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Report No.

Investigations of flow and transport in fractured crystalline rocks at the Mizunami Underground Research Laboratory

Teklu, H.*; Elena, K.*; Wang, Y.*; Iwatsuki, Teruki ; Ozaki, Yusuke 

In this study, the time variation of hydraulic head and Cl concentration during excavation of Closure Test Drift at the depth of 500m in Mizunami Underground Research Laboratory is simulated. The equivalent continuous porous medium model converted from Discrete Network Model is used to consider the highly heterogeneous feature of fractured rock. The simulated change in hydraulic head shows the good accordance with the observed data. However, the estimated time variations of Cl concentration show the slight change and can not reproduce the observed data. The improvement of prediction of change in Cl concentration is one of future task. These results are parts of results of Decvalex2019 Task C.



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