Assessment of the Excavation Damaged Zones in the Surrounding Rock of an Underground Powerhouse under High In Situ Stress Using an Acoustic Velocity Detecting Method

<div>Principle of acoustic velocity testing system, modified after Tao et al. [<a href="/journals/ace/2020/7297260/#B28">28</a>].</div>

Advances in Civil Engineering

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Figure 9

Figure 9: Assessment of the Excavation Damaged Zones in the Surrounding Rock of an Underground Powerhouse under High In Situ Stress Using an Acoustic Velocity Detecting Method 

Figure 9 | Assessment of the Excavation Damaged Zones in the Surrounding Rock of an Underground Powerhouse under High In Situ Stress Using an Acoustic Velocity Detecting Method 