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In order to solve the difficult problems on coal mine floor water inrush evaluation, on the basis of the servo-controlled permeability test of rock in the complete stress-strain process, the concept of expansive limits anti-permeability strength was presented. Then established coal floor water inrush model, the model includes the floor aquifuge effective thickness, lithology, rock mass integrity and expansive limits anti-permeability strength and detailed describes how to get valus the factors. Finally, took No. 17 coal seam of Yangcun coal mine in Yanzhou as an applicational example, it proves that the expansive limits anti-permeability strength method is feasible on the floor water inrush evalution

A Expansive Limits Anti-Permeability Strength Methodology of the Coal Mine Floor Water Inrush Evaluating