Theory of key stratum in ground control.
岩层控制的关键层理论。
The idea of key stratum pressure is put forward, and the ground pressure is mainly influenced by the breakage of key.
提出主关键层来压的新概念，指出回采工作面矿压显现程度主要受主关键层破断的影响。
The idea of key stratum pressure is put forward, and the ground pressure is mainly influenced by the breakage of key stratum.
提出主关键层来压的新概念，指出回采工作面矿压显现程度主要受主关键层破断的影响。
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