Numerical Simulation of Stress-Strain State of Thick Coal Seam at the End of Long-Pillar Work

Abstract

The article deals with the redistribution of stresses and the formation of fracture regions at the final stage of the excavation post. Considered various options in the formulation of the problem, describe the solution in full and the additional stresses. Presented mechanical model describing the redistribution of the original stresses caused developing mining operations; formation of discharge zones and the additional load near the bottom of the lava and around the DC; areas of possible fall-outs of rocks; displacement of rocks, in particular faith-vertical in roof of recreation center and horizontal to vertical outcrops of in-fighting and dismantling the camera. The deformation model used in solving the problems is built taking into account the possible plastic deformation of both coal and the immediate roof of the formation, which allows taking into account both the fracture of the massif and the nonlinear deformation of the material itself. It is emphasized that the parameters of plasticity can be determined from the solution of the inverse problem using experimental data obtained in situ.