OCCURRING MECHANISM AND NUMERICAL SIMULATION OF TENSION ROCK BURST OF THE ISOLATED COAL PILLAR

In view of the problem that the rock burst of the isolated coal pillar occurs easily and has no practical understanding of the damage theory of the rock burst, the occurring mechanism of tension rock burst of the isolated coal pillar is discussed with finite element software. In which, the fracture and evolution process as a function of the triangle load of the isolated coal pillar is analyzed. The result shows that the coal pillar generates tension fracture on its both sides, the fracture direction is horizontal. After the coal pillar cracks, the stress is released and new stress concentration and the loose region are formed. Tension fracture occurs on both sides of the coal pillar in the horizontal direction. New stress concentration is formed and a loose area is formed after the fracture of the coal pillar on the long-term interaction of roof and floor and geography, the pillar slides in horizontal direction. This can provide the theoretical basis for the prediction and forecast of the rock burst of the isolated coal pillar.