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Abstract The occurrences of breakage and water inrush disasters of working face floor under mining above aquifer are increasing with the mining depth in China. Taking the working face floor above deep aquifer in Jiulong Mine as the research object，by means of the core extraction，drill core logging and laboratory testing，the distribution laws of aquifers and mechanical parameters of each rock stratum of the working face floor above aquifer are obtained. Meanwhile，the reliability of parameters are ensured. The similar simulation test for fracture instability characteristics of working face roof and floor during the mining above aquifer are carried out by the self-designed confined water simulation equipment. And the stress variation laws of the roof and floor during working face mining are obtained. Using the noncontact optical measurement technology，the whole field displacement contours are measured. Base on the‘down three zones’theory，the maximum failure depth of working face floor，the raise height of confined water and the thickness of effective confining rock strata in deep region of Jiulong Mine are calculated. The simulation results show that：the‘three zones’appear in deep working face floor above aquifer in Jiulong Mine；and the new confined water simulation equipment can simulate the process of water pressure relief.
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Received: 29 December 2010
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2011, Vol. 30 
