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Volume 43 Issue 4
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ZHENG Xin-jiang, XU Yong-fu. Strength characteristics of GMZ bentonite saturated with salt solutions[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(4): 783-788. DOI: 10.11779/CJGE202104022
Citation: ZHENG Xin-jiang, XU Yong-fu. Strength characteristics of GMZ bentonite saturated with salt solutions[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(4): 783-788. DOI: 10.11779/CJGE202104022
shu

Strength characteristics of GMZ bentonite saturated with salt solutions

  • Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200030, China

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  • Received Date: June 22, 2020
  • Available Online: December 04, 2022
    Graphical Abstract
    • Abstract
  • Bentonite is selected as a buffer and backfill material for deep geological repositories due to its high expansibility, low permeability, and excellent nuclide adsorptive. In order to study the effect of the pore solution of the surrounding rock on the strength of bentonite, GMZ07 bentonite specimens are saturated and consolidated in Na2SO4 solution with different concentrations for direct shear tests. The test results show that as the concentration of the salt solution increases, the cohesive intercept and internal friction angle of the bentonite sample increase, and the strength increases significantly. Based on the fractal model for bentonite surface, the modified effective stress that considers the osmotic suction is introduced to explain the test results. The shear strength of GMZ07 bentonite in Na2SO4 solution calculated by the modified effective stress is compared with the measured value, and the two are basically in agreement, which verifies the correctness of the modified effective stress considering the osmotic suction.
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    • References (38)
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