上向分层充填采矿法
Cut-and-fill Mining Method
上向水平分层充填采矿法
upward horizontal slice stoping and filling method
水平分层充填采矿法
horizontal cut and fill mining
下向分层充填采矿法
Underhand cutting and filling method
急倾斜煤层
steep coal seam
thin steeply inclined seam
deeply inclined coal seam
steep lay of coal seam
steeply inclined seam
steep-inclined coal seam
deep inclined seam
steep inclined seam
slant coal seam
steep seam
steeply inclined coal seam
Coal pillar design
steep-inclined coal
sharp dip angle coal layer
steep coal strata
heavy steep and thick seam
房柱式分层充填
layered back-filling method