The paper analyzes the occurring mechanism of tension rock burst of hard roof and points out that a large area of goaf is formed and a large tensile stress region after a large area of thick hard roof is mined. When the micro-cracks of the internal rock accumulate to a certain extent, it may cause the avalanche type of chain reaction, under the micro-disturbance. The roof rock cracking and formation of the process of separation layer are simulated with finite element software. The result shows that the stress is released and redistributed and a new stress concentration is formed after the roof cracking. Occurring mechanism and numerical simulation of tension rock burst of hard roof can provide theoretical basis for predicting the rock burst of roof bearing tension type.
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