By contrasting with weighting observation data, the conclusion that roof strata have large - small structures is demonstrated.

并通过现场矿压观测资料, 从理论上论证了顶板岩层中存在的结构体实质上包括“大、小结构”两个部分.

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Secondly, discretion formula of roof destruction is obtained by simplifying roof strata to elastic thin board.

其次将分段开采后顶板岩层简化为四边固支的弹性薄板,得出了顶板破断的判别式.

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