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.
关键词
隔离矿柱/安全系数/单元安全度/沉降位移/厚度优化
Key words
barrier pillar/factor of safety/zone safety/settlement deformation/thickness optimization
维普
万方数据