Time-Dependent Monitoring of Seismic Wave Velocity Variation Associated with Three Major Seismic Events at a Deep, Narrow-Vein Mine

Afrouz, Setareh Ghaychi; Westman, Erik; Dehn, K. K.; Weston, Ben

doi:10.1007/s42461-020-00327-1

Cited by 2 publications

(2 citation statements)

References 30 publications

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“…However, there are different findings from other mines. For instance, using passive seismic tomography, Afrouz et al (2021) analysed three seismic events in a mine and found that the P-wave velocity did not increase in the vicinity of the hypocenter for any of the three events. For two of the events, the velocity deceased in the week prior to the event (by 2.1% and 0.8%), and for the third event, the velocity was essentially unchanged from the week prior.…”

Section: Field Resultsmentioning

confidence: 99%

“…For two of the events, the velocity deceased in the week prior to the event (by 2.1% and 0.8%), and for the third event, the velocity was essentially unchanged from the week prior. Afrouz et al (2021) explained that a potential reason was that new fractures might be developing within the highly stressed rock mass, resulting in either no increased velocity or a reduction in velocity at the hypocenter prior to the seismic event. In addition, they reported that the three seismic events might be due to the different failure mechanisms, since Events 1 and 3 occurred suddenly followed by several minor events, while Event 2 triggered fewer subsequent minor events but was followed by a major event 17 days later.…”

Section: Field Resultsmentioning

confidence: 99%

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Characteristic Impedance and Its Applications to Rock and Mining Engineering

et al. 2023

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The characteristic impedance of a rock is defined as the product of the sonic velocity and the density of the rock. Based on previous studies, this article finds that: (1) For an intact rock, its characteristic impedance is a comprehensive physical property, since it is closely related with strengths, fracture toughness, Young’s modulus, and Poisson’s ratio. (2) For rock masses, their characteristic impedances either increase markedly or slightly with increasing depth. (3) The bursts of intact rocks in laboratory are dependent on their characteristic impedances to a great extent, and strong rock bursts happen mostly in the rocks with large characteristic impedance. (4) Rock burst occurrence in tunnel and mines has a close relation with the characteristic impedances of the rocks. (5) Laboratory experiments on different rock samples show that seismic velocity increases as applied stress rises, and field monitored results from coal mines indicate that in the areas where rock bursts happened, the seismic velocity was increasing markedly before or during the bursts. (7) Drillability of rock depends on the characteristic impedance of the rock and the rock with larger impedance has lower drillability or lower penetration rate. (8) The potential applications of characteristic impedance include evaluation and classification of rock masses, and prediction of rock burst proneness and drillability.

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Section: Field Resultsmentioning

confidence: 99%

Section: Field Resultsmentioning

confidence: 99%

Characteristic Impedance and Its Applications to Rock and Mining Engineering

et al. 2023

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Underground Rock Mass Behavior Prior to the Occurrence of Mining Induced Seismic Events

Afrouz

Westman

Dehn³

et al. 2022

Geotechnics

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The variations of seismic velocity prior to the occurrence of major seismic events are an indicator of the rock mass performance subjected to mining-induced stress. There have been no prior field-scale studies to examine stress change within the rockmass volume immediately prior to potentially damaging mining-induced seismicity. Monitoring stress change is critical for mine stability and operation safety and eventually improves production by optimizing mine designs and mining practices. In this study, five major seismic events that occurred in a narrow-vein mine were used as case studies in order to investigate any significant changes in P-wave velocity distribution, on a daily basis, within a week of seismic events with Mw > 1; if observed, such changes could provide a warning to mine engineers and workers. It was observed there was no consistent significant velocity change of more than 1% within 200 m of the hypocenters within 6 days prior to the events. Additionally, the influence of blasting in the week of the occurrence of events was investigated however no recognizable trend was observed between blasting and changes in the seismic velocity distribution within the rock mass on the day of a blast or the following day.

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Time-Dependent Monitoring of Seismic Wave Velocity Variation Associated with Three Major Seismic Events at a Deep, Narrow-Vein Mine

Cited by 2 publications

References 30 publications

Characteristic Impedance and Its Applications to Rock and Mining Engineering

Characteristic Impedance and Its Applications to Rock and Mining Engineering

Underground Rock Mass Behavior Prior to the Occurrence of Mining Induced Seismic Events

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