This paper presents the results of a discrete fracture network modelling for the non-sorbing tracer migration experiments, which were conducted in the fractured rock at the Kamaishi mine. A newly developed in-plane heterogeneity model, which can address the channelling effects within a fracture, and the matrix diffusion model, which can simulate the retardation time due to the matrix diffusion adjacent to fracture were applied in this study. As a result, the matrix diffusion model better reproduces the general shape of breakthrough curves. The transport aperture At was approximately one order of magnitude larger than the hydraulic aperture Ac derived from the cubic law.
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Uchida, M., Sawada, A. Discrete Fracture Network Modelling of Tracer Migration Experiments at the Kamaishi Mine. MRS Online Proceedings Library 353, 387–394 (1994). https://doi.org/10.1557/PROC-353-387