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Report No.
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Changes in water inflow and water pressure response after earthquakes in Mizunami Underground Research Laboratory

Horiuchi, Yasuharu; Mikake, Shinichiro ; Sato, Toshinori  

Japan Atomic Energy Agency is pursuing an underground research project, called the Mizunami Underground Research Laboratory (MIU) Project focused on crystalline rock environment, in order to establish scientific and technological basis for geological disposal of High-level Radioactive Wastes. After the 2011 Great East Japan Earthquake, increased water inflow in the MIU and changes in groundwater pressure in the monitoring boreholes around the MIU have been observed. This report describes knowledge obtained through effect assessment of the pre-excavation grouting performed to reduce water inflow and observation of changes in water pressure response after the earthquakes.

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