The Bayu tunnel is a controlled project in Nyingchi-Lhasa section of the Sichuan-Tibet railway. Rockbursts happen frequently

and rockburst locations are different in adjacent areas during the construction process. By using the microseismic monitoring system

the evolution laws of rock mass fracture were observed in situ during the process of rockburst location deflection. In addition

the reasons for the deflection of the rockburst locations were discussed. The results showed that the microseismic information was distributed unevenly on both sides of rockburst location deflection. Meanwhile

all the microseismic activities (the number of events

energy and apparent volume) deflected with the deflection of rockburst location

which indicates that they have an obvious spatial correlation. The evolution laws of apparent stress and excavation damaged zones of rock mass in the deflection location reveal that the deflection of rockburst location is related to the change of local stress concentration area

and the rockburst more easily occurs in the area with larger stress concentration. The results provide significant references for the warning and prevention of the deflection of the rockburst locations.