A migration experiment with the objective to investigate the existence of a connected pore system in undisturbed rock has been performed in the Stripa mine at the 360 m-level.
Since all three tracers (Cr-EDTA, I– and Uranine) that were used in the experiment migrated at least 11 cm into the rock under a three month period, this experiment indicates the existence of a connected pore system in “undisturbed” rock.
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concentration in liquid mol/m3
injection concentration mol/m3
diffusivity in water in pores m2/s
hydraulic conductivity m/s
radial distance m
contact time s
radial velocity m/s
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Birgersson, L., Neretnieks, I. Diffusion in the Matrix of Granitic Rock. Field Test in the Stripa Mine. MRS Online Proceedings Library 11, 519 (1981). https://doi.org/10.1557/PROC-11-519