Influence of Damping Materials on Blasting Vibration of Cylindrical Pool

In the application research of underwater explosion theory and technology, an explosion tank is a very important basic experimental device. The research on the blasting vibration effect and vibration damping of the explosion tank is of guiding significance for the vibration control and the selection of vibration damping materials during the blasting of the cylindrical water tank. In order to explore the impact of explosive vibration caused by the internal charge explosion on the surrounding ground of the cylindrical pool, and to seek effective vibration reduction methods, two kinds of vibration reduction materials, construction gravel and SD-type rubber vibration reduction pad, were selected, and explosion tests were carried out in a small explosive pool under three modes, single charge without vibration reduction, with SD-type rubber vibration reduction pad and with gravel vibration reduction. The collected blasting vibration signals were analyzed by peak particle velocity, EEMD-HHT (ensemble empirical mode decomposition-Hilbert-Huang transform) processing and wavelet packet analysis. The results showed that the vibration signals include the blasting vibration caused by the explosion shock wave and the ground vibration caused by the pool jumping, and the the ground vibration caused by the pool jumping can be effectively identified by Hilbert instantaneous energy analysis. Compared to the single charge without vibration reduction, the vibration velocity and vibration energy under the gravel layer modes are reduced by 53.0% and 43.1%, the vibration velocity and vibration energy for SD-type rubber cushion modes are reduced by 64.9% and 57.4%. The frequency of blasting vibration signal for the three vibration reduction modes is mainly distributed in the range of 10–80 Hz. The energy proportions for the frequency range of 10–40 Hz under the three operating modes are 79%, 69% and 66%, respectively, and the energy proportions for the frequency range of 40–80 Hz are 11%, 29% and 31%, respectively. The gravel and SD-type rubber have the effect of absorbing energy and reducing low-frequency components, and increasing high-frequency components, which can effectively reduce the peak vibration velocity of nearby measurement points. Compared to the effect of the two kinds of vibration absorbing materials, the construction gravel results more uniform energy distribution of the vibration signal frequency band than that of the SD-type rubber.