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>Depths of EDZs distributed in typical measured sections of Houziyan hydropower project: (a) section 0 + 008.8 m and (b) section of 0 + 041.3 m.</div>

Advances in Civil Engineering

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Figure 15

Figure 15: 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 15 | 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 