Study on the Key Technology of Controlling the Instability of Deep High-Stress Coal and Rock Mass and Relieving the Danger

<div>Frequency spectrum characteristics of microseismic signals after hydrocavern building. (a) Fourier transform results of coal rock fracture. (b) S-transform results of coal rock fracture.</div>

Advances in Civil Engineering

fig9

Figure 9

Figure 9: Study on the Key Technology of Controlling the Instability of Deep High-Stress Coal and Rock Mass and Relieving the Danger 