Through to acoustic emission technology understanding, in the light of the mining engineering key stratum theory, applies it in overhead mining.

通过对声发射技术的理解，结合采矿工程中关键层理论，将其应用到蹬空开采中。

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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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