Status of grouting to reduce groundwater inflow into deep shafts and galleries in the Mizunami Underground Research Laboratory, Japan
佐藤 稔紀; 見掛 信一郎; 小林 伸司*; 辻 正邦*
Sato, Toshinori; Mikake, Shinichiro; Kobayashi, Shinji*; Tsuji, Masakuni*
Japan Atomic Energy Agency is operating Mizunami Underground Research Laboratory project focusing on crystalline rock. Grouting for reducing water inflow is an essential countermeasure technology utilized during construction of underground facilities. Pre-excavation grouting and post-excavation grouting using Ordinary Portland cement, super-fine Portland cement and liquid-type colloidal silica were performed to investigate their performance as countermeasures for reducing groundwater inflow at many locations in the shafts and galleries in the laboratory. The results show that pre-excavation grouting successfully attained the target hydraulic conductivity of 2 Lu for Ordinary Portland cement and 0.2 Lu for super-fine Portland cement using criteria of Lugeon value and changing W/C. Liquid-type colloidal silica was able to drastically lower the hydraulic conductivity of 0.29 Lu and seemed to be stable for water pressures of at least 5 MPa and to be important material used in deep underground.
使用言語 : English
掲載資料名 : Proceedings of 8th Asian Rock Mechanics Symposium (ARMS-8) (USB Flash Drive)
ページ数 : 10 Pages
発行年月 : 2014/10
出版社名 :
発表会議名 : 8th Asian Rock Mechanics Symposium (ARMS-8)
開催年月 : 2014/10
開催都市 : Sapporo
開催国 : Japan
特許データ :
論文URL :
キーワード : no keyword
使用施設 :
広報プレスリリース :
: 大深度地下において坑道への湧水を抑制する(瑞浪超深地層研究所の施工対策技術について)[/]
受委託・共同研究相手機関 : 清水建設
登録番号 : BB20140834
抄録集掲載番号 : 42001488
論文投稿番号 : 15116
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