Through to acoustic emission technology understanding, in the light of the mining engineering key stratum theory, applies it in overheadmining.
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 overheadmining.
Visual pollution, which can refer to the presence of overhead power lines, motorway billboards, scarred landforms (as from strip mining), open storage of trash or municipal solid waste.