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Studies on design of the engineered barrier system and mechanical stability of rock based on surfaced-based investigation of the Horonobe URL project

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青柳 茂男; 棚井 憲治 ; 松井 裕哉 ; 川上 進; 油井 三和

Aoyagi, Shigeo; Tanai, Kenji; Matsui, Hiroya; Kawakami, Susumu; Yui, Mikazu

幌延URLプロジェクトの地上からの調査段階を対象として,第2次取りまとめにおける手法に基づいて実施した処分場設計について,人工バリアの設計,岩盤の力学安定性評価を中心に報告する。その目的は,(1)堆積岩における地上からの調査の結果に基づいた人工バリア設計や処分施設の全体的な設計手順や方法論の構築,(2)地上からの調査に基づく研究を通して幌延深地層研究所の建設段階において解決されるべき課題の抽出,の2点である。検討結果として,各分野の相互関連を考慮し改訂した処分場の設計フローを示した。さらに,幌延の地質環境における緩衝材とオーバーパックの仕様は,第2次取りまとめにおける仕様が適用できるということ,幌延の深度450mにおける処分孔周辺岩盤は第2次取りまとめより長期的に安定であろうということが知見として得られた。

This paper presents the design of the disposal design based on surface-based investigations in Horonobe URL project with a focus on the engineered barrier system (EBS) and the estimation of mechanical stability of rock. The purpose of this study is as follows.[1]Establishment of the overall design methodology on engineered barrier system and repository based on the results of surface-based investigation in sedimentary rock.][2]Extraction of issues to be solved in the construction phase of URL through studies based on surface-based investigation.]The applied methods on this study are based on the second progress report (H12)(1999) published by JNC. As results of this study,the design flow shown in H12 report is revised under the consideration of correlation with each field. The typical specification of buffer and overpack (iron) in the geological environment in Horonobe are the same specification as H12 report. The rock around a dry pit at the depth of 450m in Horonobe is expected more stable in long-term than SR-C in H12 report.

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