Research overview on dynamic response and damage of existing structure under tunnel blasting vibration

The local members of buildings are primarily prone to suffering damage subjected to tunnel blasting vibration. Firstly, the attenuation law of peak vibration velocity and frequency of blasting vibration wave in tunnel are described. Dynamic response characteristics of structure under tunnel blasting vibration are summarized by response spectrum method, time history analysis method, damage and fracture indicator method and field test. The damage mechanism and delicate members of structure are interpreted under tunnel blasting. According to high-order local modal analysis, damage assessment and dynamic response of structure under tunnel blasting vibration are introduced. The current safety standards of vibration velocity frequency are summarized. In addition, the improvement methods of safety standard are expounded. Finally, this study shows the future research as following: (1) 3D full structural model is established in consideration of bearing and non-load-bearing members in order to explore the damage and dynamic response of non-load-bearing members. (2) Based on the structural dynamics and high order modes theory, by analyzing the relationships between dominant frequencies of the blasting vibration and natural frequencies of high order modes of buildings, the vibration effect under high frequency tunnel blasting are explored. (3) Considering the peak particle velocity and stress of local members coupling under tunnel blasting, the dynamic damage mechanism and delicate members of structure are investigated in order to improve and perfect the safety standard of blasting vibration. (4) Integrating big data and informatization with structural health monitoring technologies, it is to achieve dynamic, quantitative and accurate evaluation of building safety and structural damage under blasting vibration. © 2019, Editorial Office of China Civil Engineering Journal. All right reserved.