Analysis of the characteristics of blasting seismic wave induced by explosive blasting with different coupling medium

To clarify the influence of blast-induced seismic wave characteristics due to borehole coupling medium changes is an important guiding significance for blast vibration control. The energy calculation method of blasting seismic wave was derived and the influence of blasting source factors on seismic wave spectral characteristics was investigated. Then, the energy, composition and attenuation difference of seismic wave induced by explosive blasting with different coupling medium were compared and analyzed. Finally, experiments were carried out to verify analysis. The results show that the energy of blasting seismic wave is related to coupling medium, and the energy of water-coupled blasting induced seismic wave is higher than that of air-coupled blasting. The difference of seismic wave energy between water-coupled blasting and air-coupled blasting is not constant and influenced by rock, explosive categories and decoupling charge coefficient. The existence of water makes seismic wave have richer low-frequency components, and the main frequency is also lower than that of air-coupled blasting. In the process of propagation, air-coupled blasting attenuates faster, and the energy difference of seismic wave between water-coupled blasting and air-coupled blasting increases exponentially with propagation distance increase. The research results can provide reference for the safety control of water-rich rock blasting.