2 solution approaches maximum value because of higher osmotic suction. On the contrary, the SS of bentonite saturated with KCl attains the highest value at high concentration (0.5 M), which is attributed with strong K-linkage and low hydration energy of potassium ion.
•Effects of salt solution on shear strength of bentontie are divided into two aspects.•Effects of salt concentration on strength are expressed by effective stress p’.•Effects of cations on strength are described by effective cohesive force c’.•Salt solution has little effect on angle of internal friction φ’. |
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AbstractList | Investigation of saline solutions on the shear strength (SS) of compacted bentonite is desideratum to evaluate the safety of engineered barriers in order to safely dispose of the high-level radioactive waste. Undrained shear experiments were carried out on Na-bentonite saturated with CaCl2, KCl, and NaCl solutions. The stress-strain relationship of all the bentonite samples exhibits strain softening behavior, and the peak stress increases with the increase of the saline solution concentration. The SS of samples in saline solutions at 0.1 mol/L (M) follows the order of NaCl< KCl < CaCl2, whereas, in 0.5 M salt solutions it follows the order of NaCl<CaCl2 < KCl, indicating that the cation exchange process has a major impact on the SS of bentonite. The modified effective stress concept p’ was used to express the SS in various salt solutions based on Mohr-Coulomb criterion. The results further revealed that the solution concentration had minimal effect on the angle of internal friction φ’. In addition, the strength envelope remains the same when samples are saturated with different concentrations of NaCl solution, unlike the samples saturated with KCl and CaCl2. At lower salinity concentration (0.1 M), the SS in CaCl2 solution approaches maximum value because of higher osmotic suction. On the contrary, the SS of bentonite saturated with KCl attains the highest value at high concentration (0.5 M), which is attributed with strong K-linkage and low hydration energy of potassium ion.
•Effects of salt solution on shear strength of bentontie are divided into two aspects.•Effects of salt concentration on strength are expressed by effective stress p’.•Effects of cations on strength are described by effective cohesive force c’.•Salt solution has little effect on angle of internal friction φ’. |
ArticleNumber | 106537 |
Author | Jalal, Fazal E. Hu, Zhijie Xiang, Guosheng Ye, Weimin |
Author_xml | – sequence: 1 givenname: Guosheng surname: Xiang fullname: Xiang, Guosheng email: xianggsh@ahut.edu.cn organization: College of Civil Engineering, Tongji University, Shanghai 200092, China – sequence: 2 givenname: Weimin surname: Ye fullname: Ye, Weimin email: ye_tju@tongji.edu.cn organization: College of Civil Engineering, Tongji University, Shanghai 200092, China – sequence: 3 givenname: Fazal E. surname: Jalal fullname: Jalal, Fazal E. organization: Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China – sequence: 4 givenname: Zhijie surname: Hu fullname: Hu, Zhijie organization: Department of Civil Engineering, Anhui University of Technology, Ma'anshan, Anhui 243002, China |
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Keywords | Cation exchange Bentonite Shear strength Fractal Salt solution |
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Title | Shear strength of bentonite saturated with saline solutions exhibiting variety of cations |
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