Dynamic analysis of fault slips and their influence on coal mine rib stability

0532514 - ÚGN 2021 RIV AU eng C - Konferenční příspěvek (zahraniční konf.)
Němčík, J. - Venticinque, G. - Gong, Libin
Dynamic analysis of fault slips and their influence on coal mine rib stability.
Proceedings of the 2020 Coal Operators Conference. Wollongong: University of Wollongong - Mining Engineering, 2020 - (Aziz, N.; Kininmonth, B.), s. 264-274. ISBN 978-1-74128-320-4.
[Coal Operators Conference 2020. University of Wollongong (AU), 12.02.2020-14.02.2020]
Institucionální podpora: RVO:68145535
Klíčová slova: dynamic analysis * coal bursts * fault slip
Obor OECD: Mining and mineral processing
https://ro.uow.edu.au/coal/

Historical data indicate that in deep coal mines the presence of faults in close proximity to excavations affect the frequency of coal bursts. A number of researchers have
attempted to correlate the fault geometries to the frequency and severity of coal bursts but dynamic numerical modelling has not been used to show how faults can affect coal ejection
from the rib side. The dynamic numerical analysis presented here show how different orientations of fault slips may affect coal bursts. To prove the concept, 89 cases of slipping fault
geometries were modelled using the FLAC3D software and their effect on rib stability investigated. The results indicate that there is a simple and logical correlation between the fault
location, its slip velocity and the ejection of the yielded coal rib side. The seismic compressive wave generates rock/coal mass velocities that directly impact the rib side. If the coal rib is
relatively disturbed and loose, these velocities can cause its ejection into the excavation. The slip direction typically impacts one side of the mine roadway only. A 1 m thick loose coal block
attached to the 3 m high rib side in mine roadway was ejected at speeds ranging from 2.5 to 5 m/s depending on the fault location, its orientation and the maximum fault slip velocity modelled at 4 m/s.

Trvalý link: http://hdl.handle.net/11104/0310988