Stope Span Determination and Isolated Pillar Mining of Caving Method to Filling Method in a Mine
A mine plans to change the original caving mining method into filling mining method.In or-der to avoid the mutual influence of the two mining methods on the mining area,a certain thickness pillar is set between the two mining methods as an isolated pillar.Because the relevant engineering mine has been ar-ranged and constructed in the early stage,the isolated pillar with a thickness of 11.25m is now set up.In or-der to make the best use of the existing conditions,a three-dimensional model of isolated pillar and stope with spans of 12,13,14,15 m is established to analyze and study the stability of stope roof with different spans under isolated pillar.The research results show that the reasonable span of stope under isolated pillar of this thickness should not exceed 13 m.Based on the mining technical conditions of isolated pillar,the stoping scheme is proposed to choose upward horizontal slicing method when the ore price is high and sub-level caving method without bottom pillar when the ore price is low.
cavingmining methodfilling methodstope spanthe thickness of the isolated pillarstope stability
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