Abstract Summary
• The work aims to assess numerically the phenomenology underlying the response and performance of large diameter sealing structures under real disposal conditions. • The simulations address the complexity of the problem by considering large scale 3D geometries, advanced constitutive models, complex hydro mechanical coupled formulation, and key geometric details at decimeter scale. • Results evidence a progressive hydration and swelling of the sealing core during more than 2000 years after repository closure. The concrete plugs placed at both ends of the core move longitudinally, but the central part of it maintains a swelling pressure within the admissible design range.
