Analysis on Floor Failure under High Water Pressure

摘要

The water inrush disaster in the coal mine occurred frequently with different mechanisms for years. As the mine was reaching into deep, the pressure of confined water became more and more high, which had an increasing effect on floor strata and the intensity and frequency of water inrush accident. From the viewpoint of mechanics, this paper was based on the theory of "Down Three Zone" and key stratum, mechanical model under high water pressure was built. By analyzing these mechanical models, the criterion of failure mechanism of the apron slabs was obtained. Then the stability problem of floor consisted of single lithology and different lithology was studied. At the same time, the first upper and lower destructive position and confined water were got according to the moment of aquifuge.