Estimation of water retention behaviour of MX-80 bentonite partially saturated with saline solution

Kuusela-Lahtinen, Auli; Sinnathamby, Gowthaman; Mendez, João; Sołowski, Wojciech Tomasz; Gallipoli, Domenico; Pintado, Xavier; Korkiala-Tanttu, Leena

doi:10.1051/e3sconf/20160911006

Cited by 7 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…wherek(h) is the suction dependent hydraulic conductivity and h is the total head being the sum of the pressure head  and the geodetic head z.Equation (18) shows that the net water flux expressed by the left hand side should be equal to the water mass stored or expelled by the soil expressed by the right hand side. On expandingequation (18)it becomes:…”

Section: Single Phase Flow Formulationmentioning

confidence: 99%

See 1 more Smart Citation

Hydro-mechanical modelling of MX-80 bentonite: one dimensional study

et al. 2016

Self Cite

View full text Add to dashboard Cite

Abstract.As a first step towards modelling the coupled Thermo-Hydro-Mechanical-Chemical (THMC) behaviour of bentonite, the Barcelona Basic Model (BBM) has been implemented into Numerrinfinite element code. This model has beenfully coupled with the single phase flow equation for unsaturated soils which models liquid water transport. Suction obtained from solving the flow equation is used as an input for the BBM model and the volumetric deformations from the mechanical analysis are used to update the pore water pressure field. As an alternative, BBM is used alongside the Kröhn's model which assumes that bentonite re-saturation is mainly driven by water vapour diffusion. The paper simulates one dimensional infiltration test on MX-80bentonite with both implemented modelsfor water transport and compares the results withthose from a laboratory experiments based on X-ray tomography.The numerical results of the simulations are similar despite taking into account different physical phenomena.

show abstract

Section: Single Phase Flow Formulationmentioning

confidence: 99%

“…The soil water retention curve was estimated using the data from literature [16][17] as well as measurements [18] for the tested bentonite. The approximation of the datawith van Genuchtenmodel is shown in Figure 6.…”

Section: Hydraulic Parametersmentioning

confidence: 99%

Hydro-mechanical modelling of MX-80 bentonite: one dimensional study

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…The hysteresis is attributed to several reasons including the non-uniformity of the pores leading to the inkbottle effect, the difference in contact angle in wetting and drying phases and the entrapped air within the pores during drying process (Haines, 1930). The accumulated research data also reveal other factors that influence the water retention curve including, but not restricted to: i) initial dry density (void ratio), ii) temperature, iii) chemical and salt concentration (Jacinto et al, 2009;Kuusela-Lahtinen et al, 2016). Ideally, all the aforementioned factors should be addressed during modelling.…”

Section: Introductionmentioning

confidence: 99%

Estimation of water retention behaviour of bentonite based on mineralogy and mercury intrusion porosimetry tests

Abed

Sołowski

2021

Géotechnique

Self Cite

View full text Add to dashboard Cite

This paper develops a water retention model based on the soil mineralogy and microscopic features of the material behaviour. The model estimates the water content at a given total suction as the sum of the bentonite minerals interlayer water and the water in the interparticle pores. The paper proposes simple formulae to estimate the interlayer water content and interlayer void ratio based on mineralogical properties. Additionally, the model uses the mercury intrusion porosimetry measurements to approximate the water content in the larger pores. The validation of the proposed procedure relies on published data for MX-80 and GMZ bentonites and yields promising results. Even though the discussion and the validation are restricted to bentonite here, the procedure is generic in nature and can be modified easily for other geomaterials. The paper also offers insights into the links between soil microstructure and its macroscopic behaviour. The contribution provides a new tool for quick indirect estimation of the water retention behaviour of porous materials with known mineral composition and available microstructural data, e.g. based on the mercury intrusion porosimetry tests. Such tool is of high practical interest in design e.g. nuclear waste repositories where large material pool may be initially considered.

show abstract

Numerical modelling on water retention and permeability of compacted GMZ bentonite under free‐swelling conditions

Liu

Guo

et al. 2020

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

SummaryIn this study, a solid–liquid–gas coupled equation was established to simulate water retention characteristics of highly compacted GMZ bentonite. Then, modelling results were compared with laboratory test results. Results indicate that GMZ bentonite has a strong moisture expansion (or a limit drying shrinkage) characteristic. The control equation can simulate the water absorption and deformation characteristics very well at high relative humidity (or low suction). Environmental scanning electron microscope (ESEM) observation reveals the course grain soil texture of the surface under low relative humidity (RH), while the surface of GMZ bentonite becomes smooth (more fine‐grained soil texture) as RH increases. Differences were found between the porosities calculated by macroexperiment results and microscopic observations with ESEM method. This is because only the interaggregate pores can be observed by ESEM photographs. Additionally, we find that the simulated effective porosities are close to the results calculated by microscopic tests, while the effective porosity is considered as the main flow channel of flow. Further, the intrinsic permeability, the effective water and gas permeability are calculated based on the proposed model. The modelling results coincide well with the laboratory experimental results and support the reliability of the proposed model.

show abstract

Estimation of water retention behaviour of MX-80 bentonite partially saturated with saline solution

Cited by 7 publications

References 17 publications

Hydro-mechanical modelling of MX-80 bentonite: one dimensional study

Hydro-mechanical modelling of MX-80 bentonite: one dimensional study

Estimation of water retention behaviour of bentonite based on mineralogy and mercury intrusion porosimetry tests

Numerical modelling on water retention and permeability of compacted GMZ bentonite under free‐swelling conditions

Contact Info

Product

Resources

About