水岩作用下底板导高带的导升机制

Guide Rising Mechanism of Height of Water Flowing Fractrured Zone Under Water Action

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。

The height of water flowing fractured zone is hard to deternfine. In order to have a more in - depth understanding on its guide rising mechanism, rock fracture formation and expansion will be studied. The result shows that the depth of original fissure is limited, which is mainly related to the pressure of the confined water. Crack propagation is very complex, but it mainly caused by ground stress, confined water pressure, the crack angle. The greater of the water pressure and the inclination of crack angle, the easier upward devel- opment of the crack. The water flowing fractured zone is more easily run through the floor failure zone with the increased probability of sudden water inrush.