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結晶質岩を対象とした坑道掘削における湧水抑制対策の計画策定と施工結果に関する考察

Studies on planning and conducting for reducing water inflow due to underground construction in crystalline rock

見掛 信一郎 ; 山本 勝; 池田 幸喜; 杉原 弘造; 竹内 真司; 早野 明  ; 佐藤 稔紀  ; 武田 信一; 石井 洋司; 石田 英明; 浅井 秀明; 原 雅人*; 久慈 雅栄*; 南出 賢司*; 黒田 英高*; 松井 裕哉 ; 鶴田 忠彦  ; 竹内 竜史  ; 三枝 博光; 松岡 稔幸; 水野 崇   ; 大山 卓也 

Mikake, Shinichiro; Yamamoto, Masaru; Ikeda, Koki; Sugihara, Kozo; Takeuchi, Shinji; Hayano, Akira; Sato, Toshinori; Takeda, Shinichi; Ishii, Yoji; Ishida, Hideaki; Asai, Hideaki; Hara, Masato*; Kuji, Masayoshi*; Minamide, Kenji*; Kuroda, Hidetaka*; Matsui, Hiroya; Tsuruta, Tadahiko; Takeuchi, Ryuji; Saegusa, Hiromitsu; Matsuoka, Toshiyuki; Mizuno, Takashi; Oyama, Takuya

現在、瑞浪超深地層研究所において進めている研究坑道掘削工事では、坑道掘削に先立ちボーリング調査を行い、掘削範囲の地質や地下水状況を把握したうえで坑道を掘削している。調査の結果、深度200m付近の換気立坑側や深度300m研究アクセス坑道で大量湧水が発生する可能性が高いことがわかった。このため坑道掘削時の湧水を抑制する技術として、坑道掘削に先立ち掘削範囲周辺の割れ目にセメントを注入する工法(プレグラウチング)を行った。本報告書は、プレグラウチングの計画と実施過程で得られた技術的知見を取りまとめたものである。

The Mizunami Underground Research Laboratory (MIU), one of the main facilities in Japan for research and development of the technology for high-level radioactive waste disposal, is under construction in Mizunami City. In planning the construction, it was necessary to get reliable information on the bedrock conditions, specifically the rock mass stability and hydrogeology. Therefore, borehole investigations were conducted before excavations started. The results indicated that large water inflow could be expected during the excavation around the Ventilation Shaft at GL-200m and GL-300m Access/Research Gallery. In order to reduce water inflow, pre-excavation grouting was conducted before excavation of shafts and research tunnels. Grouting is the injection of material such as cement into a rock mass to stabilize and seal the rock. This report describes the knowledge and lessons learned during the planning and conducting of pre-excavation grouting.

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