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基于采动覆岩中的关键层理论,深入分析了相邻坚硬岩层所产生的复合效应,并用有限单元法计算了复合关键层的断裂跨度
Based on the key strata theory in overburden strata, the compound effect produced by the adjacent hard rock strata is deeply analyzed and the fracture span of the composite key strata is calculated by the finite element method