The peak vibration velocities and distributions of main frequencies induced by the tunnel blasting operations of Wuhan Metro Line 5 when it was passing through the air defense chamber, Beijing-Guangzhou railway, Yellow Crane Tower and Sacred Stupa were analyzed based on the field monitoring data. Furthermore, FLAC3D software was used to analyze the vibration velocity attenuation law, displacement, and stress response law of the air defense chamber structure under the influence of upper bench blasting. The field monitoring results were in good agreement with the numerical simulation results. The results showed that the air defense chamber and Sacred Stupa were affected the most by blasting with the vibration velocity close to the limit value. While the impact of blasting on the reinforced concrete structure of Yellow Crane Tower was small. The blasting vibration of the existing railway was less than 0.9 cm/s, lower than the control value of 2 cm/s. With the advance of tunnel working face, the impact of blasting vibration on the railway will get smaller. The maximum peak vibration velocity of each measuring point appears in the vertical direction, and the corresponding main frequency is mainly located in the low and medium frequency region. In addition, the vibration energy mainly concentrated in the frequency range of 20~65 Hz. The attenuation of peak vibration velocity (PPV) at each part of the civil air defense chamber is different with the maximum value appears near y=4 m, and the PPV attenuates faster in the excavated area. The displacement of the air defense structure is within the control range, and the maximum displacement and principal stress are concentrated at the arch foot B which is closer to the blasting source. Finally, the safety control value of the peak vibration velocity of the civil air defense structure is obtained by regression of peak vibration velocity and maximum principal stress.

numerical simulation  /  blasting vibration  /  metro tunnel  /  peak vibration velocity