2013 Fiscal Year Final Research Report
AE measurements in deep South African gold mines: Phase II - monitoring of rock mass damage by underground cavities and prediction of rockbursts
| Project/Area Number |
21246134
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Earth system and resources enginnering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
MORIYA Hirokazu 東北大学, 大学院・工学研究科, 准教授 (60261591)
LEI Xinglin 独立行政法人産業技術総合研究所, 地圏資源環境研究部門, 主任研究員 (70358357)
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| Co-Investigator(Renkei-kenkyūsha) |
SATOH Takashi 独立行政法人産業技術総合研究所, 活断層・地震研究センター, 主任研究員 (90357161)
OGASAWARA Hiroshi 立命館大学, 理工学部, 教授 (40213996)
KAWAKATA Hironori 立命館大学, 理工学部, 教授 (80346056)
YABE Yasuo 東北大学, 大学院・理学研究科, 准教授 (30292197)
IDE Satoshi 東京大学, 大学院・理学研究科, 教授 (90292713)
IGARASHI Toshihiro 東京大学, 地震研究所, 助教 (10334286)
SANO Osamu 東京大学, 地震研究所, 名誉教授 (20127765)
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| Project Period (FY) |
2009-04-01 – 2014-03-31
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| Keywords | 地殻工学 / アコースティック・エミッション |
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| Research Abstract |
A dense, 3-dimensional array of AE sensors with about 100-m spread was deployed in the rock mass near a mining stope at about 1-km depth in a South African gold mine. The area contained multiple geological faults. A huge number of microfractures were occurring almost exclusively either in the great proximity of fracture planes of geological faults or in the zone of high-differential stress ahead of the mining front. Relative abundance of small events was to a similar extent to natural earthquakes in the latter, but was extreme in the former. It has turned out that the latter population consists of several, discrete, large-scale (a few tens of meters), tabular clusters of a few meters thickness. Laboratory tests of rock samples from the mine showed that weak foliation affects the microfractures. Also, complexities of microfracture activity and the eventual through-going fracture were both shown to be affected by the orientation of the foliation with respect to the principal stress axis.
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Research Products
(24 results)
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[Journal Article] Detection of mining-inducced fractures associated with stress perturbation around a stope in Ezulwini gold mine, South Africa, by using AE events2013
Author(s)
H. Moriya, M. Naoi, M. Nakatani, O. Murakami, T. Kgarume, A. K. Ward, R. Durrheim, J. Philipp, Y. Yabe, H. Kawakata, and H. Ogasawara
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Journal Title
Proc. 6th International Symposium on in-situ rock stress
Volume: 6
Pages: 567-602
Peer Reviewed
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[Journal Article] Frequency-Magnitude Distribution of -3.7 <= Mw <= 1 Mining-Induced Earthquakes around a Mining Front and b-Value Invariance with Post-Blast Time2013
Author(s)
Naoi, M., M. Nakatani, S. Horiuchi, Y. Yabe, J. Philipp, T. Kgarume, G. Morema, S. Khambule, T. Masakale, L. Ribeiro, K., Miyakawa, A. Watanabe, K. Otsuki, H. Moriya, O. Murakami, H. Kawakata, N. Yoshimitsu, A. Ward, R. Durrheim, H. Ogasawara
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Journal Title
DOI
Peer Reviewed
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[Journal Article] Detection of mining-induced fractures around a stope in Ezulwini gold mine, South Africa, by using AE events with similar waveforms2012
Author(s)
Moriya, H., M. Naoi, M. Nakatani, T. Kgarume, A.K. Ward, R. Durrheim, P. Joachim, Y. Yabe, H. Kawakata, H. Ogasawara
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Journal Title
Progress in Acoustic Emission
Volume: 16
Pages: 181-186
Peer Reviewed
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[Journal Article] Observation of numerous aftershocks of an Mw 1.9 earthquake with and AE network installed in a deep gold mine in South Africa2009
Author(s)
Yabe, Y., J. Phillip, M. Nakatani, G. Morema, M. Naoi, H. Kawakata, T. Igarashi, G.Dresen, H. Ogasawara, and JAGUARS
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Journal Title
Earth Planets Space
Volume: 61
Pages: e49-e52
Peer Reviewed
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