Experiments to estimate gas intrusion in Callovo-oxfordian argillites

摘要: Abstract Gases, especially hydrogen, will be generated by corrosion and radiolysis of high radioactive waste containers in deep geological repositories. Pressure build up resulting from those long-term processes may create a risk barrier fracturation potential creation preferential pathways for radionuclide migration. Good knowledge gas transfer mechanisms the host rock formations is therefore necessary. The present work focuses on Callovo-oxfordian argillites Bure (Meuse, France) underground laboratory operated Andra, French national agency management. Its goal to understand pore structure that formation as first step towards characterizing modelling intrusion transfer. Our approach was use various techniques combination. Firstly, mercury experiments were made. Besides supplying classical size distribution curve, they bear some resemblance with real-life problem since (a non-wetting phase) invades porous like would. Secondly, water vapor sorption curve measured submitting initially dry samples atmospheres increasing content. Comparison intrusion/water vapour data sets yielded information connectivity structure. Thirdly, permeability specifically designed set-up, using helium an acceptable (non-detonating) substitute hydrogen. main observation existence large Klinkenberg effect. Finally, all available used constrain multi-scale models network XDQ technique. predict properties material at saturation levels.