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

Yoshiaki, Fujii; Yoji, Ishijima; Yoshihisa, Ichihara; Tamotsu, Kiyama; Satoshi, Kumakura; Michihiko, Takada; Takayuki, Sugawara; Takashi, Narita; Jun-ichi, Kodama; Masataka, Sawada; Eiji, Nakata

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

Yoshiaki, Fujii; Yoji, Ishijima; Yoshihisa, Ichihara et al.

International Journal of Rock Mechanics and Mining Sciences, 2011, 48(4), 585-596

Permalink : https://hdl.handle.net/2115/45466

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アクセス権	open access
URI	https://hdl.handle.net/2115/45466
タイトル	Mechanical Properties of Abandoned and Closed Roadways in the Kushiro Coal Mine, Japan
著者	Yoshiaki, Fujii ; Yoji, Ishijima ; Yoshihisa, Ichihara ; Tamotsu, Kiyama ; Satoshi, Kumakura ; Michihiko, Takada ; Takayuki, Sugawara ; Takashi, Narita ; Jun-ichi, Kodama ; Masataka, Sawada ; Eiji, Nakata
e-Rad_Researcher 70192309 著者名 Yoshiaki, Fujii
著者名 Yoji, Ishijima
著者名 Yoshihisa, Ichihara
著者名 Tamotsu, Kiyama
著者名 Satoshi, Kumakura
著者名 Michihiko, Takada
著者名 Takayuki, Sugawara
著者名 Takashi, Narita
e-Rad_Researcher 70241411 著者名 Jun-ichi, Kodama
著者名 Masataka, Sawada
著者名 Eiji, Nakata
言語	英語
キーワード	EDZ
	Permeability
	Rayleigh wave velocity
	Old roadways
	Medium-hard clastic rocks
発行日	2011-06
出版者	Elsevier
収録物名	International Journal of Rock Mechanics and Mining Sciences
巻(号)	48(4)
ページ	585-596
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	1365-1609
NCID	AA1116472X
関連情報	URI http://www.sciencedirect.com/science/journal/13651609
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.ijrmms.2011.04.012