Abstract:With the aim of investigating the influence of faulting on blast vibration wave propagation in an underground metal mine in Yunnan, the measuring points are arranged in the north and middle part of 3736 and the south and middle part of 3736, respectively. Using as a research object the actual blast vibration data collected from an underground metal mine in Yunnan, based on the wavelet packet transform, the HHT algorithm, and the STFT algorithm, the attenuation law of the blast vibration wave is investigated. The results show that the instantaneous energy amplitude of the vibration wave of a subsurface metal mine in Yunnan reaches 10 × 10-4dB before the fault and 1.5 × 10-4dB after the fault, and the instantaneous amplitude of the energy attenuates by as much as 85%. This fault will perturb the energy distribution of the vibration wave to some degree and retard the rapid rise of the vibration energy. After the vibration wave passes through the fault, the low frequency energy attenuates by 60%, the high frequency energy by 71%, the total energy power by 77%, the high frequency energy by 18%, the low frequency energy by 17%, and the overall energy power by 15%. Once the blast vibration wave has passed through the defect, a large amount of high-frequency energy is filtered out, and the overall energy distribution exhibits a trend towards the low-frequency domain.