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NUMERICAL SIMULATION ON THREE DIMENSIONAL
DEFORMATION AND FAILURE OF TOP COAL CAVING
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Abstract Based on the whole sub-level caving process with deformation and failure of coal，the activities of top coal and the roof are analyzed by using FLAC software，and the three dimensional stress，deformation and failure are getten clear. The results show that top coal is difficult to be fragmented under the supporting pressure because of the higher strength of coal，and must be weakened to increase recovery rate. There are zoned characteristics for top coal failure. The top coal begins to move in the site of the peak supporting pressure with 5～7m before coal wall.
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Received: 06 April 2000
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