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>A typical geological cross-section of Houziyan hydropower station powerhouse along the center line of 2# omnibus bar cave (stake 0 + 51.3 m) (modified after Dong et al. [<a href="/journals/ace/2020/7297260/#B36">36</a>]).</div>

Advances in Civil Engineering

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Figure 4

Figure 4: 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 4 | 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 