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Volume 42 Issue S1
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FU Xian-lei, ZHANG Run, WAN Yong, DU Yan-jun, YANG Yu-ling, BI Yu-zhang. Chemico-osmotic membrane behaviors of amended soil-bentonite vertical barrier[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(S1): 172-176. DOI: 10.11779/CJGE2020S1034
Citation: FU Xian-lei, ZHANG Run, WAN Yong, DU Yan-jun, YANG Yu-ling, BI Yu-zhang. Chemico-osmotic membrane behaviors of amended soil-bentonite vertical barrier[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(S1): 172-176. DOI: 10.11779/CJGE2020S1034
shu

Chemico-osmotic membrane behaviors of amended soil-bentonite vertical barrier

  • 1.

    Institute of Geotechnical Engineering, Southeast University, Nanjing 211189, China

  • 2.

    State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

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  • Received Date: June 04, 2020
  • Available Online: December 07, 2022
    Graphical Abstract
    • Abstract
  • A systematic investigation is presented on chemico-osmotic membrane behaviors and diffusive properties of model sand/hexametaphosphate (SHMP)-amended bentonite cutoff-wall backfill (SHMP-SB) for the containment of zinc-impacted groundwater. A multi-stage chemico-osmotic test is conducted to determine the chemico-osmotic efficiency coefficients, effective diffusion coefficients and retardation factors of the backfill using the zinc nitrate (Zn(NO3)2) solution with varied concentrations. The results indicate that the measured chemico-osmotic efficiency coefficients of SHMP-SB gradually decrease and then tend to stabilize with the increasing Zn(NO3)2 concentration. A comparison with the previous studies shows that the measured chemico-osmotic efficiency coefficient of SHMP-SB is about 2-3 times that of the parent soil-bentonite backfill in the Zn(NO3)2 solutions. The effective diffusion coefficient increases with the increasing source concentration of Zn(NO3)2 solution, whereas the retardation factor of zinc decreases with the increasing Zn(NO3)2 concentration.
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    • References (17)
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