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COMPARISON OF MINING-INDUCED SEISMICITY WITHIN A FOOTWALL FAULT BETWEEN OVERHAND AND UNDERHAND STOPING METHODS
Session: Rock Mechanics and Engineering Geology II / Mécanique des roches et ingénierie géologique II
Atsushi Sainoki, Mining Engineering, McGill (Canada)
Hani Mitri, Department of Mining and Materials Engineering, McGill (Canada)
The behaviour of faults in underground mines has been attracting much attention from rock mechanics specialists. In this study, a comparison between overhand and underhand sublevel stoping methods is made whilst focusing on the static and dynamic behaviour of a footwall fault intersecting with a steeply dipping orebody. A mine-wide numerical model representing the geological features is constructed. Using the model, static analyses are performed to extract stopes in the orebody. It is found from the result that the stope extraction with the underhand mining method produces more seismically active conditions on the fault, compared to the overhand method. Then, fault-slip is simulated with an instantaneous change of the friction law from static to dynamic. The analysis indicates that there is no significant difference in the intensity of near-field ground motion between fault-slips induced by the stope extraction with the two mining methods.
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