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Report No.

Strength and impermeability recovery of siliceous mudstone from complete failure

Sugita, Yutaka ; Sanada, Masanori; Fujita, Tomoo ; Hashiba, Kimihiro*; Fukui, Katsunori*; Okubo, Seisuke*

Radionuclide migration can be undesirably increased by weakening the mechanical properties of a rock mass in the excavated disturbed zone (EDZ) around the tunnels of a geolical disposal facility for high level radioactive waste. Laboratory testing of loading stress and loading time on failed siliceous mudstone specimens has identified the potential for the long-term recovery of the strength and impermeability of the rock mass in the EDZ.



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