This paper introduces the cleat identification creterion, strict definitions of face cleat and butt cleat and their differences, cleat rank, formation and its control on coalbed permeability.

• 介绍了割理识别准则、面割理和端割理的区分及严格定义、割理级别、割理的研究内容、割理的形成以及割理对煤层渗透性的控制作用。