Research Article
Study on Response Characteristics of Surrounding Rock Rupture Microseismic Events during Coal Roadway Excavation
Table 4
Time-frequency characteristics of different microseismic events.
| | Event category | Time-frequency characteristics | | Event | Duration L (ms) | Maximum amplitude A (mV) | The total energy of the wavelet packet | Dominant frequency f (Hz) |
| | Noise interference | Event 1 | 613 | 61.69 | 3.5136e + 09 | 57 | | Coal caving | Event 1 | 3104 | 4096 | 8.7179e + 09 | 171 | | Event 2 | 3074 | 4096 | 9.9744e + 09 | 232 | | Rock fracture | Event 1 | 3494 | 4096 | 1.2611e + 06 | 166 | | Event 2 | 2190 | 4086 | 1.4596e + 06 | 167 |
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