Stability Analysis of Downward Medium-deepsublevel Open-stoping Method in Baiyinuoer Lead-zinc Mine
Aiming at the safety risks of the downward medium-deep sublevel open-stoping method in Baiyinuoer lead-zinc mine in Inner Mongolia,such as the large exposed area of the roof plate,the high height of the airfield,and the need to work on the upper part of the airfield in the process of mining,we combined the theory of the analysis of the stability of the airfield with numerical simulation and other methods to investigate the safety thickness of the roof plate and the stability of the mine field.The results of the study show that:when the span of the mining field is 5～30 m,the safe thickness of the roof plate in the airspace is 4～15 m;according to the Mathews stability diagram and numerical simulation analysis results,Baiyinuoer Pb-Zn Mine is a relatively stable mining field,and the structural parameters of the mining field with the phase height of 50 m and the sublevel height of 13 m and the sequence of mining back are reasonable.The study can provide certain reference for the safety production of similar mines.
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