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

<div>Spectrum diagram of coal rock fracture signal from February 21 to 24. (a) Fourier transform results of coal rock fracture. (b) S-transform results of coal rock fracture.</div>

Advances in Civil Engineering

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Figure 8

Figure 8: Study on the Key Technology of Controlling the Instability of Deep High-Stress Coal and Rock Mass and Relieving the Danger 