针对煤层底板中较难确定的导高带,为了对其导升机制有比较深入的认识,研究了导高带中岩体裂隙的形成及扩展。结果表明:原始裂隙的形成的深度非常有限,这主要与承压水的大小有关;裂隙的扩展非常复杂,但主要由地应力,承压水水压,裂纹倾角有关,水压越大,倾角越大,则裂隙越容易向上发展,即底板带水裂隙带越容易贯通底板破坏带,突水发生几率就会加大。 In view of the more difficult to determine the high belt in the coal seam floor, in order to have a deeper understanding of its guide mechanism, the formation and propagation of rock mass fissures in the high belt are studied. The results show that the depth of the formation of the original fracture is very limited, which is mainly related to the size of the confined water. The propagation of the fracture is very complicated, but it is mainly caused by the stress in the ground, the pressure of the confined water and the crack dip. The larger the hydraulic pressure, The larger the fracture, the easier it is for the fractures to develop upward. That is, the more easily the fracture zone with water fissures passes through the floor, the probability of water inrush will increase.