Safety Influence of Percussion Drilling Construction on Existing Railway Bridge Piers

To study the dynamic and static responses of existing railway bridge piers under the influence of percussion drilling, the theoretical analysis, numerical simulation, and field test of the influence of percussion drilling on railway bridge piers were carried out. The theoretical analyses show that the maximum vibration velocity of the railway track under the condition of percussion drilling and the vibration velocity of the existing bridge pier under the coupling of percussion drilling construction and train vibration meet the requirements of the code. The numerical simulation results show that the total displacement, horizontal displacement, and vertical displacement of the existing pier top are all within the scope of the code. Field tests show that the displacement and vibration velocity of the affected piers meet the requirements of the code. However, data comparisons show that the theoretical analysis and numerical simulation do not consider the adverse effects of uneven foundation and construction disturbance, and the calculation results tend to be dangerous.