基于小波包理论研究地下断层对爆破振动传播的影响

为了研究某云南金属地下矿山断层对爆破振动波传播的影响,选用含有断层区域3736北部中段区域、无断层区域3736南部中段区域布置测点。以云南某金属地下矿山真实采集爆破振动数据为研究对象,基于小波包变换、HHT算法、STFT算法开展爆破振动波衰减规律的研究。结果表明：云南某地下金属矿山振动波经过断层前瞬时能量幅值达到10×10_-4^dB,经过断层后瞬时能量幅值达到1.5×10_-4^dB,瞬时能量幅值衰减85%；断层在一定程度上会扰乱振动波能量分布情况,延缓振动能量迅速上升；振动波经过断层后低频能量衰减60%,高频能量衰减71%,总体能量功率衰减77%,无断层区域高频能量衰减18%,低频能量衰减17%,总体能量功率衰减15%；爆破振动波经过断层后,过滤大量高频能量,能量总体分布呈现向低频域方向发展的趋势。

Study on the influence of Underground Fault on blasting Vibration Propagation based on Wavelet packet Theory

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.