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随着矿井开采深度的不断增加,矿山压力的各种动力显现,其中之一是煤层底板的突然(快速)破坏,使采掘工作更趋于复杂化。
With the increasing mining depth, various forces of mine pressure appear. One of them is the sudden (rapid) destruction of the coal seam floor, which makes the mining work more complicated.