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1 Journal of Sustainable Mining

1 2020

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Optimum location of last-mined stope with the influence of backfilling

Xu Huawei, Apel Derek B.

Journal of Sustainable Mining

2020

Vol. 19, iss. 4

212--220

Many mines in Canada have adopted sublevel stoping method or one of its variations, such as blasthole stoping (BHS) and sublevel longhole retreat (SLR), for the extraction of steeply dipping orebodies. Stope, as the basic excavated element, plays a significant role in the whole process of mining activity. In the mining method of BHS, crossing cuts are excavated at tops and bottoms in each stope for drilling blast holes and transportation of mined out orebodies. Crossing cuts failure may result in prolonged production interruption, fatality, and equipment loss. After the completion of orebodies excavation from the sublevel open stope, the void stopes will be backfilled with cemented rockfill (CRF) for secondary stopes. The strength of the CRF affects the stability of the adjacent crossing cuts for the next excavation scheme. Rational location of the last mined stope can effectively eliminate the instability of crossing cuts. By using the Finite Element Method (FEM) such as Abaqus codes in this study, this paper presents the comparison of floor heaves, roof displacements, and sidewall swellings of the crossing cuts in each stopes of different location scenarios. The numerical simulation shows that the central stope location of the level is the optimum one for the last mined stope.