Advances in Civil Engineering / 2020 / Article / Fig 12

Research Article

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 12

Four types of acoustic wave curves of the surrounding rock mass in the underground powerhouse of the Houziyan hydropower project: (a) type I (b) type II, (c) type III, and (d) type IV.

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