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关键部位二次组合支护是软岩巷道支护新技术。介绍了关键部位二次组合支护原理、最佳二次组合支护时段的确定、组合支护设计要点及工程应用
The secondary part support of key parts is a new technology of soft rock roadway support. The principle of secondary combination and support of key parts, the determination of the optimal secondary combination support period, the design support points of composite support and its application