... 无支护without timbering；without timber 无支护采矿法open stopes 无支护上向台阶采矿法open overhand stopes ...
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open overhand stopes 无支护上向台阶采矿法
open underhand stopes 无支护下向台阶采矿法
In open stopes the ground above the stope will support its own weight. So the stope is shaped like a series of rooms divided by walls or supported by pillars of ore.
空场回采工作面利用采场上方的岩层支撑自身的重量，所以采场被切割成一系列的由矿壁分隔或用矿柱支撑的峒室。
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