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Abstract Based on the mining with pillar supporting in the mined-out area，a rheological mechanical model of pillars and roof plate system for mined-out area is established，which brings out the displacement control function of the roof stratum supported by pillars under rheological effect；and the fracture stages in roof stratum are analyzed regarding to the time-dependent behavior. The result indicates that the roof stratum supported by pillars in the mined-out area will gradually fail and till collapse by taking into account of the rheological feature of pillars. Based on a case study，the proposed mechanical model could be used to estimate the stable time of the roof stratum in pillar-roof system of mined-out area by considering the rheological behavior of pillars.
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Received: 08 June 2009
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