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临界不耦合系数炮孔直径和药卷直径之比叫做不耦合系数，以 Rd 表示。假定该药包爆炸时在炮孔壁面上产生的切向应力等于岩石的抗拉强度 σₜ，则此时的系数叫做临界不耦合系数 Rdc
expl. critical decoupling index

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