Mechanism of mining-associated seismic events recorded at Driefontein - Sibanye gold mine in South Africa

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F17%3A00488267" target="_blank" >RIV/67985530:_____/17:00488267 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Mechanism of mining-associated seismic events recorded at Driefontein - Sibanye gold mine in South Africa

Popis výsledku v původním jazyce

Mode of fracturing of the rock mass is the key point in rock mechanicsnapplied both to natural earthquakes foci and to sources of induced or triggerednseismic events. The parameter providing the answer is the source mechanism. Thenmoment tensor, currently used as a universal tool for descriptions of the mechanism,ninvolves general balanced dipole sources. However, in case of small-scale seismicnevents, the moment tensor need not be always reliably determined. In an effort to fitnthe data, there may be notable non-shear components caused by the low quality ofninput data. It means that while the orientation of the fracture is usually estimatednwell, the mode of fracturing itself may be dubious. Constraining the source model tondirectly determine a simpler one is convenient for describing the physical phenomenanexpected for a particular focus. An opening of new fractures can be described, to anfirst approximation, by a tensile crack, optionally combined with a shear slip. Such annalternativemodel is called a shear-tensile crack (STC) sourcemodel. The combinationnis practical, and can be used to both identify events that reflect purely mode-I (tensile)nfailure and to determine the dilation angle of the fracture undergoing shear. Thenadvantage of the STC is even enhanced in application to mining tremor foci, asnimplosion (i.e., tensile process with a negative sign) can be reasonably expectednthere as the consequence of collapsing mined-out cavities. From the technical pointnof view, the STC inversion is more robust than theMT one thanks to smaller numbernof the model parameters (5 vs. 6), which is crucial in cases of a poor monitoringnconfiguration.

Název v anglickém jazyce

Mechanism of mining-associated seismic events recorded at Driefontein - Sibanye gold mine in South Africa

Popis výsledku anglicky

Mode of fracturing of the rock mass is the key point in rock mechanicsnapplied both to natural earthquakes foci and to sources of induced or triggerednseismic events. The parameter providing the answer is the source mechanism. Thenmoment tensor, currently used as a universal tool for descriptions of the mechanism,ninvolves general balanced dipole sources. However, in case of small-scale seismicnevents, the moment tensor need not be always reliably determined. In an effort to fitnthe data, there may be notable non-shear components caused by the low quality ofninput data. It means that while the orientation of the fracture is usually estimatednwell, the mode of fracturing itself may be dubious. Constraining the source model tondirectly determine a simpler one is convenient for describing the physical phenomenanexpected for a particular focus. An opening of new fractures can be described, to anfirst approximation, by a tensile crack, optionally combined with a shear slip. Such annalternativemodel is called a shear-tensile crack (STC) sourcemodel. The combinationnis practical, and can be used to both identify events that reflect purely mode-I (tensile)nfailure and to determine the dilation angle of the fracture undergoing shear. Thenadvantage of the STC is even enhanced in application to mining tremor foci, asnimplosion (i.e., tensile process with a negative sign) can be reasonably expectednthere as the consequence of collapsing mined-out cavities. From the technical pointnof view, the STC inversion is more robust than theMT one thanks to smaller numbernof the model parameters (5 vs. 6), which is crucial in cases of a poor monitoringnconfiguration.

Druh

C - Kapitola v odborné knize

CEP obor

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OECD FORD obor

10507 - Volcanology

Projekt

<a href="/cs/project/GAP210%2F12%2F2235" target="_blank" >GAP210/12/2235: Modely seismického zdroje: mezi dvojitým dipólem a momentovým tenzorem</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název knihy nebo sborníku

Rock mechanics and engineering. Vol. 5. Surface and ungerground projects

ISBN

978-1-138-02763-3

Počet stran výsledku

28

Strana od-do

349-376

Počet stran knihy

748

Název nakladatele

CRC Press

Místo vydání

Boca Raton

Kód UT WoS kapitoly

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