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>Distribution diagram of in situ stress measurement positions at the underground group cavern of Houziyan hydropower station (modified after Dong et al. [<a href="/journals/ace/2020/7297260/#B36">36</a>]).</div>

Advances in Civil Engineering

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Figure 5

Figure 5: 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 5 | 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 