The response of deep rock during excavation is intensive.Based on studying to the dynamic stress field caused by transient unloading of in-situ stress in the process of excavation with drilling and blasting method,the dynamic stress intensity factors of crack in deep surrounding rock under initial stress transient unloading and blasting load are compared,and in meantime the influence of transient unloading to rock burst is discussed in this paper.The result reveals that the disturbance induced by initial st...