Abstract:

Based on the limit equilibrium theory of rock mass, the mechanical mechanism of water-inrush of seam floor was analyzed. The theoretical formulae of the limit hydraulic pressure of seam floor were deduced through taking the facing length,the thickness and the lithological association of floor rockmass into consideration. The water-inrush risk was predicted according to the geology condition in Baode coal mine. By contrasting and analyzing, the method of limit hydraulic pressure of seam floor could improve the water inrush coefficient method, and could be more effective in predicting the water inrush danger with bigger facing length.

Key words: the limit equilibrium theory of rock mass, the mechanical mechanism of water-inrush of seam floor, the limit hydraulic water-inrush pressure, prediction of water-inrush