One of the approaches to the assessment of the calculation of the destruction of a coal seam edge zone containing a layer, and developed with a breakage heading, has been provided. It is based on the fundamental methods of deformable solid body mechanics and suggests a three-stage solution to the strength assessment problem. First, the method of characteristics is used to solve the problem of building a stress field in the extremely stressed seam area. Then, using the method of boundary integral equations, the parameters of its reference pressure are determined. After that, based on the built stress field and the associated flow law, using the methods of plastic flow theory, a deformation field is built in the edge zone of the seam. The criterion of the destruction of a seam part is the excess of the limiting value by the intensity of deformations, when the destruction of a sample under its uniaxial compression begins.
Based on the studies, dependencies of the distribution of deformation intensities in the seam edge zone for a number of its development depth values have been obtained, and their limiting values have been established, above which the coal seam edge zone of a given span of development begins to collapse. A comparison with the results of similar studies for a homogeneous seam is provided. Apparently, the destruction of a heterogeneous seam precedes the collapse of a homogeneous seam under equal conditions.
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