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Abandoned roadways aged up to 50 years observed in Kushiro Coal Mine, Japan

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Title: Abandoned roadways aged up to 50 years observed in Kushiro Coal Mine, Japan
Authors: Fujii, Yoshiaki Browse this author →KAKEN DB
Sugawara, T. Browse this author
Kodama, J. Browse this author
Ishijima, Y. Browse this author
Kiyama, T. Browse this author
Takada, M. Browse this author
Ishihara, Y. Browse this author
Kumakura, S. Browse this author
Narita, T. Browse this author
Sawada, M. Browse this author
Nakata, E. Browse this author
Keywords: case studies
coal mines
field measurements
lab testing
nuclear repository
Issue Date: Sep-2011
Publisher: CRC Press (Taylor & Francis Group)
Citation: Harmonising Rock Engineering and the Environment, ISBN: 978-0415804448
Start Page: 975
End Page: 978
Abstract: 95 abandoned old roadways up to 50 years old and 300 m deep were observed at Kushiro Coal Mine. Large plastic deformations as roof deflection and/or floor heave closed most roadways although a few roadways were remain open. Such in-situ measurements as Rayleigh wave velocity, permeability etc. were carried out. Rayleigh wave velocity in the closed roadway was approx. half the virgin rock mass. Permeability of closed roadway was 40 times greater than that for virgin rock mass. This suggests that 1/40 sealability can be expected even a rock cavern in clastic rocks completely collapsed. This would be much better than rock cavern in crystalline rocks in which much less sealability is expected when completely collapsed.
Description: 12th ISRM International Congress on Rock Mechanics (Beijing, China, 18-21 October 2011)
Type: bookchapter (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤井 義明

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