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dc.contributor.author
Zhang, Guang
dc.contributor.author
Wu, Shun-chuan
dc.contributor.author
Zhang, Shihuai
dc.contributor.author
Guo, Pei
dc.date.accessioned
2023-06-09T09:06:21Z
dc.date.available
2023-05-11T17:06:43Z
dc.date.available
2023-05-12T09:38:39Z
dc.date.available
2023-06-09T09:06:21Z
dc.date.issued
2023-02-23
dc.identifier.issn
1000-7598
dc.identifier.other
10.16285/j.rsm.2022.6106
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/611698
dc.description.abstract
Pillar burst is one of the most frequent dynamic disasters in deep mining, which poses a serious threat to safe and efficient mining. In this study, the failure mechanisms and precursors of pillar burst are investigated by active ultrasonic survey and passive acoustic emission (AE) monitoring in uniaxial compression tests on Zigong red sandstone. Combining active and passive AE monitoring data, a P-wave velocity tomography inversion is performed to analyse the temporal and spatial variations of P-wave velocity structure during the sample failure. Results show that the velocity structure of the sandstone sample is highly heterogeneous during loading, and a low-velocity zone emerges, within which most of the acoustic emission events are present. The dispersion of P-wave velocity reflects the global variations of P-wave velocity. It changes drastically during the peak stage, and increases with the ongoing loading. The AE events differ significantly between the pre-peak and post-peak stages. In the pre-peak stage, AE events are randomly distributed in the sample, while in the post-peak stage, clustered AE events are identified. In addition, it is found that using the homogeneous velocity structure for AE events location results in a higher positioning error. The decreasing b value before the eventual failure of the sample indicates that large-scale crack activities are intensified, leading to the increase of sample heterogeneity, which also proves the necessity of applying the heterogeneous velocity structure for AE events location. The research results can be further used for on-site pillar stability monitoring, and the periodic P-wave velocity tomography provides precursors for pillar bursts.
en_US
dc.language.iso
en
en_US
dc.publisher
Chinese Academy of Sciences
en_US
dc.subject
acoustic emission
en_US
dc.subject
ultrasonic wave
en_US
dc.subject
tomography
en_US
dc.subject
pillar burst
en_US
dc.subject
uniaxial compression
en_US
dc.title
P-wave velocity tomography and acoustic emission characteristics of sandstone under uniaxial compression
en_US
dc.type
Journal Article
dc.date.published
2023-02-23
ethz.journal.title
Rock and Soil Mechanics = 岩土力学 = Yan tu li xue
ethz.journal.volume
44
en_US
ethz.journal.issue
2
en_US
ethz.pages.start
483
en_US
ethz.pages.end
496
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Wuhan
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2023-05-11T17:06:47Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2023-06-09T09:06:22Z
ethz.rosetta.lastUpdated
2023-06-09T09:06:22Z
ethz.rosetta.versionExported
true
ethz.COinS
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