... overhead drilling 上向钻眼 overhead mining 上向梯段回采 overhead rope 上拉式极绳 ...
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roadway affected by overhead mining 跨采巷道
Overhead monorail installations for mining 采矿用单轨架空设备
overhead mining
开销矿业
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The floor roadway should be located out of the abutment stress zone when protection coal pillar is retained, or the working face should be pushed away for enough distance under overhead mining.
留设保护煤柱时，底板岩巷应位于集中应力区的外侧或跨采时工作面应推过足够距离，使巷道靠近采空区应力恢复区的下方。
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