Characterizing Rockbursts and Analysis on Hilbert-Huang Transform Spectrum of Microseismic Events, Shuangjiangkou Hydropower Station, Based on Microseismic Monitoring

The Shuangjiangkou hydropower station in China has complex geological conditions with high situ stress. During the tunnel excavation, rockbursts occurred frequently, which seriously affected construction progress. Microseismic (MS) monitoring technology was used to explore rock MS activities predict rockbursts. system can capture a large number of signals. Based on Hilbert–Huang transform (HHT) instantaneous frequency analysis technology, using MATLAB software (R2022a) write program convert waveform, and energy characteristics signals at certain time be obtained. By analyzing every event, microseism active areas determined, then predicted scientifically. This paper selected two different sites, were main powerhouse access powerhouse, as research background. Introducing HHT time–frequency conducted event dynamic spectrum scientifically comprehensively displayed signal reflected change laws local abrupt information. results indicated that some parameter anomalies For conditions, realize new idea single-channel rockbursts, very meaningful.