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通过用分形理论进一步研究了煤的孔隙结构，通过煤的孔隙结构分形特征把扎隙结构划分为3种孔隙系统，即大孔、中扎和微孔，探讨了分维D2的物理意义及同煤质的关系，初步提出分维D2可以用来作为煤与瓦斯突出的预测指标。
By further studying the pore structure of coal by using the fractal theory, the fractured features of coal are divided into three kinds of pore systems, namely macropores, mesoclays and micropores, and the fractal dimension D2 is discussed. The relationship between coal quality and preliminary proposed fractal dimension D2 can be used as a predictor of coal and gas outburst.