Hydrogeological investigations in Mizunami Underground Research Laboratory Project; Hydrogeological interpretation based on the long term pressure monitoring

Keya, Hiromichi; Takeuchi, Ryuji  ; Toya, Naruhisa; Sato, Atsuya

The Mizunami Underground Laboratory (MIU) Project has Construction phase (Phase II) now. In the study on the hydrogeological that receives the object of Phase II, it aims at "Grasp of the water flow place according to drilling at shafts" and "Confirmation and update of the validity of the hydrogeological model's construction at Phase I". And one hydrogeological research is long term hydraulic pressure monitoring. It is extremely important to understand water conducting feature. In this report, it introduces the method of understanding water conducting feature from the difference of the water pressure response based on the long term hydro-pressure monitoring result when drilling at shafts.