Current status and next five-year plan of R and D activities of Mizunami Underground Research Laboratory

超深地層研究所計画の現状と5か年の計画概要

見掛 信一郎 ; 岩月 輝希  ; 松井 裕哉 ; 笹尾 英嗣   

Mikake, Shinichiro; Iwatsuki, Teruki; Matsui, Hiroya; Sasao, Eiji

超深地層研究所計画では、現在深度500m研究アクセス北坑道において再冠水試験を進めており、坑道周辺のモニタリングにより水理地質環境の回復能力を評価していく予定である。また、深度500m研究アクセス南坑道においては、プレグラウチングとポストグラウチングを組み合わせて実施しており、湧水抑制技術の実証を進めている。本報告は、これらの現状と計画の概要を紹介した内容である。

The MIU (Mizunami underground research laboratory project) has proceeded in three overlapping phases, "Phase I: Surface-based investigation", "Phase II: Construction" and "Phase III: Operation". The construction of research galleries in the MIU has been completed to the GL-500 m depth. The research activities in Phase III have been conducted in the underground since 2010. Current R and D activities include a gallery closure test on the -500m level to study recovery processes in the geological environment around a gallery after it has been backfilled and for the development of long-term monitoring technology, a post-excavation grouting experiment to demonstrate the feasibility of impermeable grout technology, and a mass transport experiment. This report introduces the next five years R&D plan and its current status.