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Report No.

Development of grouting technologies for geological disposal of high level waste in Japan, 2; Hydrogeological descriptive modeling by discrete fracture network in crystalline rock mass test site

Tanaka, Tatsuya*; Bruines, P.*; Abumi, Kensho*; Hashimoto, Shuji*; Kuzuha, Yuji; Onishi, Yuzo*

This study aims to establish grouting techniques and evaluation of the effects of grouting in the geological environment of crystalline rock. A hydrogeological model has been generated using discrete fracture networks based on the data obtained by the short-borehole investigation campaign performed at at Grimsel test site in Switzerland to support the design of planned in-situ grouting test. The equivalent porous media with the consideration of hydraulic heterogeneity has been created from the DFN (Discrete Fracture Network) in order to be provided for the simulation of the grout injection process. Uncertainties and remaining issues associated with the assumption in interpreting the data and its modeling were addressed in a systematic way.



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