Comparison of the hydrogeochemical and mechanical behaviours of compacted bentonite using different conceptual approaches

Yustres, A.; Jenni, Andreas; Asensio, L.; Pintado, X.; Koskinen, K.; Navarro, V.; Wersin, Paul (2017). Comparison of the hydrogeochemical and mechanical behaviours of compacted bentonite using different conceptual approaches. Applied Clay Science, 141, pp. 280-291. Elsevier 10.1016/j.clay.2017.03.006

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This study compares the capabilities of two numerical models that simulate the behaviour of compacted saturated MX-80 bentonite exposed to different chemical environments. Both codes have different approaches: one of them is a reactive transport model, and the other is a hydrogeomechanical model. The study shows that the combined use of both approaches provides a useful basis for designing bentonite barriers in the geological disposal of high-level nuclear waste. Although, their application is now limited to simple geometries and boundary conditions, the proposed approaches are a first step towards a fully thermo-hydro-mechano-chemical model. It is also shown that there is a need for a greater understanding of the chemomechanical coupling that occurs at the microstructural scale to achieve this comprehensive model in the future.

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