Optimization of Barrier Pillar Thickness in Stope Mining Based on Zone Safety
In order to explore influence of the thickness of barrier pillars reserved in stopes on mining operation during the transition from mining with caving to mining with backfilling in a copper-zinc mine in northwest China,six thickness schemes were selected for the barrier pillars in the stope based on the mining status and the engineering geological conditions.Then,a three-dimensional numerical model was constructed with 3Dmine-Rhinoceros,and factor of safety and zone safety were adopted in the analysis.As for the mind-out area without backfilling in the middle section of upper part,three continuous stope interval mining on the level of 210 m was calculated based on simulation with FLAC3D,and the changes in roof settlement deformation,factor of safety and zone safety were also analyzed for the barrier pillars left with different thickness after mining.It is found that with the barrier pillars of 12 m in thickness,the stability of stope can be ensured during transition of mining.Thus,it is recommended that the thickness of reserved barrier pillars be no less than 12 m.
barrier pillarfactor of safetyzone safetysettlement deformationthickness optimization
万方数据
维普
