Integrated Evaluation of the Worked-Out Area Partial Backfill Effect of Stress-Strain State of Coal-Bearing Rock Mass

Abstract

The paper gives information on the engineering solution concerning the extraction of thin coal seams with partial backfill of the worked-out area. Geomechanical model of coal-bearing rock mass has been substantiated. A technique to carry out computational experiment aimed at the processes of coal-bearing rock mass displacement within a zone of extraction influence has been represented. Curves of rock pressure stress components distribution (i.e. horizontal stresses, vertical stresses, and stress intensity) within the front bearing pressure and worked-out area for traditional methods (if roof is controlled by means of complete rockfall) and for selective mining with partial backfill have been plotted. Relying upon the carried out studies of stress-strain state of coal-bearing rock mass, overall conclusion has been made on the advantage of selective mining with partial backfill from the viewpoint of geomechanics of the rock mass behaviour.

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