ABSTRACT
The argillites and siltstones are predominantly horizontally layered, a part of which belongs to unstable rocks, reducing sharply the strength characteristics when being moistened and are prone to swelling. The contacts between adjacent lithological varieties are soft and easily lose adhesion when being outcropped or under intense deformations of the massif. According to the mining and geological survey along the length of the panel of the 861 longwall face, in the technical documentation several zones have been distinguished with increased rock pressure, in which the most unfavorable situation in terms of the 861 belt entry stability will obviously develop. The calculation of the stress-strain state has been performed in an elastic-plastic formulation with the representation of the “stress-relative deformation” diagram of each lithological variety and fastening materials by a bilinear function. This allowed, when considering the plastic deformations of the geomechanical system elements, to avoid significant failures in the calculation technology and to increase the reliability of its implementation.
