Optimization of Sequence of Drift Stoping by Cemented Backfilling Under Complex Stress Conditions
For discussing rational sequence of drift stoping by cemented backfilling under complex stress conditions,with No.2 mine of Jinchuan Group as an example,a three-dimensional numerical model was constructed with a numerical simulation software,and was then used to analyze the stress field,displacement field and plastic failure zone in drift stoping with different sequences.On this basis,the drift stoping sequence,after optimization by adopting a combined weighting and fuzzy comprehensive evaluation,was then adopted in an on-site industrial experiment.The results show that both mining sequence by overhand or underhand stoping and drift stoping with different spatial sequence can bring a certain influence to the maximum principal stress,maximum tensile stress,vertical displacement,plastic failure zone,as well as the maximum principal stress and vertical displacement in the next stope nearby;mining sequence of underhand stoping followed by overhand stoping,or firstly drift stoping of vertical ore mass,can make the overall mining with higher safety.The on-site experiment with such mining sequence presents better effect.It is concluded that this research can provide some reference in the design and optimization of mining sequence for drift stoping by cemented backfilling under complex stress conditions.
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