Numerical simulation of rock moving process of combined open-pit and underground mining based on microseismic monitoring and rock mass damage model
In order to study the temporal and spatial variations in surrounding rock displacement during the process of combined open-pit and underground mining,this study focuses on the Dahongshan iron mine combinded open-pit and underground mining project.Specifically,the microseismic events occurring between exploration lines A34 and A37 were examined to discern the patterns of their distribution.Moreover,a novel rock damage model,incorporating microseismic events,was developed and integrated into numerical simulations to analyze the progressive rock damage and displacement within the combined mining zone of exploration lines A34-A37.It is worth noting that the preliminary findings indicate that the inhibitory effect of the F2 fault on rock mass movement resulting from underground mining has become largely ineffective,except for a localized inhibitory effect near the 775 m elevation.Consequently,the estimated collapse angle of the surrounding rock is determined to be 79.3°,while the displacement angle amounts to 74°.To ascertain the reliability of the numerical simulations based on the microseismic monitoring-derived rock damage model,stochastic medium ore drawing theory,along with field measurements of surface subsidence,was employed to validate the simulated conclusions concerning rock displacement.Encouragingly,the outcomes of the validation process confirm the credibility and robustness of the simulation results.Overall,this research makes significant contributions to the analysis of rock mass displacement in the context of combined open-pit and underground mining,thereby providing invaluable insights and serving as a fundamental reference for future investigations in this domain.
rock mechanicscombined open-pit and underground miningmicroseismic monitoringrock mass damagenumerical simulationrock mass movement
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