底板巷掩护煤巷最小安全岩柱及两巷平距优化的数值模拟
저판항엄호매항최소안전암주급량항평거우화적수치모의
Numerical Simulation of Minimum Safety Pillar of Bottom Roadway and Shield Coal Roadway and Optimation of Horizontal Distance Between Up and Down Roadways
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