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Mechanical Properties of Abandoned and Closed Roadways in the Kushiro Coal Mine, Japan

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Title: Mechanical Properties of Abandoned and Closed Roadways in the Kushiro Coal Mine, Japan
Authors: Yoshiaki, Fujii Browse this author →KAKEN DB
Yoji, Ishijima Browse this author
Yoshihisa, Ichihara Browse this author
Tamotsu, Kiyama Browse this author
Satoshi, Kumakura Browse this author
Michihiko, Takada Browse this author
Takayuki, Sugawara Browse this author
Takashi, Narita Browse this author
Jun-ichi, Kodama Browse this author →KAKEN DB
Masataka, Sawada Browse this author
Eiji, Nakata Browse this author
Keywords: EDZ
Rayleigh wave velocity
Old roadways
Medium-hard clastic rocks
Issue Date: Jun-2011
Publisher: Elsevier
Journal Title: International Journal of Rock Mechanics and Mining Sciences
Volume: 48
Issue: 4
Start Page: 585
End Page: 596
Publisher DOI: 10.1016/j.ijrmms.2011.04.012
Abstract: The objective of this research is to clarify the mechanical properties and self-healing ability of Excavation Damaged Zone (EDZ) around rock caverns in clastic rock. Observations of nearly 100 closed roadways up to 50 years old, which can be regarded as very severe EDZs with no initial sealability and are up to 300 m deep in clastic rock, were made at Kushiro Coal Mine, Japan, to accomplish the objective. Most old roadways were closed, though a few remain open. Closure of old roadways was mainly due to roof deflection and/or floor heave. Large plastic deformations dominated; however, severe fractures were seldom observed in closed old roadways. Rayleigh wave velocity and hydraulic conductivity in the closed old roadways were in the range of 0.3 - 1.2 km/s and 5 x 10^[-7] - 1 x 10^[-7]m/s, respectively, and those in EDZ and EdZ (Excavation disturbed Zone) around recently excavated roadways were 1.1 - 1.8 km/s and 1 x 10^[-8] - 5 x 10^[-8] m/s, respectively. The extent of EDZ around the present tailgate was in the range of 1 m to 5 m. Mechanical excavation and prevention from water are suggested as the key points for long-term maintenance of rock repositories. Pressurization from inside the cavern to decrease the permeability of EDZ is proposed for maintenance of rock repositories in medium-hard clastic rock masses at similar depths for long periods.
Type: article (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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