Abstract: In order to study the dynamic disaster caused by the rock burst to the deep tunnel, the constitutive model and the influencing factors of the plastic region of the rock burst were analyzed based on case study of Fuxin Evergrande Coal Mine. Considering the critical impact stress and the critical impact radius of the damage, the plastic region constitutive model of the rock burst roadway was established based on the elastic-plastic theory, and the model parameters were obtained through the three-axis test. The model was verified by field measured data. The influence of five factors on the critical impact stress and radius was analyzed, including elastic modulus, post-peak drop modulus, cohesion, internal friction angle and support stress. The results show that the critical impact stress is less than the self weight of the rock in the upper part of the tunnel, and the rock burst is easy to occur, which is in line with the actual situation, that the critical impact stress has a minimum value point with the increase of cohesion and internal friction angle, that the critical impact stress is gradually reduced with the increase of the cohesion, but increases with the increase of internal friction angle, that the greater the cohesion is, the greater the probability of rock burst will be, and that there is a monotonic relation between the elastic modulus, the peak-to-drop modulus and the supporting stress with the critical impact stress and the radius.

Key words: rock burst, circular roadway, constitutive model, critical impact radius, critical impact stress