Application of the limit equilibrium strength to the seismic assessment of shear related seismicity

Authors: Jarufe Troncoso, J; Potvin, Y; Wesseloo, J

DOI https://doi.org/10.36487/ACG_rep/1201_28_juan

Cite As:
Jarufe Troncoso, J, Potvin, Y & Wesseloo, J 2012, 'Application of the limit equilibrium strength to the seismic assessment of shear related seismicity', in Y Potvin (ed.), Deep Mining 2012: Proceedings of the Sixth International Seminar on Deep and High Stress Mining, Australian Centre for Geomechanics, Perth, pp. 389-400, https://doi.org/10.36487/ACG_rep/1201_28_juan

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Abstract:
Over the last several decades, mine-induced seismicity has created serious safety and production issues for underground mines worldwide. A significant proportion of the large seismic events resulting in rockbursts have been related to a ‘fault slip’ mechanism on shear zones. This source mechanism has been the subject of a number of numerical modelling studies in the past and several techniques have been developed to analyse it, but these methods are highly dependent on the strength properties used to simulate (explicitly or implicitly) the non linear response of the rock mass. A methodology is proposed in this paper to estimate non linear ride without considering explicitly the strength properties of the shear zones, considering the pre-mining Limit Equilibrium Strength (LES). As a result of this methodology, observed seismic trends can be reproduced through numerical modelling and if enough data exists to calibrate the model, accurate magnitudes of seismic moment can be reliably forecasted.

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