In recent years, the problem of the effects of ground vibration generated by blasting on nearby structures has received a lot of attention. To minimize or eliminate damages, we need a reliable basis on which to plan and conduct blasting operations. For this reason, we performed seven experiments in the Peikang area. The observed peak ground motion values for different weights of explosive and source-receiver distances were used to obtain the following attenuation equations:
Acceleration (cm sec-2): A = 6.1476R-1.6263W1.0375,
Velocity (mm sec-1): V = 3.5315R-1.2664W0.7836,
where W represents the weight of explosive in gm, and R is the source-receiver distance in meters.
Additionally, the ground acceleration time histories of the test were transferred to a frequency domain to study their contents. From the spectra, we realize that the dominant frequency band of the Peikang area is lower than 10 Hz. There is also a second energy concentration in the 15-30 Hz band. The particle motions indicated that the high frequency vibration (larger than 15 Hz) is a body wave which came from the blast· source and the low frequency vibration (lower than 10 Hz) is mainly a surface wave contribution which was generated by the local geological structure.