Experimental Study on Deformation and Acoustic Emission Characteristics of Arch Roadway under Different Unloading Rates

<div>AE frequency-domain characteristics with slow unloading under 30 MPa. (a) Peak frequency-time-amplitude evolution process. (b) Peak frequency-time evolution process.</div>

Advances in Civil Engineering

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Figure 16

Figure 16: Experimental Study on Deformation and Acoustic Emission Characteristics of Arch Roadway under Different Unloading Rates 