The top-coal caving under the vibration condition is a layer-like uniform caving process rather than a funnel-shaped caving under the gravitation condition.
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释义
研究结果表明,采用振动放顶煤技术,可有效地破坏块裂顶煤在重力放落过程(无振动条件下)中出现的拱式结构;
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