The stability of the ore pillar and the roof is a key issue in the pillar recovery in unfilled mined-out area.
在空区未充填的情况下回采矿柱，矿柱与采空区顶板的稳定性是一个关键问题。
The stability of the ore pillar and the roof is a key issue in the pillar recovery in unfilled mined - out area.
在空区末充填的情况下回采矿柱，矿柱与采空区顶板的稳定性是一个关键问题。
In this thesis, according to the condition of Mujia Hill, the method of roof cutting and ore pillar dilapidation is proposed.
提出用切顶与矿柱崩落法处理木架山采空区。
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