Abstract: According to the typical conditions of special water preserved mining area, the aquiclude stability with two equispaced filling strips has been analyzed through the physical simulation experiment and theoretical analysis. The elastic foundation beam model of aquiclude supported by the strip filling has been set up, and the compression displacement of the filling strip and the deflection formula of the aquiclude beam have also been put forward. Furthermore, the position and depth of the downward crack have been determined. Based on the aquiclude stability criterion, the calculation method of reasonable filling strip width and interval width has been determined. The result has shown that the reasonable strip interval increases with the increase of the mining height, the thickness and strength of the beam. The depth of the downward crack mainly develops with the increase of the strip compression displacement.

Key words: special water preserved mining, strip filling, aquifuge beam, mechanical model