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- Material Type
- 規格・テクニカルリポート類
- Title
- Author/Editor
- 柴野 一則尾留川 剛安江 健一舟木 泰智操上 広志
- Publication Date
- 2008-06
- Publication Date (W3CDTF)
- 2008
- Alternative Title
- Prediction of groundwater flow rate into shaft to the depth of 50m
- Periodical title
- JAEA-Research 2008-033
- Target Audience
- 一般
- Note (General)
- 出版タイプ: NA本報告では、立坑掘削に先立って立坑近傍に掘削した深度30m程度の数本の浅層ボーリング孔を利用したコア観察や透水試験結果を用いて、表層付近の水理地質構造モデルを構築し、換気立坑を対象とした掘削解析を実施した。解析結果を深度50mまでの実測の湧水量と比較して表層付近の水理地質構造モデルや立坑周辺に設置した止水壁が十分な性能を持つことを検証した。その結果、止水壁が十分に機能していること,止水壁より下部の掘削においては声問層の新鮮部の透水係数が湧水量に対して直接的に影響を及ぼすことが明らかとなった。本報告のような簡易なモデルでの予測解析は、地下施設の施工への反映に対して有益である。The hydrogeological model of shallow zone was built by using the data of core observation and permeability tests in the shallow boreholes drilled prior to the shaft excavation. Then, groundwater flow analysis of shaft excavation was performed using the hydrogeological model. By making a comparison between inflow rate into the shaft obtained by the analysis and measured inflow rate to the depth of 50m, the hydrogeological model and the performance of the cut-off wall established around the shaft were evaluated. The prediction analysis showed that the cut-off wall was the adequate performance and the hydraulic conductivity of fresh rock in the Koetoi Formation directly influenced the inflow rate below the cut-off wall. The simplified model in the report is efficient to reflect the excavation execution of the underground facility.
- Source
- /JAEA-Research-2008-033.pdf (fulltext)