In situ experiments for the determination of macro-permeability and RN-migration in faulted rock formations such as the oolithic iron ore in the Konrad Mine.
Main subjects of the hydrogeological feasibility studies for radioactive waste disposal in the Konrad Mine (FRG) were the identification of water pathways - existing or in future possible ones - and the determination of size and extension of these pathways. Due to extreme dryness of the rock mass and the absence of any open water flow in the mine advanced investigation techniques had to be found for measuring the macro-permeability. Rock mass properties especially to be considered were elastoplasticity and hydraulic anisotropy. So far, good results were achieved by pressure pulse tests in boreholes and ventilation tests in a mine gallery. It was proved that the undisturbed rock mass is almost impermeable. Only in the near field of mine workings where the primary stress field is disturbed the rock can be regarded to a certain extent as permeable
