| It is great significance to investigate mining close coal seam in deep mining engineering of coal resources. The current emphasis of most relationship research on close coal seam is on the failure of single rock or coal. The dissertation focuses on the whole failure of the combination coal-rock sample. MTS experimental system has been employed to investigate the deformation and failure of close coal seam coal-rock samples under different confining pressures. And the relationship between critical condition of peak strength, Poisson's ratio, and elastic modulus with confining pressure parameters has been obtained. The failure of coal-rock sample in coal mine is the coupled effects of energy release and energy dissipation. Therefore, a whole coal-rock failure criterion based on energy release theory under different confining pressures has been correspondingly obtained. And the physical mechanical mechanisms of the whole failure of coal-rock sample have been revealed. On this basis, based on Discontinuous Deformation Analysis, the effects of several dynamic pressures on the adjacent layer of coal mining and coal pillar have been simulated, and an optical supporting idea for tunnels in close coal seams has been presented. The simulation results based on Discontinuous Deformation Analysis (DDA) is more consistent with on-site monitoring data. This analysis confirmed that the DDA method can be used to optimize of bolting support design.
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