Comprehensive analysis of failure modes in sublevel backfill stopes under mining disturbance
To clarify the cause of damage accidents in the sublevel backfill stopes of a mine,numerical simulation analysis combined with on-site monitoring was employed to investigate the stress state,displacement deformation,and plastic zone variation characteristics of the rock mass in the backfill stope under SBF mode during different segmented excavation disturbance processes.The results indicate that the impact of mining disturbance on the surrounding rock and surrounding tunnels of the SBF mining area has obvious regional characteristics,and the maximum excavation effect zone occurs around the surrounding rock and panel pillars.The impact of mining activities in different segments on the displacement of the roof of the mining area varies.During the excavation process in the second segment,the vertical displacement increment of the roof of the mining room is the highest,while during the excavation of the third segment,it is easy to form stress concentration and shear sliding failure of the pillars.At the same time,it also causes the collapse of the side walls of the tunnels located in the adjacent goaf inside the pillar.The surrounding rock of the roof of the SBF mining area is mainly in a tension shear zone,and the failure mode of the pillars is significantly affected by shear.The on-site monitoring results are consistent with the conclusions of the numerical simulation.The results can provide a comprehensive understanding of the laws and mechanisms of SBF mining site damage accidents in the mine,clarify the potential hazards associated with SBF mining method for mine site safety,and provide safety references for similar mines.
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