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实验研究了放顶煤开采顶煤破碎块度与支承压力（采深）、煤体强度和裂隙发育程度的相互关系，根据放煤率要求和可放出块度原则获得能预测临界开采深度的关系式，用加权平均块度指标评价支承压力、煤体强度和裂隙发育程度对顶煤冒放性分类的影响，提出顶煤冒放性的三因素评价准则．
The relationship between the crushing degree and supporting pressure (mining depth) of top coal caving in caving coal mining was experimentally studied, and the relationship between the strength of coal and the development of fractures was studied. The relationship between the critical mining depth and the coal release rate The weighted average block index is used to evaluate the influence of support pressure, coal mass strength and fissure development on the classification of top coal, and the three-factor evaluation criterion of the top coal release is proposed.