Study on applicability of existing grouting technology at Mizunami URL, Contract study with METI

Matsui, Hiroya ; Takeuchi, Shinji; Iyatomi, Yosuke ; Sugihara, Kozo

This study carried out to confirm the applicability of existing grouting technology for reducing of inflow and find the investigation methods as a part of contract study with METI. The site, where called refuge niche, was located at 200 m sub-stage in Mizunami URL. Pre-excavation grouting was performed before excavation of refuge niche and the various investigations/modeling were carried out for pre-excavation grouting area around refuge niche. The results suggested that existing grouting technology is applicable to reduce inflow and the permeability in grouted area may decrease max, two order of magnitudes.