coal mined out area 煤层采空区
Collapse of mined-out area is an environmental geological hazard of the coal mining area.
采空区塌陷属于煤矿区的环境地质灾害问题。
According to the experiential formula, the caving-in zones and fracturing zones of the coal cave mined out area have been calculated.
根据经验公式，计算了各部位煤洞采空区的冒落带及裂隙带高度。
The possibility is studied for construction of large-seale steel smelting workshop on the surface of mined-out area in Benxi Coal Mine.
本文研究了在本溪彩屯煤矿巳采区地表兴建大型炼钢车间的可行性。
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