COAL AND ROCK MASSIF BEDDING THE SEAM OPENING AND TECTONIC DEFORMATION GEOMECHANICAL STATE MODEL DEVELOPMENT AND ITS APPLICATION AT MEDIUM STRESSED STATE COLCULATION
The model of geomechanical state of the coal and rock massif containing mine workings done near the geological fault is presented in the article. The fault has the form of the narrow slit filled with an elastic material with the specified stiffness characteristics for compression and displacement. The model is built on the basis of the main positions of the mechanics of the deformable solid and implemented with the use of the boundary element method. During formulation of boundary condition on the contour of the mine opening a modification of the method of boundary elements in the form of dummy loads is used and boundary conditions on the contour disorders presented in the form of discontinuous displacement method. The conditions for the inelastic deformation occurrence are the strength criterion of Coulomb – Mohr and Mohr - Kuznetsov. The diagram of the seam condition stresses is given as the Prandtl diagram in which the material’s ultimate deformation section is horizontal. The epures of the bearing pressure were built in the marginal part of the seam with/without due consideration of the geological fault presented in the form of tectonic deformation. It is shown that when the deformation located horizontally above the working the characteristics of the bearing pressure are higher when it is absent. The presence in the roof a tectonic deformation.is the reason for the appearance of horizontal tensile stresses in its rocks, which can reach significant values.
Keywords: ROCK MASSIF, COAL SEAM, SEAM ultimate stress, friction coefficient, internal friction angle, maximum stressed zones, rock strength theory, mine opening, tectonic deformation.
Авторы: N.V. Cherdantsev, S.V. Cherdantsev
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