顶板周期垮落
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roof periodic caving law 顶板周期垮落规律
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Based on field observations and theoretical analyses, the characteristic of periodic caving of immediate roof and main roof in a room and pillar system was analyzed.
通过理论分析和现场实测，对房柱式采煤的矿压显现规律及其特点进行了探讨。
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