The study presents some results of the solution of an elastoplastic problem obtained within the flow theory for the state of an anisotropic coal seam, based on its strength, adjacent to a well located in a non-homogeneous stress field generated by a cleared face. A criterion of the destruction of a part of the seam located in the plastic area is adopted as a deformation criterion.
The problem of the geomechanical state of a stratified coal seam containing a degassing well is solved through an elastoplastic statement. The well is located within the area impacted by the cleared face, and the coal seam adjacent to it lies within the non-heterogeneous stress field induced by the clearing operations. Components of the field are determined based on the earlier solved problem of the stress state of the rock massif containing the coal seam and the cleared face. The length of increased rock pressure propagating into the seam following its fully stressed area is significant and can extend hundreds of meters from the mine face, often reaching untouched rock massif.
Therefore, the problem of the stress state of the coal massif and conditions of its destruction is formulated as a classic statement, according to which, in its location, the well is within the field of horizontal and vertical stresses active around the cleared face. Stresses in the plastic area adjacent to the well are determined using the characteristic method, and the area dimensions are obtained from the solution of a boundary-value problem of the elasticity theory. The destruction occurs in accordance with the deformation criterion, in which the deformation field in the plastic area is determined by the associative law of plastic flow.
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