The research of recovery schemes about large-scale difficult mining pillar based on numercial emulator

The paper is based on actual situation of Chengchao iron mine to study the pillar recovery schemes under challenging conditions. According to the three-dimensional ore body and adjacent rock model, rock mechanics test and analyses, a large-scale physical and technical emulation model was built, after checked by the terrene monitoring data, and then it was used to study the different scheme. The surface displacement was disposed by ArcGis software, the result shows: the influence dimension of pillar exploit mainly in the left of the pillar and hanger surface, the filling method is effective to limit the ground deformation and maintained the shaft sites stability. The surface deformation of different mine level is phased grow, the impact of pillar extract to ground was shown after -360m level mine finished, particularly after -465m level exploited. The distortion grade of industry building caused by pillar mined is closely related to the distance to the pillar, the washing plan is the most dangerous. Fill mining method is the appropriate plan for the pillar recovery.