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Based on the limit equilibrium theory of rock mass, we analyzed the mechanism of water-inrush of seam floor and deduced the theoretical formulas of ultimate hydraulic pressure of seam floor through obtaining the facing length, the thickness and lithological association of floor rockmass into consideration. Water-inrush risks were predicted according to the geology condition. Keywords-the limit equilibrium theory of rock mass; the mechanism of water-inrush of seam floor; ultimate water-inrush pressure; prediction of water-inrush

Water-Inrush Prediction of Coalbed Floor Based on the Limit Equilibrium Theory of Rockmass