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Modeling water retention curve of gcl exposed to pore fluid with solute concentrations

Golaghaei Darzi, A ; Sharif University of Technology | 2023

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  1. Type of Document: Article
  2. DOI: 10.1007/978-981-99-4041-7_14
  3. Publisher: Springer Science and Business Media Deutschland GmbH , 2023
  4. Abstract:
  5. Geosynthetic clay liners (GCLs) are synthetic materials manufactured and widely used in geotechnical and geoenvironmental engineering due to their very low permeability and ease of use. As the most critical function of GCLs are their isolating features, it is of primary importance to precisely predict their water retention properties, especially when subjected to impure water having considerable solute concentrations because of landfill leachate. Despite numerous efforts on analytical modeling of bare soil-distilled water retention, less attention has been given to the retention characteristics of GCLs. Therefore, the current study's primary goal is to introduce a new analytical GCL-water retention model. More importantly, the selected experimental data for validation of the model comprises permeating solution with different molar concentrations along the wetting path to idealize leachate characteristics more reliably during the hydration process. The presented model is an extension of the original van Genuchten model for bare soil and pure water. The novelty of the proposed modeling approach is incorporating a new parameter, namely the pore fluid salinity index (PSI) through which, considering the influence of pore fluid chemistry on retention properties of different types of GCLs, becomes possible. The model can simply be calibrated by using a series of retention data in the presence of distilled water and one salinity level. The results also reveal the new model's robustness in capturing the retention behavior of GCLs under the influence of leachate. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2023
  6. Keywords:
  7. Isolating barrier ; Landfill ; Leachate chemistry ; Water retention
  8. Source: Lecture Notes in Civil Engineering ; Volume 370 LNCE , 2023 , Pages 133-144 ; 23662557 (ISSN); 978-981994040-0 (ISBN)
  9. URL: https://link.springer.com/chapter/10.1007/978-981-99-4041-7_14