Determination of the in situ hydraulic parameters of the Callovo–Oxfordian clay rock in a long-term hydraulic interference testing at Andra's Underground Research Laboratory (CMHM)
Jean Croisé,Gerhard Mayer,and Rémi De La Vaissière
In the context of geological repositories for radioactive waste, hydraulic packer testing has been performed in deep boreholes located at the edge of the Northern Alpine Molasse Basin. Our presentation will give an overview on methodologies and workflows with emphasis on the numerical design and analysis techniques applied to the hydraulic packer tests. The applied methodology provided high-quality results and reliable estimates of the hydraulic conductivities in the low-permeability rocks.
In the context of geological repositories for radioactive waste, hydraulic packer testing has been performed in deep boreholes located at the edge of the Northern Alpine Molasse Basin. Our presentation will give an overview on methodologies and workflows with emphasis on the numerical design and analysis techniques applied to the hydraulic packer tests. The applied methodology provided high-quality results and reliable estimates of the hydraulic conductivities in the low-permeability rocks.
The talk presents highlights from the generic identification and evaluation of processes for co-disposal of high-level radioactive waste and low- and intermediate-level radioactive waste in clay rock, crystalline rock and salt rock in the context of the German site-selection process for a deep geological repository for high-level radioactive waste on behalf of the Federal Office for the Safety of Nuclear Waste Management (BASE).
The determination of flow parameters in a low-permeability clay was made possible by long-term observation pressure and flow rate data and the consideration of the precise experimental set-up composed of two parallel boreholes with three observation sections each. Using 3D modelling and properly specified geometry and conditions, it has been possible to determine the water flow properties of the Callovo–Oxfordian Clay at the decameter scale, which is a unique determination in tight clay.
The determination of flow parameters in a low-permeability clay was made possible by long-term...