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为了查明煤和瓦斯突出的原因,人们已经多次使用了煤岩学方法。B.阿尔伯恩和R.万德罗伊斯,在显微镜下测定了煤的裂隙率,以大块磨片为单位测定单位面积煤的间小的裂缝数目。由于这种方法需要许多时间,B.阿尔珀恩研究了一种快速方法,该方法是以有细小裂缝的煤易于机械破碎为基础的。在一个滚筒中施加机械压力后,有裂缝的煤较之完整的煤能产生较多的细粒。H.尤恩德根、M.泰赫米勒和D.聚恩多尔特,P.格吕纳克拉、H.尤恩德根和M.
Petrology has been used many times to find out why coal and gas are prominent. B. Arborn and R. Vandroyus, measured the fracture rate of coal under a microscope and determined the number of small cracks per unit area of coal in terms of chunk pieces. Because of the time required for this method, B. Alpern studied a rapid method based on the mechanical breakdown of coal with small cracks. After mechanical pressure is applied to a drum, cracked coal produces more fines than complete coal. H. Yundgen, M. Tehmeiller and D. Polynold, P. Grunerkra, H. Youndgen and M.