Evaluation of the Instantaneous Profile Method for the Determination of the Relative Permeability Function
Experimental determination of water permeability in unsaturated conditions is a critical issue. Among the existing experimental techniques, the instantaneous profile method is frequently used. When applied to bentonite-based materials, the method often shows that the water permeability–suction function significantly differs depending on the distance from the wetting face. Such behaviour has been interpreted as a consequence of structural changes in the sample which directly affect the water flow properties. In order to better understand the involved processes, a hydromechanical simulation of an infiltration test is performed. While structural changes are shown to affect the hydraulic properties, the computed water permeability–suction evolution is strongly affected by the interpretation of the raw experimental data.
KeywordsWater Permeability Infiltration Test Relative Humidity Sensor Relative Permeability Function Water Content Profile
- Dieudonne AC, Charlier R, Levasseur S, Della Vecchia G, Jommi C (2014) Evolution of clay fabric and water retention properties along hydromechanical stress paths. In: Proceedings of the 8th European conference on numerical methods in geotechnical engineering, NUMGE 2014, pp 971–975Google Scholar
- Dieudonne AC, Gatabin C, Talandier J, Collin F, Charlier R (2016) Water retention behaviour of compacted bentonites: experimental observations and constitutive model. In: 3rd European conference on unsaturated soils – E-UNSAT 2016. E3S Web of Conferences, vol 9, 11012. doi: 10.1051/e3sconf/20160911012
- Gatabin C, Touze G, Imbert C, Guillot W, Billaud P (2008) ESDRED project, module 1-selection and THM characterization of the buffer material. In: Proceedings of the international conference underground disposal unit design & emplacement processes for a deep geological repository, PragueGoogle Scholar
- Schanz T (2016) Transient boundary conditions in the frame of THM-processes at nuclear waste repositories. In: 3rd European conference on unsaturated soils – E-UNSAT 2016. E3S Web of Conferences, vol 9, 03001. doi: 10.1051/e3sconf/20160903001