Abstract: Taking left coal pillar with the width of 40 m in 5301 working face of a mine as the research background, the distribution characteristics of vertical stress has been obtained by means of theoretical calculation and numerical simulation. Based on this, the rock burst mechanisms are studied and the results are as follows: The impedance force of coal pillar is higher than impact force before disturbed by mining, so rock burst is less likely to occur. But in the stage of mining, the advance abutment pressure of working face is superposed by the original stress, consequently impact force is greater than resistance force and the risk of rock burst may increase greatly. According to this, the partition of dangerous areas and dangerous levels is obtained. The working face can pass by left coal pillar zones safely through implementing pressure relief and relief measures. The accuracy of the analysis result was proved by monitoring dynamic stress.

Key words: left coal pillars, rock burst, inducing mechanism, prevention technology