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Effects of confining pressure on the permeability of three rock types under compression

IJRMMS.65.2014.49-61.pdf4.54 MBPDF見る/開く

タイトル: Effects of confining pressure on the permeability of three rock types under compression
著者: Alam, A.K.M. Badrul 著作を一覧する
Niioka, Masaki 著作を一覧する
Fujii, Yoshiaki 著作を一覧する
Fukuda, Daisuke 著作を一覧する
Kodama, Jun-ichi 著作を一覧する
キーワード: Confining pressure
発行日: 2014年 1月
出版者: Elsevier
誌名: International Journal of Rock Mechanics and Mining Sciences
巻: 65
開始ページ: 49
終了ページ: 61
出版社 DOI: 10.1016/j.ijrmms.2013.11.006
抄録: Triaxial tests were conducted on three different rocks, under confining pressures of 1–15 MPa at 295 K using an ultra-compact triaxial cell. The samples were held for 24 h under the target consolidation pressure, and then constant strain-rate compression was applied measuring permeability. The structural changes were measured by thin section image analysis and micro-focus X-ray computed tomography. For the Shikotsu welded tuff, the permeability decreased monotonously with axial compression, mainly due to pore collapse. For the Kimachi sandstone, the permeability first decreased with increasing axial stress, then began to increase when the total lateral strain recovered its value before the application of confining pressure, and then maintained an almost constant value in the post-peak region. The minimum and final permeability decreased with increasing confining pressure mainly due to compaction and large plastic deformation of clay cementing materials. For the Inada granite, the tendency of permeability change during axial compression was almost the same as for the Kimachi sandstone. The final permeability was larger than that before compression, and the permeability decreased with smaller confining pressure mainly due to a decrease in the number and width of rupture planes and the absence of axial cracks from biotite. The permeability, however, increased under larger confining pressures mainly due to the formation of subrupture planes caused by the high stress concentration at the rough and stiff rupture plane under large confining pressure.
Relation (URI):
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 藤井 義明


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