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- Material Type
- 規格・テクニカルリポート類
- Author/Editor
- 杉田 裕真田 祐幸相澤 隆生伊東 俊一郎
- Publication Date
- 2012-02
- Publication Date (W3CDTF)
- 2012
- Alternative Title
- Development of a simplified seismic tomography survey system
- Periodical title
- JAEA-Research 2011-043
- Target Audience
- 一般
- Note (General)
- 出版タイプ： NA地下深部で坑道を掘削する際の坑道周囲における変化を捉えるため、坑道の掘削の進捗に合わせて繰り返し弾性波トモグラフィ調査を行うための新たな簡易弾性波トモグラフィ調査システムを開発した。これは、ボーリング孔の壁面打撃用のハンマーを組み込んだ起振源、ボーリング孔内埋設型の受振器から構成され、弾性波を発生させる起振のエネルギーにはメタン等の可燃性ガスの存在を考慮して圧縮空気を利用している。開発したシステムを水平坑道の掘削影響試験領域に適用し、坑道掘削時における調査領域における弾性波速度の変化を捉えることが可能となり、結果をトモグラフィ画像として処理を行った。この結果、掘削影響領域のモニタリング技術としての適用性を確認した。A simplified seismic velocity survey system was developed for the repeat performance of surveys in conjunction with tunnel excavation, to monitor the various changes that occur in a rock mass around tunnels or galleries as they are excavated in the deep underground. The simplified seismic velocity survey system developed consists of a hammer to transfer seismic energy to the borehole wall and receivers installed and anchored in the borehole, and then backfilled. The hammer is operated with compressed air, necessitated by the potential presence of flammable gas such as methane. The system developed was used in the EDZ Experiment in a horizontal tunnel in the Horonobe URL. Changes in seismic velocity were monitored during and after excavation of the tunnel and the tomograms obtained are high quality. These results show that the system developed can provide the information needed to monitor the development and the variations in an EDZ.
- Source
- /JAEA-Research-2011-043.pdf （fulltext）