Dynamic model of fault slip and its effect on coal bursts in deep mines

0548176 - ÚGN 2022 RIV AU eng C - Conference Paper (international conference)
Němčík, J. - Venticinque, G. - Shan, Z. - Gong, Libin
Dynamic model of fault slip and its effect on coal bursts in deep mines.
Proceedings of the 2021 Resource Operators Conference. Toowoomba, Queensland: University of Southern Queensland, 2021 - (Aziz, N.; Mirzaghorbanali, A.), s. 186-193. ISBN 978-1-74128-335-8.
[Resource Operators Conference 2021. University of Southern Queensland (AU), 10.02.2021-12.02.2021]
Institutional support: RVO:68145535
Keywords : dynamic model * coal burst * fault slip
OECD category: Mining and mineral processing
https://ro.uow.edu.au/coal/808/

The success of deep mining operations relies upon controlling the fractured ground. It is a documented knowledge that many coal bursts occur when mining close to the existing faults. Gradual stress relief towards excavations and other mechanisms can unload stress normal to the nearby fault plane causing it to slip. The generated seismic waves impact the mine roadway rib sides and can produce a coal burst. As part of the ACARP project, the FLAC3D dynamic numerical model was used to show how a fault slip at various locations and orientations may initiate a coal burst. This study simulates an artificial fault slip with peak velocity reaching 4m/s in 0.013 seconds and displacing 119mm in total. Seismic induced peak particle velocities in rock and its influence on coal rib stability were investigated. 89 numerical models with various fault locations and orientations at 450m depth indicated that a 4 tonne coal block can be ejected from the mine roadway rib side at speeds of up to 5m/s. The important finding is that irrespective of the fault slip magnitude, the fault geometry and the in-situ stresses enable to predict which side of the mine roadway may experience the coal burst. Instructing the mine personnel to use the other side of the roadway may improve their safety. Overall, this research produced preliminary results to prove that this method can be used to flag the coal burst dangers for certain fault locations and orientations in deeper mines irrespective of the fault slip properties that are typically difficult to predict.
Permanent Link: http://hdl.handle.net/11104/0324294