结果表明：煤的破碎程度是氧在煤体表面扩散作用的主要度量因子；

The result shows that the coal broken degree is the main token factor for measuring the oxygen free-diffusing characteristics in coal.

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可磨性是煤加工利用过程中的一个重要指标，可磨性指数与煤的破碎机理、煤粒破碎后的粒度分布均有关系。

The grindability of coal is an important parameter in pulverized coal utilization, and the HGI(Hardgrove Grindability Index) is relevant to the coal pulverization and the particle size distribution.

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深入分析了层间顶煤的破碎特点，指出层间顶煤的破碎效果是多因素综合作用的结果，而在不同的开采条件下将具有不同的放顶煤效果。

The stability of main and immediate roof structure and its influence on strata behaviour are analysed. The failure features of roof coal between top and bottom slice are thoroughly studied.

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