Counter-measure for the water inflow for the construction of the Mizunami Underground Research Laboratory; Overview of the pilot borehole investigations

Takeuchi, Shinji; Hayano, Akira  ; Ikeda, Koki; Mikake, Shinichiro ; Hara, Masato; Yamamoto, Masaru; Tsuruta, Tadahiko  ; Nakamata, Kiminori; Takeuchi, Ryuji  ; Saegusa, Hiromitsu; Mizuno, Takashi   ; Oyama, Takuya ; Uchida, Masahiro; Kuji, Masayoshi; Sugihara, Kozo

The results from the pilot borehole investigations conducted at FY2006 at Mizunami Underground Research Laboratory are presented. The investigations are carried out to obtain various information for the planning of water treatment facility, planning for the grouting and revision for the construction design by understanding the geological environment below the excavating area. From the result of the investigations, important section of the inflow water and hydrochemical composition which should be treated in the water treatment facility have been obtained. Required informations on the planning for the future construction of MIU are addressed.