Signal Characteristics and Energy Transmittance During Detonation Tube Excitation in a Gas–Water–Soil Environment

To examine the characteristics of signals and the transmission of energy during the excitation process of detonation tubes within a gas-water-soil environment, an experimental system that utilizes shock waves and gases generated by detonation tubes to induce vibration waves in soil through coupling with a small pond is developed. The transmission of pressure signals in multiphase flow fields is investigated through experimental means. The characteristics of signals in water and soil, along with the energy transmittance during the process are analyzed using the fast Fourier transform and wavelet transform methods. The results indicate that the signal in water is composed of low-frequency signals, which are generated by bubble expansion and rupture, as well as highfrequency signals, resulting from shock wave oscillation. The vibration signal in the nearby soil predominantly falls within the frequency range of 10-240 Hz. With the increase in the diameter of the detonation tube, there is a relative decrease in the peak frequency of the signal, and the energy transmittance transitions from being concentrated near the highest frequency position to being uniformly distributed across the entire frequency range. The highest energy transmittance occurs in the frequency range of 60-80 Hz, independent of the diameter of the detonation tube.